LM317MX [STMICROELECTRONICS]

MEDIUM CURRENT 1.2 TO 37V ADJUSTABLE VOLTAGE REGULATOR; 中等电流1.2至37V可调稳压


型号：	LM317MX
厂家：	ST
描述：	MEDIUM CURRENT 1.2 TO 37V ADJUSTABLE VOLTAGE REGULATOR 中等电流1.2至37V可调稳压
文件：	总11页 (文件大小：117K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

LM217M

LM317M

MEDIUM CURRENT

1.2 TO 37V ADJUSTABLE VOLTAGE REGULATOR

■

OUTPUT VOLTAGE RANGE : 1.2 TO 37V

OUTPUT CURRENT IN EXCESS OF 500 mA

LINE REGULATION TYP. 0.01%

LOAD REGULATIONTYP. 0.1%

THERMAL OVERLOAD PROTECTION

SHORT CIRCUIT PROTECTION

OUTPUT TRANSISTOR SAFE AREA

COMPENSATION

■

FLOATING OPERATION FOR HIGH

VOLTAGE APPLICATIONS

TO-220

DPAK

TO-252

DESCRIPTION

The LM217M/LM317M are monolithic integrated

circuits in TO-220, DPAK, SOT-82 and SOT-194

packages intended for use as positive adjustable

voltage regulators.

They are designed to supply until 500 mA of load

current with an output voltage adjustable over a

1.2 to 37V range.

The nominal output voltage is selected by means

of only a resistive divider, making the device

exceptionally easy to use and eliminating the

stocking of many fixed regulators.

SOT-82

SOT-194

SCHEMATIC DIAGRAM

1/11

September 1997

LM217M/LM317M

ABSOLUTE MAXIMUM RATINGS

Symbol

Parameter

Value

Unit

V_i- V_oInput-Output Differential Voltage

P_d

Power Dissipation

Internally Limited

T_opr

Operating Junction Temperature Range (*) forLM217M

forLM317M

-40 to 125

0 to 125

^oC

T_stg

Storage Temperature Range

-55 to 150

^oC

(*) Re-Boot is not guaranteed for T_j≥ 85 ^oC

THERMAL DATA

Symbol

Parameter

SOT-82

TO-220

Unit

SOT-194

DPAK

R_thj-caseThermal Resistance Junction-case

R_thj-ambThermal Resistance Junction-ambient

Max

100

^oC/W

PIN CONNECTION AND ORDERING NUMBERS

TO-220

SOT-82

DPAK

SOT-194

Type

TO-220

DPAK

SOT-82

SOT-194

LM217M

LM317M

LM217MT

LM317MT

LM217MDT

LM317MDT

LM217MX

LM317MX

LM217MS

LM317MS

TEST CIRCUIT

2/11

LM217M/LM317M

ELECTRICAL CHARACTERISTICS FOR LM217M (Refer to the test circuits, -40 ≤ T_j≤ 125 ^oC

V_i- V_o= 5 V, I_o= 100 mA, P_d≤ 7.5W, unless otherwise specified)

Symbol

Parameter

Test Conditions

Min.

Typ.

0.01

0.02

Max.

0.02

0.05

Unit

%/V

∆V_o

Line Regulation

V_i- V_o= 3 to 40 V

T_j= 25 ^oC

∆V_o

Load Regulation

V_o≤ 5V

I_o= 10 mA to 500 mA

V_o≥ 5V

0.1

0.3

%/V_o

µA

I_o= 10 mA to 500 mA

I_ADJ

Adjustment Pin Current

100

∆I_ADJAdjustment Pin Current

V_i- V_o= 3 to 40 V

0.2

µA

I_o= 10 mA to 500 mA

V_REFReference Voltage

V_i- V_o= 3 to 40 V

I_o= 10 mA to 500 mA

1.2

1.25

0.7

1.3

∆V

Output Voltage Temperature

Stability

I_o(min)Minimum Load Current

I_o(max)Maximum Output Current

V_i- V_o= 40 V

3.5

V_i- V_o≤15V

500

1000

200

V_i- V_o=40V, P_d< P_dMAX, T =25^oC

e_N

Output Noise Voltage

(percentance of V_O)

B = 10Hz to 10KHz

T_j= 25 ^oC

f = 120 Hz

0.003

SVR Supply Voltage Rejection (*)

C_ADJ=0

C_ADJ=10µF

(*) CADJ is connected between Adjust pin and Ground.

ELECTRICAL CHARACTERISTICS FOR LM317M (Refer to the test circuits, 0 ≤ T_j≤ 125 ^oC

V_i- V_o= 5 V, I_o= 100 mA, P_d≤ 7.5W, unless otherwise specified)

Symbol

Parameter

Test Conditions

Min.

Typ.

0.01

0.02

Max.

0.04

0.07

Unit

%/V

∆V_o

Line Regulation

V_i- V_o= 3 to 40 V

T_j= 25 ^oC

∆V_o

Load Regulation

V_o≤ 5V

I_o= 10 mA to 500 mA

V_o≥ 5V

0.1

0.3

0.5

1.5

100

%/V_o

µA

I_o= 10 mA to 500 mA

I_ADJ

Adjustment Pin Current

∆I_ADJAdjustment Pin Current

V_i- V_o= 3 to 40 V

0.2

µA

I_o= 10 mA to 500 mA

V_REFReference Voltage

V_i- V_o= 3 to 40 V

I_o= 10 mA to 500 mA

1.2

1.25

0.7

1.3

∆V

Output Voltage Temperature

Stability

I_o(min)Minimum Load Current

I_o(max)Maximum Output Current

V_i- V_o= 40 V

3.5

V_i- V_o≤15V

500

1000

200

V_i- V_o=40V, P_d< P_dMAX, T =25^oC

e_N

Output Noise Voltage

(percentance of V_O)

B = 10Hz to 10KHz

T_j= 25 ^oC

f = 120 Hz

0.003

SVR Supply Voltage Rejection (*)

C_ADJ=0

C_ADJ=10µF

(*) CADJ is connected between Adjust pin and Ground.

3/11

LM217M/LM317M

Figure 1 : Current Limit

Figure 2 : Minimum Operating Current

Figure 3 : Basic Adjustable Regulator.

LM317M

Figure 4 : Thermal Resistance & Maximum Power Dissipation vs P.C.B. Copper Lenght for DPAK

Pdmax calculated for T_a= 50 ^oC

4/11

LM217M/LM317M

APPLICATION INFORMATION

A 0.1µF disc or 1µF tantalium input bypass

capacitor (C_I) is recommended to reduce the

sensitivity to input line impedance.

The adjustment terminal may be bypassed to

ground to improve ripple rejection. This capacitor

(C_adj) prevents ripple from being amplified as the

output voltage is increased. A 10µF capacitor

should improve ripple rejection about 80dB at

120Hz an a 10V application.

The LM317M provides an internal reference

voltage of 1.25V between the output and

adjustments terminals. This is used to set a

constant current flow across an external resistor

divider (see fig. 3), giving an output voltage V_Oof:

R₂

R₁

V_O= V_REF(1 +

) + I_ADJR₂

The device was designed to minimize the term

I_ADJ(100µA max) and to maintain it very constant

with line and load changes. Usually, the error

term IADJ R2 can be neglected. To obtain the

previous requirement, all the regulator quiescent

current is returned to the output terminal,

imposing a minimum load current condition. If the

load is insufficient, the output voltage will rise.

Although the LM317M is stable with no output

capacitance like any feedback circuit, certain

values of external capacitance can cause

excessive ringing. An output capacitance (C_O) in

the form of a 1µF tantalium or 25µF aluminium

electrolytic capacitor on the output swamps this

effect and insures stability.

Since the LM317M is a floating regulator and

”sees” only the input-to-outputdifferential voltage,

supplies of very high voltage with respect to

ground can be regulated as long as the maximum

input-to-output differential is not exceeded.

Furthermore, programmable regulator are easily

obtainable and, by connecting a fixed resistor

between the adjustment and output, the device

can be used as a precision current regulator.

In order to optimise the load regulation, the

current set resistor R1 (see fig. 3) should be tied

as close as possible to the regulator, while the

ground terminal of R2 should be near the ground

of the load to provide remote ground sensing.

PROTECTION DIODES (Fig.5)

When external capacitors are used with any IC

regulator it is sometimes necessary to add

protection diodes to prevent the capacitors from

discharging through low current points into the

regulator.

Figure

show the LM317M with the

recommended protection diodes for output

voltages in excess of 25V or high capacitance

values (C₃> 25µF, C₂> 10µF). Diode D1

prevents C₃from discharging through the IC

during an input short-circuit. The combination of

diodes D1 and D2 prevents C₂from discarging

through the regulator during an input or output

short-circuit.

EXTERNAL CAPACITORS (Fig.5)

Normally no capacitors are needed unless the

device is situated far from the input filter

capacitors; in which case an input bypass is

needed.

START-UP BLOCK

It’s not guaranteed the Re-Boot of the device

when the junction temperature is over 85 ^oC.

5/11

LM217M/LM317M

Figure 5 : Voltage Regulator with Protection Diodes.

LM317M

Figure 6 : Slow Turn-on 15V Regulator.

Figure 7 : Current Regulator.

LM317M

1.25V

ref

+ I

≈

ADJ

Figure 8 : 5V Electronic Shut-down Regulator.

Figure 9 : Digitally Selected Outputs.

LM317M

(R2 sets maximum V_o)

6/11

LM217M/LM317M

TO-220 MECHANICAL DATA

inch

DIM.

MIN.

TYP.

MAX.

4.8

MIN.

TYP.

MAX.

0.189

0.054

0.110

0.053

0.022

0.037

0.055

0.205

0.409

1.37

2.8

2.4

1.2

0.094

0.047

0.014

0.024

0.045

0.195

1.35

0.55

0.94

1.4

0.35

0.61

1.15

4.95

5.08

5.21

10.4

0.200

Dia.

10.05

0.396

16.2

26.7

0.638

1.051

26.3

2.6

27.1

1.035

0.102

0.594

0.236

0.144

1.067

0.118

0.622

0.260

0.152

15.1

15.8

6.6

3.65

3.85

P011D

7/11

LM217M/LM317M

TO-252 (DPAK) MECHANICAL DATA

inch

TYP.

DIM.

MIN.

2.2

TYP.

MAX.

2.4

MIN.

0.086

0.035

0.001

0.025

0.204

0.017

0.019

0.236

0.252

0.173

0.368

MAX.

0.094

0.043

0.009

0.035

0.212

0.023

0.244

0.260

0.181

0.397

0.9

1.1

0.03

0.64

5.2

0.23

0.9

5.4

0.45

0.48

0.6

6.2

6.4

6.6

4.4

4.6

9.35

10.1

0.8

0.031

0.6

0.023

0.039

DETAIL ”A”

0068772-B

8/11

LM217M/LM317M

SOT-82 MECHANICAL DATA

inch

DIM.

MIN.

7.4

TYP.

MAX.

7.8

MIN.

0.291

0.413

0.028

0.019

0.04

TYP.

MAX.

0.307

0.445

0.035

0.030

0.106

10.5

0.7

11.3

0.9

0.49

2.4

0.75

2.7

1.2

15.7

2.2

0.047

0.618

0.087

0.173

0.150

0.100

4.4

3.8

2.54

P032A

9/11

LM217M/LM317M

SOT-194 MECHANICAL DATA

inch

TYP.

DIM.

MIN.

7.4

TYP.

MAX.

7.8

MIN.

0.291

0.413

0.028

0.019

0.094

MAX.

0.307

0.445

0.035

0.030

0.106

10.5

0.7

11.3

0.9

0.49

2.4

0.75

2.7

1.2

1.3

0.047

0.051

0.236

0.087

0.173

0.150

2.2

4.4

3.8

2.54

0.100

45 (typ.)

0.157

0.079

0.004

0.1

P032B

10/11

LM217M/LM317M

Information furnished is believed to be accurateand reliable. However, SGS-THOMSON Microelectronics assumes no responsabilityfor the

consequences of use of such informationnor for any infringement of patents or other rights of third parties which may results from its use. No

license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifications mentioned

in this publication are subject to change without notice. This publication supersedes and replaces all informationpreviously supplied.

SGS-THOMSONMicroelectronics products are notauthorized for use as critical components in life support devices or systems without express

written approval of SGS-THOMSON Microelectonics.

SGS-THOMSON Microelectronics GROUP OF COMPANIES

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11/11

LM317MX [STMICROELECTRONICS]

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