LM3411 [TI]

精密次级稳压器和驱动器;


型号：	LM3411
厂家：	TEXAS INSTRUMENTS
描述：	精密次级稳压器和驱动器驱动驱动器稳压器
文件：	总33页 (文件大小：1986K)
中文：	中文翻译
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LM3411

SNVS113F –DECEMBER 1999–REVISED MAY 2016

LM3411 Precision Secondary Regulator and Driver

1 Features

3 Description

The LM3411 is a low-power fixed-voltage (3.3 V or

5 V) precision shunt regulator designed specifically

for driving an optoisolator to provide feedback

isolation in a switching regulator.

•

Fixed Voltages of 3.3 V and 5 V With Initial

Tolerance of ±1% for Standard Grade and ±0.5%

for A Grade

•

Custom Voltages Available (3 V to 17 V)

Wide Output Current Range (20 μA to 15 mA)

Low Temperature Coefficient

The LM3411 circuitry includes an internally

compensated operational amplifier,

reference, NPN output transistor, and voltage setting

resistors.

bandgap

Available in 5-Pin SOT-23 Surface-Mount

Package (Tape and Reel)

trimmed precision bandgap reference with

temperature drift curvature correction provides a

ensured 1% precision over the operating temperature

range (A grade version). The inverting input of the

amplifier is externally accessible for loop frequency

compensation when used as part of a larger servo

system. The output is an open-emitter NPN transistor

capable of driving up to 15 mA of load current.

2 Applications

•

Secondary Controller for Isolated DC-DC PWM

Switching Regulators Systems

•

Use With LDO Regulator for High-Precision,

Fixed-Output Regulators

•

Precision Monitoring Applications

Because of its small die size, the LM3411 has been

made available in the subminiature 5-pin SOT-23

surface-mount package. This package is ideal for use

in space-critical applications.

Use With Many Types of Regulators to Increase

Precision and Improve Performance

Although its main application is to provide a precision

output voltage (no trimming required) and maintain

very good regulation in isolated DC-DC converters, it

can also be used with other types of voltage

regulators or power semiconductors to provide a

precision output voltage without precision resistors or

trimming.

Device Information⁽¹⁾

PART NUMBER

LM3411

PACKAGE

BODY SIZE (NOM)

SOT-23 (5)

2.90 mm × 1.60 mm

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

Typical Application Schematic

LM3411 Functional Diagram

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

LM3411

SNVS113F –DECEMBER 1999–REVISED MAY 2016

www.ti.com

Table of Contents

8.3 Feature Description................................................. 12

8.4 Device Functional Modes........................................ 12

Application and Implementation ........................ 13

9.1 Application Information............................................ 13

9.2 Typical Applications ................................................ 13

Features.................................................................. 1

Applications ........................................................... 1

Description ............................................................. 1

Revision History..................................................... 2

Pin Configuration and Functions......................... 3

Specifications......................................................... 4

6.1 Absolute Maximum Ratings ...................................... 4

6.2 ESD Ratings.............................................................. 4

6.3 Recommended Operating Conditions....................... 4

6.4 Thermal Information.................................................. 4

6.5 Electrical Characteristics: 3.3-V Version................... 5

6.6 Electrical Characteristics: 5-V Version...................... 6

6.7 Typical Characteristics.............................................. 7

Parameter Measurement Information .................. 9

Detailed Description ............................................ 11

8.1 Overview ................................................................. 11

8.2 Functional Block Diagrams ..................................... 11

10 Power Supply Recommendations ..................... 24

11 Layout................................................................... 24

11.1 Layout Guidelines ................................................. 24

11.2 Layout Example .................................................... 24

12 Device and Documentation Support ................. 25

12.1 Documentation Support ........................................ 25

12.2 Community Resources.......................................... 25

12.3 Trademarks........................................................... 25

12.4 Electrostatic Discharge Caution............................ 25

12.5 Glossary................................................................ 25

13 Mechanical, Packaging, and Orderable

Information ........................................................... 25

4 Revision History

NOTE: Page numbers for previous revisions may differ from page numbers in the current version.

Changes from Revision E (April 2013) to Revision F

Page

•

Added ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation

section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and

Mechanical, Packaging, and Orderable Information section .................................................................................................. 1

Changes from Revision D (April 2013) to Revision E

Page

•

Changed layout of National Semiconductor Data Sheet to TI format .................................................................................. 12

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SNVS113F –DECEMBER 1999–REVISED MAY 2016

5 Pin Configuration and Functions

DBV Package

5-Pin SOT-23

Top View

+IN

GND

–

OUT

COMP

Pin Functions

I/O

DESCRIPTION

NO.

NAME

+IN

Output measurement pin

Ground pin

GND

—

I/O

—

I/O

No internal connection, but must be soldered to printed-circuit board for best heat transfer.

Operational amplifier inverting input pin

COMP

OUT

Optocoupler drive pin

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SNVS113F –DECEMBER 1999–REVISED MAY 2016

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6 Specifications

6.1 Absolute Maximum Ratings

over operating free-air temperature range (unless otherwise noted)⁽¹⁾⁽²⁾

MIN

MAX

UNIT

Input voltage, V_IN

Output current

Power dissipation (T_A= 25°C)⁽³⁾

300

215

220

150

Vapor phase (60 s)

Lead temperature

Infrared (15 s)

°C

Junction temperature

°C

Storage temperature, T_stg

–65

(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings

only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended

Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

(2) See AN-450 Surface Mounting Methods and Their Effect on Product Reliability (SNOA742) for methods on soldering surface-mount

devices.

(3) The maximum power dissipation must be derated at elevated temperatures and is dictated by T_Jmax(maximum junction temperature),

R_θJA(junction to ambient thermal resistance), and T_A(ambient temperature). The maximum allowable power dissipation at any

temperature is (P_Dmax= T_Jmax– T_A) / R_θJAor the number given in the Absolute Maximum Ratings, whichever is lower. The typical

thermal resistance (R_θJA) when soldered to a printed-circuit board is approximately 306°C/W for the DBV package.

6.2 ESD Ratings

VALUE

UNIT

V_(ESD)

Electrostatic discharge

Human body model (HBM), per ANSI/ESDA/JEDEC JS-001⁽¹⁾

±1500

(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.

6.3 Recommended Operating Conditions

over operating free-air temperature range (unless otherwise noted)⁽¹⁾

MIN

NOM

3.3

MAX

UNIT

LM3411x 3.3-V

LM3411x 5-V

V_I

Input voltage

I_O

Output current

–40

°C

T_A

T_J

Ambient temperature

Operating junction temperature

125

°C

(1) The maximum power dissipation must be derated at elevated temperatures and is dictated by T_Jmax(maximum junction temperature),

_θJA(junction to ambient thermal resistance), and T_A(ambient temperature). The maximum allowable power dissipation at any

temperature is (P_Dmax= T_Jmax− T_A)/R_θJAor the number given in the Absolute Maximum Ratings, whichever is lower. The typical thermal

resistance (R_θJA) when soldered to a printed-circuit board is approximately 306°C/W for the DBV package.

6.4 Thermal Information

LM3411

THERMAL METRIC⁽¹⁾

DBV (SOT-23)

5 PINS

178.6

134.7

37.3

UNIT

R_θJA

Junction-to-ambient thermal resistance

°C/W

R_θJC(top)

R_θJB

Junction-to-case (top) thermal resistance

Junction-to-board thermal resistance

ψ_JT

Junction-to-top characterization parameter

Junction-to-board characterization parameter

Junction-to-case (bottom) thermal resistance

24.7

ψ_JB

36.8

R_θJC(bot)

—

(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application

report, SPRA953.

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6.5 Electrical Characteristics: 3.3-V Version

Specifications are for T_J= 25°C, V_IN= V_REG, and V_OUT= 1.5 V (unless otherwise noted).

PARAMETER

TEST CONDITIONS

MIN⁽¹⁾

3.284

3.267

3.234

TYP⁽²⁾

MAX⁽¹⁾

3.317

3.333

3.366

±0.5%

±1%

UNIT

T_J= 25°C

3.3

LM3411A 3.3-V

LM3411 3.3-V

LM3411A 3.3-V

LM3411 3.3-V

LM3411A 3.3-V

LM3411 3.3-V

LM3411A 3.3-V

LM3411 3.3-V

LM3411A 3.3-V

LM3411 3.3-V

–40°C ≤ T_J≤ 125°C

T_J= 25°C

Regulation voltage I_OUT= 5 mA

3.3

–40°C ≤ T_J≤ 125°C

T_J= 25°C

V_REG

–40°C ≤ T_J≤ 125°C

T_J= 25°C

Regulation voltage

I_OUT= 5 mA

tolerance

±1%

–40°C ≤ T_J≤ 125°C

T_J= 25°C

±2%

3.3

110

–40°C ≤ T_J≤ 125°C

T_J= 25°C

115

I_q

Quiescent current I_OUT= 5 mA

μA

125

–40°C ≤ T_J≤ 125°C

T_J= 25°C

150

1.5

0.75

–40°C ≤ T_J≤ 125°C

T_J= 25°C

20 μA ≤ I_OUT≤ 1 mA

–40°C ≤ T_J≤ 125°C

T_J= 25°C

0.5

3.3

Transconductance

ΔI_OUT/ΔV_REG

G_m

mA/mV

–40°C ≤ T_J≤ 125°C

T_J= 25°C

1 mA ≤ I_OUT≤ 15 mA

2.5

1.7

–40°C ≤ T_J≤ 125°C

T_J= 25°C,

1 V ≤ V_OUT≤ V_REG– 1.2 V

550

250

1000

3500

LM3411A 3.3-V

LM3411 3.3-V

LM3411A 3.3-V

LM3411 3.3-V

−40°C ≤ T_J≤ 125°C,

1 V ≤ V_OUT≤ V_REG– 1.3 V

R_L= 140 Ω⁽³⁾

T_J= 25°C,

1 V ≤ V_OUT≤ V_REG– 1.2 V

450

−40°C ≤ T_J≤ 125°C,

1 V ≤ V_OUT≤ V_REG– 1.3 V

200

Voltage gain

ΔV_OUT/ΔV_REG

A_V

V/V

T_J= 25°C,

1 V ≤ V_OUT≤ V_REG– 1.2 V

1500

900

−40°C ≤ T_J≤ 125°C,

1 V ≤ V_OUT≤ V_REG– 1.3 V

R_L= 2 kΩ

T_J= 25°C,

1 V ≤ V_OUT≤ V_REG– 1.2 V

1000

700

−40°C ≤ T_J≤ 125°C,

1 V ≤ V_OUT≤ V_REG– 1.3 V

T_J= 25°C

1.2

1.3

1.2

1.3

0.5

LM3411A 3.3-V

LM3411 3.3-V

LM3411A 3.3-V

LM3411 3.3-V

–40°C ≤ T_J≤ 125°C

T_J= 25°C

Output

V_IN= V_REG+ 100 mV,

I_OUT= 15 mA

V_SAT

saturation⁽⁴⁾

–40°C ≤ T_J≤ 125°C

T_J= 25°C

0.1

–40°C ≤ T_J≤ 125°C

T_J= 25°C

Output leakage

current

V_IN= V_REG– 100 mV,

V_OUT= 0 V

I_L

μA

0.5

–40°C ≤ T_J≤ 125°C

LM3411A 3.3-V

LM3411 3.3-V

Internal feedback

resistor

R_f

kΩ

Output noise

voltage

E_n

I_OUT= 1 mA, 10 Hz ≤ f ≤ 10 kHz

μV_RMS

(1) Limits are 100% production tested at 25°C. Limits over the operating temperature range are ensured through correlation using Statistical

Quality Control (SQC) methods. The limits are used to calculate TIs Averaging Outgoing Level (AOQL).

(2) Typical numbers are at 25°C and represent the most likely parametric norm.

(3) Actual test is done using equivalent current sink instead of a resistor load.

(4) V_SAT= V_IN– V_OUT, when the voltage at the IN pin is forced 100 mV above the nominal regulating voltage (V_REG).

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6.6 Electrical Characteristics: 5-V Version

Specifications are for T_J= 25°C, V_IN= V_REG, and V_OUT= 1.5 V (unless otherwise noted).

PARAMETER

TEST CONDITIONS

MIN⁽¹⁾

4.975

4.95

4.9

TYP⁽²⁾

MAX⁽¹⁾

5.025

5.05

5.1

UNIT

T_J= 25°C

LM3411A 5-V

LM3411 5-V

LM3411A 5-V

LM3411 5-V

LM3411A 5-V

LM3411 5-V

LM3411A 5-V

LM3411 5-V

LM3411A 5-V

LM3411 5-V

–40°C ≤ T_J≤ 125°C

T_J= 25°C

Regulation voltage I_OUT= 5 mA

–40°C ≤ T_J≤ 125°C

T_J= 25°C

V_REG

±0.5%

±1%

±2%

110

–40°C ≤ T_J≤ 125°C

T_J= 25°C

Regulation voltage

I_OUT= 5 mA

tolerance

–40°C ≤ T_J≤ 125°C

T_J= 25°C

3.3

–40°C ≤ T_J≤ 125°C

T_J= 25°C

115

I_q

Quiescent current I_OUT= 5 mA

μA

125

–40°C ≤ T_J≤ 125°C

T_J= 25°C

150

1.5

0.75

–40°C ≤ T_J≤ 125°C

T_J= 25°C

20 μA ≤ I_OUT≤ 1 mA

–40°C ≤ T_J≤ 125°C

T_J= 25°C

0.5

3.3

Transconductance

ΔI_OUT/ΔV_REG

G_m

mA/mV

–40°C ≤ T_J≤ 125°C

T_J= 25°C

1 mA ≤ I_OUT≤ 15 mA

2.5

1.7

–40°C ≤ T_J≤ 125°C

T_J= 25°C,

1 V ≤ V_OUT≤ V_REG– 1.2 V

750

350

1000

3500

LM3411A 5-V

LM3411 5-V

LM3411A 5-V

LM3411 5-V

−40°C ≤ T_J≤ 125°C,

1 V ≤ V_OUT≤ V_REG– 1.3 V

R_L= 250 Ω⁽³⁾

T_J= 25°C,

1 V ≤ V_OUT≤ V_REG– 1.2 V

650

−40°C ≤ T_J≤ 125°C,

1 V ≤ V_OUT≤ V_REG– 1.3 V

300

Voltage gain

ΔV_OUT/ΔV_REG

A_V

V/V

T_J= 25°C,

1 V ≤ V_OUT≤ V_REG– 1.2 V

1500

900

−40°C ≤ T_J≤ 125°C,

1 V ≤ V_OUT≤ V_REG– 1.3 V

R_L= 2 kΩ

T_J= 25°C,

1 V ≤ V_OUT≤ V_REG– 1.2 V

1000

700

−40°C ≤ T_J≤ 125°C,

1 V ≤ V_OUT≤ V_REG– 1.3 V

T_J= 25°C

1.2

1.3

1.2

1.3

0.5

LM3411A 5-V

LM3411 5-V

LM3411A 5-V

LM3411 5-V

–40°C ≤ T_J≤ 125°C

T_J= 25°C

Output

V_IN= V_REG+ 100 mV,

I_OUT= 15 mA

V_SAT

saturation⁽⁴⁾

–40°C ≤ T_J≤ 125°C

T_J= 25°C

0.1

–40°C ≤ T_J≤ 125°C

T_J= 25°C

Output leakage

current

V_IN= V_REG– 100 mV,

V_OUT= 0 V

I_L

μA

0.5

–40°C ≤ T_J≤ 125°C

LM3411A 5-V

LM3411 5-V

118

Internal feedback

resistor

R_f

kΩ

Output noise

voltage

E_n

I_OUT= 1 mA, 10 Hz ≤ f ≤ 10 kHz

μV_RMS

(1) Limits are 100% production tested at 25°C. Limits over the operating temperature range are ensured through correlation using Statistical

Quality Control (SQC) methods. The limits are used to calculate TIs Averaging Outgoing Level (AOQL).

(2) Typical numbers are at 25°C and represent the most likely parametric norm.

(3) Actual test is done using equivalent current sink instead of a resistor load.

(4) V_SAT= V_IN– V_OUT, when the voltage at the IN pin is forced 100 mV above the nominal regulating voltage (V_REG).

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SNVS113F –DECEMBER 1999–REVISED MAY 2016

6.7 Typical Characteristics

Figure 1. Normalized Temperature Drift

Figure 2. Quiescent Current

Figure 3. Output Saturation Voltage, V_SAT

Figure 4. Bode Plot

Figure 5. Bode Plot

Figure 6. Bode Plot

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Typical Characteristics (continued)

Figure 7. Response Time for 3.3-V Version (C_C= 0 pF)

Figure 9. Response Time for 5-V Version (C_C= 0 pF)

Figure 8. Response Time for 3.3-V Version (C_C= 10 nF)

Figure 10. Response Time for 5-V Version (C_C= 10 nF)

Figure 11. Tempco of Internal Feedback Resistor (Rf)

Figure 12. Regulation Voltage Change vs Output Current

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Typical Characteristics (continued)

Figure 13. Regulation Voltage vs Output Voltage

and Load Resistance

Figure 14. Regulation Voltage vs Output Voltage

and Load Resistance

7 Parameter Measurement Information

Figure 15. Circuit Used for Bode Plots

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Parameter Measurement Information (continued)

Figure 16. Circuit Used for Response Time

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SNVS113F –DECEMBER 1999–REVISED MAY 2016

8 Detailed Description

8.1 Overview

The LM3411 is a shunt regulator specifically designed to be the reference and control section in an overall

feedback loop of a regulated power supply. The regulated output voltage is sensed between the IN pin and

GROUND pin of the LM3411. If the voltage at the IN pin is less than the LM3411 regulating voltage (V_REG), the

OUT pin sources no current. As the voltage at the IN pin approaches the V_REGvoltage, the OUT pin begins

sourcing current. This current is then used to drive a feedback device, (optocoupler) or a power device (linear

regulator, switching regulator, and so forth) which serves the output voltage to be the same value as V_REG

In some applications (even under normal operating conditions), the voltage on the IN pin can be forced above

the V_REGvoltage. In these instances, the maximum voltage applied to the IN pin should not exceed 20 V. In

addition, an external resistor may be required on the OUT pin to limit the maximum current to 20 mA.

8.2 Functional Block Diagrams

Figure 17. LM3411 Functional Diagram

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Functional Block Diagrams (continued)

Figure 18. Detailed Schematic

8.3 Feature Description

The LM3411 devices contain an internal operational amplifier, precision reference, feedback resister divider, and

a bi-polar transistor suitable for driving an optocoupler. The divider resistor is sized such that the system will

regulate the +IN pin to either 3.3 V or 5 V depending on the device version used. By connecting a feedback

network from the OUT pin to the COMP pin, local compensation is implemented to stabilize the system.

8.4 Device Functional Modes

The primary mode of operation for the LM3411 is as a shunt regulator. In addition the device has robust

overcurrent protection. These features make it applicable to a wide range of applications ranging from isolated

feedback control to traditional shunt regulation.

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9 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

9.1 Application Information

The LM3411 is a high-efficiency shunt regulator optimized for driving an opto-coupler in an isolated feedback

system. This enables accurate regulation of the output voltage as well as convenient drive to the opto-coupler in

a small SOT-23 package. In addition to isolated feedback systems the LM3411 is also applicable to a wide

variety of linear regulator applications.

9.2 Typical Applications

9.2.1 LM3411 Typical Application

Figure 19 shows a typical use case for the LM3411. Here, the device is used as a precision shunt regulator to

control the output voltage of a switching power supply. The LM3411 provides the functionality necessary to drive

the external opto-coupler, an on-board reference necessary for precision control of the DC output voltage, and an

on-board operational amplifier for providing the necessary compensation to optimize the transient performance of

the system.

Figure 19. LM3411 Typical Application Schematic

9.2.1.1 Design Requirements

The following sections provide a variety of application level design examples. See the following for the basic

requirements.

● Isolated flyback converter example is 5 V with 250 mA.

● Isolated flyback converter example is 3.3 V or 5 V with 1.5 A.

● Buck converter example is 5 V with 1 A.

● Flyback converter example is V_IN= –20 V to –10 V and V_OUT= –5 V with 1 A.

● Low dropout linear regulator example is 5 V with 1 A.

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Typical Applications (continued)

● Low dropout linear regulator example is 3.3 V and 0.5 A.

● Precision positive voltage regulator with accurate current limit is V_IN= 9 V to 20 V and V_OUT= 5 V.

● Negative voltage regulator example is V_IN= –8 V to –20 V and V_OUT= –5 V.

● 250-mA shunt regulator example is V_OUT= 5 V.

9.2.1.2 Detailed Design Procedure

9.2.1.2.1 Compensation

The inverting input of the error amplifier is brought out to allow overall closed-loop compensation. In many of the

applications circuits shown in the subsequent sections, compensation is provided by a single capacitor

connected from the compensation pin to the out pin of the LM3411. The capacitor values shown in the

schematics accompanying these sections are adequate under most conditions, but they can be increased or

decreased depending on the desired loop response. Applying a load pulse to the output of a regulator circuit and

observing the resultant output voltage response is a easy method of determining the stability of the control loop.

Analyzing more complex feedback loops requires additional information.

The formula for AC gain at a frequency (f) as in Equation 1.

Z_f(f)

Gain (f) = 1+

R_f

where Z_f(f) =

jì 2pì f ìC

where

•

R_f≈ 52 kΩ for the 3.3-V part

R_f≈ 94 kΩ for the 5-V part

(1)

The resistor (R_f) in the formula is an internal resistor located on the die. Since this resistor value will affect the

phase margin, the worst case maximum and minimum values are important when analyzing closed loop stability.

The minimum and maximum room temperature values of this resistor are specified in Electrical Characteristics:

3.3-V Version of this data sheet, and Figure 11 shows the temperature coefficient from Typical Characteristics. In

the applications shown in the subsequent sections, the worst case phase margin occurs with minimum values of

R_f.

9.2.1.2.2 Test Circuit

The test circuit shown in Figure 20 can be used to measure and verify various LM3411 parameters. Test

conditions are set by forcing the appropriate voltage at the V_OUTSet test point and selecting the appropriate R_L

or I_OUTas specified in Electrical Characteristics. Use a DVM at the measure test points to read the data.

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Typical Applications (continued)

Figure 20. LM3411 Test Circuit

9.2.1.3 Application Curves

Figure 21. Regulation Voltage vs Output Voltage

Figure 22. Regulation Voltage vs Output Voltage

and Load Resistance

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Typical Applications (continued)

9.2.2 Isolated 250-mA Flyback Switching Regulator

Figure 23. Isolated 250-mA Flyback Switching Regulator Schematic

9.2.2.1 Design Requirements

The design requirements for this isolated flyback converter example are 5 V with 250 mA.

9.2.2.2 Detailed Design Procedure

The LM3411 regulator or driver provides the reference and feedback drive functions in a regulated power supply.

It can also be used together with many different types of regulators, (both linear and switching) as well as other

power semiconductor devices to add precision and improve regulation specifications. Output voltage tolerances

better than 0.5% are possible without using trim pots or precision resistors.

One of the main applications of the LM3411 is to drive an opto-isolator to provide feedback signal isolation in a

switching regulator circuit. For low current applications (up to 250 mA), see Figure 23 for a circuit that provides

good regulation and complete input and output electrical isolation.

For an input voltage of 15 V, this circuit can provide an output of either 3.3 V or 5 V with a load current up to

250 mA with excellent regulation characteristics. With the part values shown, this circuit operates at 80 kHz, and

can be synchronized to a clock or an additional LM3578. See LM3578A's data sheet (SNVS767) for additional

information.

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Typical Applications (continued)

9.2.3 Isolated 1.5-A Flyback Switching Regulator

Figure 24. Isolated 1.5-A Flyback Switching Regulator Using a LM2577

9.2.3.1 Design Requirements

The design requirements for this isolated flyback converter example are 3.3 V or 5 V with 1.5 A.

9.2.3.2 Detailed Design Procedure

An isolated DC-DC flyback converter capable of higher output current is shown in Figure 24. This circuit uses the

LM2577 SIMPLE SWITCHER voltage regulator for the Pulse Width Modulation (PWM), power switch, and

protection functions, while the LM3411 provides the voltage reference, gain, and opto-coupler drive functions. In

this circuit, the reference and error amplifier in the LM2577 are not used (note that the feedback pin is grounded).

The gain is provided by the LM3411. Since the voltage reference is located on the secondary side of the

transformer, this circuit provides very good regulation specifications.

The output of a switching regulator typically will contain a small ripple voltage at the switching frequency and may

also contain voltage transients. These transient voltage spikes can be sensed by the LM3411 and could give an

incorrect regulation voltage. An RC filter consisting of a 1-Ω resistor and a 100-nF capacitor will filter these

transients and minimize this problem. The 1-Ω resistor should be located on the ground side of the LM3411, and

the capacitor should be physically located near the package.

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Typical Applications (continued)

9.2.4 Precision 1-A Buck Regulator

Figure 25. Precision 1-A Buck Regulator Schematic

9.2.4.1 Design Requirements

The design requirements for this precision buck converter example are 5 V with 1 A.

9.2.4.2 Detailed Design Procedure

Improved output voltage tolerance and regulation specifications are possible by combining the LM3411A with one

of the SIMPLE SWITCHER buck regulator IC's, such as the LM2574, LM2575, or LM2576. Figure 25 shows a

circuit capable of providing a 5-V, ±0.5% output (1% over the operating temperature range) without using any

trim-pots or precision resistors. Typical line regulation numbers are a 1 mV change on the output for a 8 V to

18 V change on the input, and load regulation of 1 mV with a load change from 100 mA to 1 A.

9.2.5 Negative Input, Negative or Positive Output Flyback Regulator

Figure 26. Negative Input, Negative or Positive Output Flyback Regulator Schematic

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Typical Applications (continued)

9.2.5.1 Design Requirements

The design requirements for this flyback converter example are V_IN= –20 V to –10 V and V_OUT= –5 V with 1 A.

9.2.5.2 Detailed Design Procedure

A DC-DC flyback converter that accepts a negative input voltage, and delivers either a positive or negative output

is shown in Figure 26. The circuit uses a buck regulator (such as the LM2574, LM2575, or LM2576, depending

on how much output current is needed) operating in a flyback configuration. The LM3411 provides the reference

and the required level shifting circuitry needed to make the circuit work correctly.

A unique feature of this circuit is the ability to ground either the high or low side of the output, thus generating

either a negative or a positive output voltage. Although no isolation is provided, with the addition of an opto-

isolator and related components, this circuit could provide input/output isolation.

Combining a LM3411A 5-V version with a 1-A low dropout linear regulator results in a 5 V ±0.5% (1% over the

operating temperature range) regulator with excellent regulation specifications, with no trimming or 1% resistors

needed.

An added benefit of this circuit (and also true of many of the other circuits shown) is the high-side and low-side

remote output voltage sensing feature. Sensing the output voltage at the load eliminates the voltage drops

associated with wire resistance, thus providing near perfect load regulation.

9.2.6 Precision 5-V, 1-A Low Dropout Regulator

Figure 27. Precision 5-V, 1-A Low Dropout Regulator

9.2.6.1 Design Requirements

The design requirements for this precision low dropout linear regulator example are 5 V with 1 A.

9.2.6.2 Detailed Design Procedure

Figure 27 shows a 5-V, 1-A regulator circuit featuring low dropout, very good regulation specifications, self-

protection features, and allows output voltage sensing. The regulator used is a LM2941 adjustable low dropout

positive regulator, which also features an ON/OFF pin to provide a shutdown feature.

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Typical Applications (continued)

9.2.7 3.3-V, 0.5-A Low Dropout Regulator

Figure 28. 3.3-V, 0.5-A Low Dropout Regulator Schematic

9.2.7.1 Design Requirements

The design requirements for this low dropout linear regulator example are 3.3 V and 0.5 A.

9.2.7.2 Detailed Design Procedure

The circuit in Figure 28 shows a 3.3-V low dropout regulator using the LM3411-3.3 and several discrete

components. This circuit is capable of excellent performance with both the dropout voltage and the ground pin

current specifications improved over the LM2941 and LM3411 circuit.

9.2.8 Precision Positive Voltage Regulator With Accurate Current Limit

Figure 29. Precision Positive Voltage Regulator With Accurate Current Limit Schematic

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Typical Applications (continued)

9.2.8.1 Design Requirements

The design requirements for this precision positive voltage regulator with accurate current limit are V_IN= 9 V to

20 V and V_OUT= 5 V.

9.2.8.2 Detailed Design Procedure

The standard LM317 three terminal adjustable regulator circuit can greatly benefit by adding a LM3411.

Performance is increased and features are added. Figure 29 shows a circuit capable of providing further

improved line and load regulation, lower temperature drift, and full remote output voltage sensing on both the

high and low side. In addition, a precise current limit or constant current feature is simple to add.

Current limit protection in most IC regulators is mainly to protect the IC from gross overcurrent conditions which

could otherwise fuse bonding wires or blow IC metalization, therefore not much precision is needed for the actual

current limit values. Current limit tolerances can sometimes vary from ±10% to as high as +300% over

manufacturing and temperature variations. Often critical circuitry requires a much tighter control over the amount

of current the power supply can deliver. For example, a power supply may be needed that can deliver 100% of

its design current, but can still limit the maximum current to 110% to protect critical circuitry from high current

fault conditions.

The circuit in Figure 29 can provide a current limit accuracy that is better than ±4%, over all possible variations,

in addition to having excellent line, load, and temperature specifications.

9.2.9 Precision Negative Voltage Regulator

Figure 30. Precision Negative Voltage Regulator Schematic

Figure 31. Precision Negative Voltage Regulator With Accurate Current Limit

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Typical Applications (continued)

9.2.9.1 Design Requirements

The design requirements for this negative voltage regulator example are V_IN= –8 V to –20 V and V_OUT= –5 V.

9.2.9.2 Detailed Design Procedure

Like the positive regulators, the performance of negative adjustable regulators can also be improved by adding

the LM3411. Output voltages of either 3.3 V or 5 V at currents up to 1.5 A (3 A when using a LM333) are

possible. Adding two resistors to the circuit in Figure 30 adds the precision current limit feature as shown in

Figure 31. Current limit tolerances of ±4% over manufacturing and temperature variations are possible with this

circuit.

9.2.10 4.7-V Power ON Detector With Hysteresis

Figure 32. 4.7-V Power ON Detector With Hysteresis Schematic

9.2.10.1 Detailed Design Procedure

Figure 32 shows a simple 5-V supply monitor circuit. Using the LM3411's voltage reference, operational amplifier

(as a comparator) and output driver, this circuit provides a LED indication of the presence of the 5-V supply.

9.2.11 ±50-mV External Trim

Figure 33. ±50-mV External Trim Schematic

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Typical Applications (continued)

9.2.11.1 Detailed Design Procedure

The LM3411 initial room temperature tolerance is ±1% and ±0.5% for the A grade part. If a tighter tolerance is

needed, see Figure 33 for a trim scheme that provides approximately ±1% adjustment range of the regulation

voltage (V_REG).

9.2.12 250-mA Shunt Regulator

Figure 34. 250-mA Shunt Regulator Schematic

9.2.12.1 Design Requirements

The design requirement for this 250-mA shunt regulator example is V_OUT= 5 V.

9.2.12.2 Detailed Design Procedure

The LM3411 is ensured to drive a 15 mA load, but if more current is needed, a NPN boost transistor can be

added. Figure 34 shows a shunt regulator capable of providing excellent regulation over a very wide range of

current.

9.2.13 Voltage Detector

Figure 35. Voltage Detector Schematic

9.2.13.1 Detailed Design Procedure

Perhaps one of the simplest applications for the LM3411 is the voltage detector circuit shown in Figure 35. The

OUT pin is low when the input voltage is less than V_REG. When the V_INpin rises above V_REG, the OUT pin is

pulled high by the internal NPN output resistor.

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Typical Applications (continued)

9.2.14 Overvoltage Crowbar

Figure 36. Overvoltage Crowbar Schematic

9.2.14.1 Detailed Design Procedure

Also an overvoltage detector, the crowbar circuit shown in Figure 36 is normally located at the output of a power

supply to protect the load from an overvoltage condition should the power supply fail with an input/output short.

10 Power Supply Recommendations

The output of a switching regulator typically will contain a small ripple voltage at the switching frequency and may

also contain voltage transients. These transient voltage spikes can be sensed by the LM3411 and could give an

incorrect regulation voltage. An RC filter consisting of a 1-Ω resistor and a 100-nF capacitor will filter these

transients and minimize this problem.

11 Layout

11.1 Layout Guidelines

The 1-Ω resistor should be located on the ground side of the LM3411, and the 100-nF capacitor should be

physically located near the package.

11.2 Layout Example

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hÜÇ

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ground plꢂne

Dbꢀ

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/onnecꢁ ꢁo

hpꢁocoupler

Figure 37. LM3411 Layout Schematic

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SNVS113F –DECEMBER 1999–REVISED MAY 2016

12 Device and Documentation Support

12.1 Documentation Support

12.1.1 Related Documentation

For related documentation see the following:

•

AN-450 Surface Mounting Methods and Their Effect on Product Reliability, SNOA742

AN-1095 Design of Isolated Converters Using Simple Switchers, SNVA005

AN-1305 LM5030 Evaluation Board, SNVA078

Versatility of the LM5030 PWM Push-Pull Controller, SNVA548

LM2578A/LM3578A Switching Regulator, SNVS767

12.2 Community Resources

The following links connect to TI community resources. Linked contents are provided "AS IS" by the respective

contributors. They do not constitute TI specifications and do not necessarily reflect TI's views; see TI's Terms of

Use.

TI E2E™ Online Community TI's Engineer-to-Engineer (E2E) Community. Created to foster collaboration

among engineers. At e2e.ti.com, you can ask questions, share knowledge, explore ideas and help

solve problems with fellow engineers.

Design Support TI's Design Support Quickly find helpful E2E forums along with design support tools and

contact information for technical support.

12.3 Trademarks

E2E is a trademark of Texas Instruments.

All other trademarks are the property of their respective owners.

12.4 Electrostatic Discharge Caution

These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam

during storage or handling to prevent electrostatic damage to the MOS gates.

12.5 Glossary

SLYZ022 — TI Glossary.

This glossary lists and explains terms, acronyms, and definitions.

13 Mechanical, Packaging, and Orderable Information

The following pages include mechanical, packaging, and orderable information. This information is the most

current data available for the designated devices. This data is subject to change without notice and revision of

this document. For browser-based versions of this data sheet, refer to the left-hand navigation.

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PACKAGE OPTION ADDENDUM

www.ti.com

10-Dec-2020

PACKAGING INFORMATION

Orderable Device

Status Package Type Package Pins Package

Eco Plan

Lead finish/

Ball material

MSL Peak Temp

Op Temp (°C)

Device Marking

Samples

Drawing

Qty

(1)

(2)

(3)

(4/5)

(6)

LM3411AM5-3.3/NOPB

LM3411AM5-5.0/NOPB

LM3411AM5X-5.0/NOPB

LM3411M5-3.3/NOPB

LM3411M5-5.0/NOPB

LM3411M5X-3.3/NOPB

LM3411M5X-5.0/NOPB

ACTIVE

SOT-23

DBV

1000 RoHS & Green

3000 RoHS & Green

1000 RoHS & Green

3000 RoHS & Green

Level-1-260C-UNLIM

-40 to 85

D00A

D01A

D00B

D01B

D00B

D01B

⁽¹⁾The marketing status values are defined as follows:

ACTIVE: Product device recommended for new designs.

LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.

NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.

PREVIEW: Device has been announced but is not in production. Samples may or may not be available.

OBSOLETE: TI has discontinued the production of the device.

⁽²⁾RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance

do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may

reference these types of products as "Pb-Free".

RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.

Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of <=1000ppm threshold. Antimony trioxide based

flame retardants must also meet the <=1000ppm threshold requirement.

⁽³⁾MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.

⁽⁴⁾There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.

⁽⁵⁾Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation

of the previous line and the two combined represent the entire Device Marking for that device.

Addendum-Page 1

PACKAGE OPTION ADDENDUM

www.ti.com

10-Dec-2020

(6)

Lead finish/Ball material - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead finish/Ball material values may wrap to two

lines if the finish value exceeds the maximum column width.

Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information

provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and

continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.

TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.

In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.

Addendum-Page 2

PACKAGE MATERIALS INFORMATION

www.ti.com

9-Aug-2022

TAPE AND REEL INFORMATION

REEL DIMENSIONS

TAPE DIMENSIONS

Reel

Diameter

Cavity

A0 Dimension designed to accommodate the component width

B0 Dimension designed to accommodate the component length

K0 Dimension designed to accommodate the component thickness

Overall width of the carrier tape

P1 Pitch between successive cavity centers

Reel Width (W1)

QUADRANT ASSIGNMENTS FOR PIN 1 ORIENTATION IN TAPE

Sprocket Holes

Q1 Q2

Q3 Q4

Q1 Q2

Q3 Q4

User Direction of Feed

Pocket Quadrants

*All dimensions are nominal

Device

Package Package Pins

Type Drawing

SPQ

Reel

Pin1

Diameter Width (mm) (mm) (mm) (mm) (mm) Quadrant

(mm) W1 (mm)

LM3411AM5-3.3/NOPB SOT-23

LM3411AM5-5.0/NOPB SOT-23

LM3411AM5X-5.0/NOPB SOT-23

DBV

1000

3000

1000

3000

178.0

8.4

3.2

1.4

4.0

8.0

LM3411M5-3.3/NOPB

LM3411M5-5.0/NOPB

SOT-23

LM3411M5X-3.3/NOPB SOT-23

LM3411M5X-5.0/NOPB SOT-23

Pack Materials-Page 1

PACKAGE MATERIALS INFORMATION

www.ti.com

9-Aug-2022

TAPE AND REEL BOX DIMENSIONS

Width (mm)

*All dimensions are nominal

Device

Package Type Package Drawing Pins

SPQ

Length (mm) Width (mm) Height (mm)

LM3411AM5-3.3/NOPB

LM3411AM5-5.0/NOPB

LM3411AM5X-5.0/NOPB

LM3411M5-3.3/NOPB

LM3411M5-5.0/NOPB

LM3411M5X-3.3/NOPB

LM3411M5X-5.0/NOPB

SOT-23

DBV

1000

3000

1000

3000

208.0

191.0

35.0

Pack Materials-Page 2

PACKAGE OUTLINE

DBV0005A

SOT-23 - 1.45 mm max height

SMALL OUTLINE TRANSISTOR

3.0

2.6

0.1 C

1.75

1.45

0.90

PIN 1

INDEX AREA

(0.1)

2X 0.95

1.9

3.05

2.75

1.9

(0.15)

0.5

0.3

0.15

0.00

(1.1)

TYP

0.2

C A B

NOTE 5

0.25

GAGE PLANE

0.22

0.08

TYP

0.6

0.3

TYP

SEATING PLANE

4214839/G 03/2023

NOTES:

1. All linear dimensions are in millimeters. Any dimensions in parenthesis are for reference only. Dimensioning and tolerancing

per ASME Y14.5M.

2. This drawing is subject to change without notice.

3. Refernce JEDEC MO-178.

4. Body dimensions do not include mold flash, protrusions, or gate burrs. Mold flash, protrusions, or gate burrs shall not

exceed 0.25 mm per side.

5. Support pin may differ or may not be present.

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EXAMPLE BOARD LAYOUT

DBV0005A

SOT-23 - 1.45 mm max height

SMALL OUTLINE TRANSISTOR

PKG

5X (1.1)

5X (0.6)

SYMM

(1.9)

2X (0.95)

(R0.05) TYP

(2.6)

LAND PATTERN EXAMPLE

EXPOSED METAL SHOWN

SCALE:15X

SOLDER MASK

OPENING

SOLDER MASK

OPENING

METAL UNDER

SOLDER MASK

METAL

EXPOSED METAL

0.07 MIN

ARROUND

0.07 MAX

ARROUND

NON SOLDER MASK

DEFINED

SOLDER MASK

DEFINED

(PREFERRED)

SOLDER MASK DETAILS

4214839/G 03/2023

NOTES: (continued)

6. Publication IPC-7351 may have alternate designs.

7. Solder mask tolerances between and around signal pads can vary based on board fabrication site.

www.ti.com

EXAMPLE STENCIL DESIGN

DBV0005A

SOT-23 - 1.45 mm max height

SMALL OUTLINE TRANSISTOR

PKG

5X (1.1)

5X (0.6)

SYMM

(1.9)

2X(0.95)

(R0.05) TYP

(2.6)

SOLDER PASTE EXAMPLE

BASED ON 0.125 mm THICK STENCIL

SCALE:15X

4214839/G 03/2023

NOTES: (continued)

8. Laser cutting apertures with trapezoidal walls and rounded corners may offer better paste release. IPC-7525 may have alternate

design recommendations.

9. Board assembly site may have different recommendations for stencil design.

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TI PROVIDES TECHNICAL AND RELIABILITY DATA (INCLUDING DATA SHEETS), DESIGN RESOURCES (INCLUDING REFERENCE

DESIGNS), APPLICATION OR OTHER DESIGN ADVICE, WEB TOOLS, SAFETY INFORMATION, AND OTHER RESOURCES “AS IS”

AND WITH ALL FAULTS, AND DISCLAIMS ALL WARRANTIES, EXPRESS AND IMPLIED, INCLUDING WITHOUT LIMITATION ANY

IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT OF THIRD

PARTY INTELLECTUAL PROPERTY RIGHTS.

These resources are intended for skilled developers designing with TI products. You are solely responsible for (1) selecting the appropriate

TI products for your application, (2) designing, validating and testing your application, and (3) ensuring your application meets applicable

standards, and any other safety, security, regulatory or other requirements.

These resources are subject to change without notice. TI grants you permission to use these resources only for development of an

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is granted to any other TI intellectual property right or to any third party intellectual property right. TI disclaims responsibility for, and you

will fully indemnify TI and its representatives against, any claims, damages, costs, losses, and liabilities arising out of your use of these

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TI objects to and rejects any additional or different terms you may have proposed. IMPORTANT NOTICE

Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265

LM3411 [TI]

相关型号：

LM3411AM5-3.3

LM3411AM5-3.3/NOPB

LM3411AM5-3.3/NOPB

LM3411AM5-5.0

LM3411AM5-5.0/NOPB

LM3411AM5-5.0/NOPB

LM3411AM5X-3.3

LM3411AM5X-3.3/NOPB

LM3411AM5X-5.0

LM3411AM5X-5.0/NOPB

LM3411AM5X-5.0/NOPB

LM3411AN-3.3