LSN-1.8/10-D12J-C_技术文档

LSN-10A D12 Models

Single Output, Non-Isolated, 12VIN, 1-5VOUT, 10A, DC/DC's in SIP Packages

LSN Series D12 SIP's (single-in-line packages) are ideal building

blocks for emerging, on-board power-distribution schemes in which

isolated 12V buses deliver power to any number of non-isolated, step-

down buck regulators. LSN D12 DC/DC's accept a 12V input (10.8V

to 13.2V input range) and convert it, with the highest efﬁciency in the

smallest space, to a 1, 1.1, 1.2, 1.3, 1.5, 1.8, 2, 2.5, 3.3 or 5 Volt output

fully rated at 10 Amps.

LSN D12's are ideal point-of-use/load power processors. They typi-

cally require no external components. Their vertical-mount packages

occupy a mere 0.7 square inches (4.5 sq. cm), and reversed pin vertical

mount allows mounting to meet competitor's keep out area. Horizontal-

mount packages ("H" sufﬁx) are only 0.34 inches (8.6mm) high.

The LSN's best-in-class power density is achieved with a fully

synchronous, ﬁxed-frequency, buck topology that also delivers: high

efﬁciency (96% for 5V^OUTmodels), low noise (30 to 50mVp-p typ.),

tight line/load regulation ( 0.1%/ 0.25% max.), quick step response

(100μsec), stable no-load operation, and no output reverse conduction.

The fully functional LSN’s feature output overcurrent detection,

continuous short-circuit protection, an output-voltage trim function, a

remote on/off control pin

Features

N

Step-down buck regulators for new

distributed 12V power architectures

12V input (10.8-13.2V range)

1 to 5V^OUT@10A

N

Non-isolated, ﬁxed-frequency,

synchronous-rectiﬁer topology

N

Outstanding performance:

v

1.25ꢀ setpoint accuracy

Efﬁciencies to 96ꢀ @ 10 Amps

Noise as low as 30mVp-p

Stable no-load operation

(pull high to disable), thermal shutdown and a sense pin. High efﬁciency

enables

the LSN D12's to deliver rated output currents of 10 Amps at ambient

temperatures

v Trimmable output voltage

Remote on/off control

N

Sense pin on standard models

Thermal shutdown

to +68°C with 100 lfm air ﬂow.

If your new system boards call for three or more supply voltages,

check out the economics of on-board 12V distributed power. If you don't

need to pay for multiple isolation barriers, DATEL's non-isolated LSN

D12 SIP's will save you money.

No derating to +68°C with 100 lfm

UL/IEC/EN60950 certiﬁed

EMC compliant

+OUTPUT

(1,2,4)

+INPUT

(7,8)

10.57

~

+SENSE

66μF

100μF

330μF

(3)

COMMON

(5)

COMMON

(6)

CURRENT

SENSE

V

CC

PWM

ON/OFF

CONTROL

(11)

REFERENCE &

ERROR AMP

CONTROLLER

V

TRIM

(10)

OUT

~ For devices with the sense-pin removed ("B" sufﬁx),

the feedback path is through the +Output pin and not

the +Sense pin.

Typical topology is shown

For full details go to

www.murata-ps.com/rohs

Figure 1. Simpliﬁed Schematic

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MDC_LSN10A-D12.B01 Page 1 of 12

LSN-10A D12 Models

Single Output, Non-Isolated, 12VIN, 1-5VOUT, 10A, DC/DC's in SIP Packages

~

Performance Speciﬁcations and Ordering Guide

Output

Input

Efﬁciency

Full Load

Package

(Case,

Pinout)

½ Load

Typ.

R/N (mVp-p)

Regulation (Max.)

VIN Nom.

(Volts)

Range

(Volts)

IIN

V^OUT

(Volts)

IOUT

(Amps)

Root Model

Typ.

Max.

Line

Load

(mA/A)

Min.

Typ.

LSN-1/10-D12

LSN-1.1/10-D12

LSN-1.2/10-D12

LSN-1.3/10-D12

LSN-1.5/10-D12

LSN-1.8/10-D12

LSN-2/10-D12

LSN-2.5/10-D12

LSN-3.3/10-D12

LSN-3.8/10-D12

LSN-5/10-D12

1

10

45

30

35

40

50

65

60

45

50

55

75

0.1ꢀ

0.ꢁ5ꢀ

1ꢁ

10.8-13.ꢁ

39/1.0ꢁ

45/1.1

45/1.19

45/1.3

54/1.47

53/1.75

59/1.9

60/ꢁ.3

69/3

83ꢀ

85ꢀ

86ꢀ

88ꢀ

89ꢀ

90.5ꢀ

91ꢀ

9ꢁ.5ꢀ

94ꢀ

95ꢀ

96ꢀ

86ꢀ

87.5ꢀ

88ꢀ

B5/B5x, P59

1.1

1.ꢁ

1.3

1.5

1.8

ꢁ

85ꢀ

86ꢀ

87ꢀ

89.5ꢀ

90ꢀ

88.5ꢀ

90.5ꢀ

9ꢁ.5ꢀ

93ꢀ

ꢁ.5

3.3

3.8

5

9ꢁꢀ

93.5ꢀ

N/A

69/3.33

75/4.5

94ꢀ

95.5ꢀ

These devices have no minimum-load requirements and will regulate under no-load conditions.

Regulation speciﬁcations describe the output-voltage deviation as the line voltage or load is

varied from its nominal/midpoint value to either extreme.

~ Typical at TA = +ꢁ5°C under nominal line voltage and full-load conditions, unless noted. All

models are tested and speciﬁed with external ꢁꢁμF tantalum input and output capacitors. The

capacitors are necessary to accommodate our test equipment and may not be required to

achieve speciﬁed performance in your applications. See I/O Filtering and Noise Reduction.

Ripple/Noise (R/N) is tested/speciﬁed over a ꢁ0MHz bandwidth and may be reduced with

external ﬁltering. See I/O Filtering and Noise Reduction for details.

Nominal line voltage, no-load/full-load conditions.

These are not complete model numbers. Please refer to the Part Number Structure when

ordering.

M E C H A N I C A L S P E C I F I C A T I O N S

P A R T N U M B E R S T R U C T U R E

0.34

(8.64)

L SN - 1.8 / 10- D12 B H J

- C

2.00

(50.80)

Output

Conﬁguration:

L = Unipolar

0.20

(5.08)

RoHS-6

compliant*

0.17

(4.32)

Low Voltage

0.55

(13.97)

J Sufﬁx:

Reversed Pin

Vertical Mount

1

2

3 4 5

6 7 8 9 10 11

Non-Isolated SIP

Nominal Output Voltage:

1, 1.1, 1.ꢁ, 1.3, 1.5, 1.8, ꢁ, ꢁ.5, 3.3

or 5 Volts

H Sufﬁx:

Horizontal Mount

0.110

(2.79)

0.030 0.001 DIA.

(0.762 0.025)

0.05

(1.27)

1.000

(25.40)

0.400

(10.16)

0.500

(12.70)

0.046

(1.17)

Maximum Rated Output

Current in Amps

B Sufﬁx:

No Remote Sense (Pin 3 removed)

4 EQ. SP. @

0.100 (2.54)

5 EQ. SP. @

0.100 (2.54)

Input Voltage Range:

D12 = 10.8 to 13.ꢁ Volts (1ꢁV nominal)

Note: Not all model number

combinations are available.

Contact Murata Power Solutions

Case B5

Vertical Mounting

(Standard)

0.34

(8.64)

LAYOUT PATTERN

TOP VIEW

* Contact Murata Power Solutions Technologies

(DATEL) for availability.

0.25

(6.35)

0.35

(8.89)

0.36

(9.14)

2.00

(50.80)

2.00

(50.80)

0.21

(5.33)

0.20

(5.08)

ISOLATING

PAD

0.05

(1.27)

0.17

(4.32)

0.55

(13.97)

0.55

(13.97)

1

2

3 4 5

6

7 8 9 10 11

1

2

3 4 5

6 7 8 9 10 11

0.16

(4.06

0.030 0.001 DIA.

(0.762 0.025)

0.05

(1.27)

0.046

(1.17)

0.030 0.001 DIA.

(0.762 0.025)

0.05

(1.27)

0.360

(9.14)

1.000

(25.40)

0.400

(10.16)

0.500

(12.70)

0.106

(2.69)

1.000

(25.40)

0.400

(10.16)

0.500

(12.70)

4 EQ. SP. @

0.100 (2.54)

5 EQ. SP. @

0.100 (2.54)

4 EQ. SP. @

0.100 (2.54)

5 EQ. SP. @

0.100 (2.54)

0.56

0.53

(14.22)

(13.46)

Case B5B

Reverse Pin

Case B5A

Horizontal Mounting

LAYOUT PATTERN

TOP VIEW

0.36

(9.14)

0.306

(7.8)

Vertical Mounting

(Tyco-compatible)

0.55

(13.97)

0.50

(12.7)

I/O Connections

Pin Function P59*

5

Function P59* Pin Function P59*

LAYOUT PATTERN

TOP VIEW

RECOMMENDED

COPPER PAD

1

ꢁ

3

4

+Output

+Sense *

+Output

Common

+Input

9

No Pin

V^OUTTrim

6

10

11

ON PCB (0.55 SQ. IN.)

*

Pin 3 (+Sense) removed

for "B" sufﬁx models.

7

On/Off Control

8

+Input

DIMENSIONS IN INCHES (mm)

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MDC_LSN10A-D12.B01 Page 2 of 12

LSN-10A D12 Models

Single Output, Non-Isolated, 12VIN, 1-5VOUT, 10A, DC/DC's in SIP Packages

Performance/Functional Speciﬁcations

Typical @ TA = +ꢁ5°C under nominal line voltage and full-load conditions unless noted. ~

Input

Absolute Maximum Ratings

Input Voltage Range

10.8-13.ꢁ Volts (1ꢁV nominal)

Input Voltage:

Input Current:

Continuous or transient

15 Volts

+VIN

Normal Operating Conditions

Inrush Transient

Standby/Off Mode

See Ordering Guide

0.08A^ꢁsec

8mA

On/Off Control (Pin 11)

Input Reverse-Polarity Protection

Output Overvoltage Protection

Output Current

None

Output Short-Circuit Condition

40mA average

Input Reﬂected Ripple Current

Input Filter Type

100mAp-p

Capacitive (66μF)

None

Current limited. Devices can

withstand sustained output short

circuits without damage.

Overvoltage Protection

Reverse-Polarity Protection

Undervoltage Shutdown

On/Off Control

Storage Temperature

–40 to +1ꢁ5°C

+300°C

None

Lead Temperature (soldering, 10 sec.)

None

These are stress ratings. Exposure of devices to any of these conditions may adversely

affect long-term reliability. Proper operation under conditions other than those listed in the

Performance/Functional Speciﬁcations Table is not implied.

On = open (internal pull-down)

Off = +ꢁ.8V to +VIN (<3mA)

Output

T E C H N I C A L N O T E S

VOUT Accuracy (50ꢀ load)

Minimum Loading ~

Maximum Capacitive Load

V^OUTTrim Range

1.ꢁ5ꢀ maximum

No load

Return Current Paths

ꢁ000μF (low ESR, OSCON)

10ꢀ

The LSN D1ꢁ SIP’s are non-isolated DC/DC converters. Their two Common

pins (pins 5 and 6) are connected to each other internally (see Figure 1). To

the extent possible (with the intent of minimizing ground loops), input return

current should be directed through pin 6 (also referred to as –Input or Input

Return), and output return current should be directed through pin 5 (also

referred to as –Output or Output Return). Any on/off control signals applied to

pin 11 (On/Off Control) should be referenced to Common

Ripple/Noise (ꢁ0MHz BW) ~

Total Accuracy

See Ordering Guide

3ꢀ over line/load/temperature

See Ordering Guide

Efﬁciency

Overcurrent Detection and Short-Circuit Protection:

Current-Limiting Detection Point

Short-Circuit Detection Point

SC Protection Technique

Short-Circuit Current

17 (13-ꢁ3.5) Amps

98ꢀ of VOUT set

Hiccup with auto recovery

400mA average

(speciﬁcally pin 6).

I/O Filtering and Noise Reduction

Dynamic Characteristics

All models in the LSN D1ꢁ Series are tested and speciﬁed with external

ꢁꢁμF tantalum input and output capacitors. These capacitors are necessary

to accommodate our test equipment and may not be required to achieve?

desired performance in your application. The LSN D1ꢁ's are designed with

high-quality, high-performance internal I/O caps, and will operate within spec

in most applications with no additional external components.

Transient Response (50ꢀ load step)

100μsec to ꢁꢀ of ﬁnal value

Start-Up Time:

V^INto VOUT and On/Off to VOUT

70msec for VOUT = 1V

16msec for V^OUT= 1.1V to 5V

Switching Frequency:

1V/1.1V, 1.ꢁV, 1.3 Models

1.5V/1.8V, ꢁV Models

ꢁ.5V, 3.3V, 5V Models

105/1ꢁ5kHz 10ꢀ

160/177kHz 10ꢀ

ꢁ00kHz 7.5ꢀ

In particular, the LSN D1ꢁ's input capacitors are speciﬁed for low ESR

and are fully rated to handle the units' input ripple currents. Similarly, the

internal output capacitors are speciﬁed for low ESR and full-range frequency

response. As shown in the Performance Curves, removal of the external

ꢁꢁμF tantalum output caps has minimal effect on output noise.

Environmental

ꢁ.3-1.8 million hours (1VOUT to 5VOUT)

Calculated MTBF

Operating Temperature: (Ambient)

Without Derating (Natural convection) –40 to +48/64°C (model dependent)

With Derating

See Derating Curves

In critical applications, input/output ripple/noise may be further reduced using

ﬁltering techniques, the simplest being the installation of external I/O caps.

Thermal Shutdown

+115°C

Physical

External input capacitors serve primarily as energy-storage devices. They

minimize high-frequency variations in input voltage (usually caused by IR

drops in conductors leading to the DC/DC) as the switching converter draws

pulses of current. Input capacitors should be selected for bulk capacitance

(at appropriate frequencies), low ESR, and high rms-ripple-current ratings.

The switching nature of modern DC/DC's requires that the dc input voltage

source have low ac impedance at the frequencies of interest. Highly inductive

source impedances can greatly affect system stability.Your speciﬁc system

conﬁguration may necessitate additional considerations.

Dimensions

See Mechanical Speciﬁcations

Pin Dimensions/Material

0.03" (0.76mm) round copper alloy with

tin plate over nickel underplate

Weight

0.3 ounces (8.5g)

Flamability Rating

Safety

UL94V-0

UL/cUL/IEC/EN 60950, CSA-Cꢁꢁ.ꢁ No. ꢁ34

~ All models are tested/speciﬁed with external ꢁꢁμF input/output capacitors.These caps

accommodate our test equipment and may not be required to achieve speciﬁed performance

in your applications. All models are stable and regulate within spec under no-load conditions.

See Technical Notes and Performance Curves for details.

The On/Off Control (pin 11) is designed to be driven with open-collector logic or the appli-

cation of appropriate voltages (referenced to Common, pins 5 and 6).

Output noise may be further reduced with the installation of additional external output

ﬁltering. See I/O Filtering and Noise Reduction.

MTBF’s are calculated using Telcordia SR-33ꢁ(Bellcore), ground ﬁxed, T^A= +ꢁ5°C, full

power, natural convection, +67°C pcb temperature.

Output ripple/noise (also referred to as periodic and random deviations or

PARD) may be reduced below speciﬁed limits with the installation of addi-

tional external output capacitors. Output capacitors function as true ﬁlter

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MDC_LSN10A-D12.B01 Page 3 of 12

LSN-10A D12 Models

Single Output, Non-Isolated, 12VIN, 1-5VOUT, 10A, DC/DC's in SIP Packages

elements and should be selected for bulk capacitance, low ESR, and appro-

Remote Sense

priate frequency response. Any scope measurements of PARD should be

made directly at the DC/DC output pins with scope probe ground less than

0.5" in length.

LSN D1ꢁ SIP Series DC/DC converters offer an output sense function on

pin 3. The sense function enables point-of-use regulation for overcoming

moderate IR drops in conductors and/or cabling. Since these are non-isolated

devices whose inputs and outputs usually share the same ground plane,

sense is provided only for the +Output.

All external capacitors should have appropriate voltage ratings and be located

as close to the converters as possible. Temperature variations for all relevant

parameters should be taken into consideration.

The remote sense line is part of the feedback control loop regulating the

DC/DC converter’s output. The sense line carries very little current and

consequently requires a minimal cross-sectional-area conductor. As such, it

is not a low-impedance point and must be treated with care in layout and

cabling. Sense lines should be run adjacent to signals (preferably ground),

and in cable and/or discrete-wiring applications, twisted-pair or similar tech-

niques should be used. To prevent high frequency voltage differences between

V^OUTand Sense, we recommend installation of a 1000pF capacitor close to

the converter.

The most effective combination of external I/O capacitors will be a function

of your line voltage and source impedance, as well as your particular load and

layout conditions. Our Applications Engineers can recommend potential solu-

tions and discuss the possibility of our modifying a given device’s internal ﬁlter-

ing to meet your speciﬁc requirements. Contact our Applications Engineering

Group for additional details.

Input Fusing

Most applications and or safety agencies require the installation of fuses

at the inputs of power conversion components. LSN D1ꢁ Series DC/DC

converters are not internally fused. Therefore, if input fusing is mandatory,

either a normal-blow or a slow-blow fuse with a value no greater than 9 Amps

should be installed within the ungrounded input path to the converter.

The sense function is capable of compensating for voltage drops between the

+Output and +Sense pins that do not exceed 10ꢀ of V^OUT.

[V^OUT(+) – Common] – [Sense(+) – Common] b 10ꢀVOUT

Power derating (output current limiting) is based upon maximum output cur-

rent and voltage at the converter's output pins. Use of trim and sense func-

tions can cause the output voltage to increase, thereby increasing output

power beyond the LSN's speciﬁed rating. Therefore:

As a rule of thumb however, we recommend to use a normal-blow or slow-

blow fuse with a typical value of about twice the maximum input current,

calculated at low line with the converters minimum efﬁciency.

(V^OUTat pins) x (IOUT) b rated output power

Safety Considerations

The internal 10.57 resistor between +Sense and +Output (see Figure 1)

serves to protect the sense function by limiting the output current ﬂowing

through the sense line if the main output is disconnected. It also prevents

output voltage runaway if the sense connection is disconnected.

LSN D1ꢁ SIP's are non-isolated DC/DC converters. In general, all DC/DC's

must be installed, including considerations for I/O voltages and spacing/

separation requirements, in compliance with relevant safety-agency speci-

ﬁcations (usually UL/IEC/EN60950).

Note: Connect the +Sense pin (pin 3) to +Output (pin 4) at the DC/DC

converter pins, if the sense function is not used for remote regulation.

In particular, for a non-isolated converter's output voltage to meet SELV

(safety extra low voltage) requirements, its input must be SELV compliant.

If the output needs to be ELV (extra low voltage), the input must be ELV.

On/Off Control and Power-up Sequencing

Input Overvoltage and Reverse-Polarity Protection

The On/Off Control pin may be used for remote on/off operation. LSN D1ꢁ SIP

Series DC/DC's are designed so they are enabled when the control pin is

left open (internal pull-down to Common) and disabled when the control pin is

pulled high (+ꢁ.8V to +V^IN), as shown in Figure ꢁ and ꢁa.

LSN D1ꢁ SIP Series DC/DC's do not incorporate either input overvoltage

or input reverse-polarity protection. Input voltages in excess of the speciﬁed

absolute maximum ratings and input polarity reversals of longer than "instan-

taneous" duration can cause permanent damage to these devices.

Dynamic control of the on/off function is best accomplished with a mechanical

relay or open-collector/open-drain drive circuit. The drive circuit should be

able to sink appropriate current when activated and withstand appropriate

voltage when deactivated.

Start-Up Time

The V^INto VOUT Start-Up Time is the interval between the time at which a

ramping input voltage crosses the lower limit of the speciﬁed input voltage

range (10.8 Volts) and the fully loaded output voltage enters and remains

within its speciﬁed accuracy band. Actual measured times will vary with input

source impedance, external input capacitance, and the slew rate and ﬁnal

value of the input voltage as it appears to the converter.

+INPUT

10k7

4.12k7

ON/OFF

CONTROL

1.62k7

The On/Off to V^OUTStart-Up Time assumes the converter is turned off via the

On/Off Control with the nominal input voltage already applied to the converter.

The speciﬁcation deﬁnes the interval between the time at which the converter

is turned on and the fully loaded output voltage enters and remains within its

speciﬁed accuracy band. See Typical Performance Curves.

COMMON

Figure 2. Driving the On/Off Control Pin with an Open-Collector Drive Circuit

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MDC_LSN10A-D12.B01 Page 4 of 12

LSN-10A D12 Models

Single Output, Non-Isolated, 12VIN, 1-5VOUT, 10A, DC/DC's in SIP Packages

The on/off control function, however, can be externally inverted so that the

The equations below can be used as starting points for selecting speciﬁc trim-

converter will be disabled while the input voltage is ramping up and then

"released" once the input has stabilized.

resistor values. Recall, untrimmed devices are guaranteed to be p1ꢀ accurate.

Adjustment beyond the speciﬁed 10ꢀ adjustment range is not recommended.

For a controlled start-up of one or more LSN-D1ꢁ's, or if several output

voltages need to be powered-up in a given sequence, the On/Off Control pin

can be pulled high (external pull-up resistor, converter disabled) and then

driven low with an external open collector device to enable the converter.

ꢅ/54054

ꢅ).054

ꢀꢁK7

ꢂꢃꢄꢁ

+INPUT

42)-

,/!$

4URNS

10k7

5.6k7

#/--/.

4.12k7

#/--/.

ON/OFF

CONTROL

1.62k7

Figure 3.Trim Connections Using a Trimpot

COMMON

ꢅ/54054

Figure 2a. Inverting On/Off Control Pin Signal and Power-Up Sequencing

Note:

4RIM

$OWN

ꢅ).054

Install either a ﬁxed

trim-up resistor

Output Overvoltage Protection

42)-

,/!$

or a ﬁxed trim-down

resistor depending upon

desired output voltage.

LSN D1ꢁ SIP Series DC/DC converters do not incorporate output overvolt-

age protection. In the extremely rare situation in which the device’s feedback

loop is broken, the output voltage may run to excessively high levels (V^OUT=

V^IN). If it is absolutely imperative that you protect your load against any and

all possible overvoltage situations, voltage limiting circuitry must be provided

external to the power converter.

4

RIM

#/--/.

5P

#/--/.

Figure 4.Trim Connections Using Fixed Resistors

Trim Equations

Output Overcurrent Detection

1.82(VO – 0.8)

– X

RT_DOWN(kꢀ) =

RT_UP(kꢀ) =

VO _NOM– VO

Overloading the output of a power converter for an extended period of

time will invariably cause internal component temperatures to exceed their

maximum ratings and eventually lead to component failure. High-current-

carrying components such as inductors, FET's and diodes are at the highest

risk. LSN D1ꢁ SIP Series DC/DC converters incorporate an output overcur-

rent detection and shutdown function that serves to protect both the power

converter and its load.

1.46

VO – VO

NOM

LSN-1/10-D12: X = 0.909

LSN-1.1/10-D12: X = 2.49

LSN-1.2/10-D12: X = 3.09

LSN-1.3/10-D12: X = 4.12

If the output current exceeds it maximum rating by typically 70ꢀ (17 Amps) or

if the output voltage drops to less than 98ꢀ of it original value, the LSN D1ꢁ's

internal overcurrent-detection circuitry immediately turns off the converter,

which then goes into a "hiccup" mode. While hiccupping, the converter will

continuously attempt to restart itself, go into overcurrent, and then shut down.

Under these conditions, the average output current will be approximately

400mA, and the average input current will be approximately 40mA. Once the

output short is removed, the converter will automatically restart itself.

4.64(VO – 0.8)

– X

RT_DOWN(kꢀ) =

VO _NOM– VO

3.72

RT_UP(kꢀ) =

VO – VO

NOM

LSN-1.5/10-D12: X = 13.3

LSN-1.8/10-D12: X = 16.9

LSN-2/10-D12: X = 15.4

7.5(VO – 0.8)

Output Voltage Trimming

– X

RT_DOWN(kꢀ) =

VO _NOM– VO

Allowable trim ranges for each model in the LSN D1ꢁ SIP Series are 10ꢀ.

Trimming is accomplished with either a trimpot or a single ﬁxed resistor. The

trimpot should be connected between +Output and Common with its wiper

connected to the Trim pin as shown in Figure 3 below.

6

RT_UP(kꢀ) =

VO – VO

NOM

LSN-2.5/10-D12: X = 20

LSN-3.3/10-D12: X = 15

LSN-5/10-D12: X = 10

A trimpot can be used to determine the value of a single ﬁxed resistor

which can then be connected, as shown in Figure 4, between the Trim pin

and +Output to trim down the output voltage, or between the Trim pin and

Common to trim up the output voltage. Fixed resistors should have absolute

TCR’s less than 100ppm/oC to ensure stability.

Note: Resistor values are in k7. Accuracy of adjustment is subject to

tolerances of resistors and factory-adjusted, initial output accuracy.

V^O= desired output voltage. VO_NOM= nominal output voltage.

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MDC_LSN10A-D12.B01 Page 5 of 12

LSN-10A D12 Models

Single Output, Non-Isolated, 12VIN, 1-5VOUT, 10A, DC/DC's in SIP Packages

Output Reverse Conduction

varying the load to keep that temperature below +110°C under the assorted

conditions of air ﬂow and air temperature. Once the temperature exceeds

+115°C (approx.), the thermal protection will disable the converter. Automatic

restart occurs after the temperature has dropped below +110°C.

Many DC/DC's using synchronous rectiﬁcation suffer from Output Reverse

Conduction. If those devices have a voltage applied across their output before

a voltage is applied to their input (this typically occurs when another power

supply starts before them in a power-sequenced application), they will either

fail to start or self destruct. In both cases, the cause is the "freewheeling" or

"catch" FET biasing itself on and effectively becoming a short circuit.

All but the last two DUT's were vertical-mount models, and the direction of air

ﬂow was parallel to the unit in the direction from pin 11 to pin 1.

LSN D1ꢁ SIP DC/DC converters are not damaged from Output Reverse

Conduction. They employ proprietary gate drive circuitry which makes them

immune to applied voltages during the startup sequence. If you are using

an external power source paralleled with the LSN, be aware that during the

start up phase, some low impedance condition or transient current may be

absorbed brieﬂy into the LSN output terminals before voltage regulation is

fully established.You should insure that paralleled external power sources are

not disrupted by this condition during LSN start up.

As you may deduce from the derating curves and observe in the efﬁciency

curves on the following pages, LSN D1ꢁ SIP's maintain virtually constant

efﬁciency from half to full load, and consequently deliver very impressive

temperature performance even if operating at full load.

Lastly, when LSN D1ꢁ SIP's are installed in system boards, they are obvi-

ously subject to numerous factors and tolerances not taken into account here.

If you are attempting to extract the most current out of these units under

demanding temperature conditions, we advise you to monitor the output-

inductor temperature to ensure it remains below +110°C at all times.

Thermal Considerations and Thermal Protection

The typical output-current thermal-derating curves shown below enable

designers to determine how much current they can reliably derive from each

model of the LSN D1ꢁ SIP's under known ambient-temperature and air-ﬂow

conditions. Similarly, the curves indicate how much air ﬂow is required to

reliably deliver a speciﬁc output current at known temperatures.

Thermal Performance for "H" Models

Enhanced thermal performance can be achieved when LSN D1ꢁ SIP's are

mounted horizontally ("H" models) and the output inductor (with its electrically

isolating, thermally conductive pad installed) is thermally coupled to a copper

plane/pad (at least 0.55 square inches in area) on the system board.Your

conditions may vary, however our tests indicate this conﬁguration delivers a

16°C to ꢁꢁ°C improvement in ambient operating temperatures. See page 9

for thermal comparison of two horizontally mounted units.

The highest temperatures in LSN D1ꢁ SIP's occur at their output inductor,

whose heat is generated primarily by I^ꢁR losses. The derating curves were

developed using thermocouples to monitor the inductor temperature and

Typical Performance Curves for LSN D12 SIP Series

LSN-1/10-D12

Output Current vs. Ambient Temperature

(Vertical mount, air flow direction from pin 11 to pin 1)

Efficiency vs. Line Voltage and Load Current

89

87

85

83

12

10

8

Natural Convection

100 lfm

6

VIN = 10.8V

200 lfm

81

79

77

75

4

V

IN = 12V

2

V

IN = 13.2V

0

–40

0

60

70

80

90

100

110

Ambient Temperature (oC)

1

ꢁ

3

4

5

6

7

8

9

10

Load Current (Amps)

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MDC_LSN10A-D12.B01 Page 6 of 12

LSN-10A D12 Models

Single Output, Non-Isolated, 12VIN, 1-5VOUT, 10A, DC/DC's in SIP Packages

Typical Performance Curves for LSN D12 SIP Series

LSN-1.1/10-D12, LSN-1.2/10-D12, LSN-1.3/10-D12

Efficiency vs. Line Voltage and Load Current

LSN-1.1/10-D12, LSN-1.2/10-D12, LSN-1.3/10-D12

Output Current vs. Ambient Temperature

(Vertical mount, air flow direction from pin 11 to pin 1)

91

89

87

85

83

81

79

77

75

12

10

8

Natural Convection

100 lfm

6

200 lfm

V

IN = 10.8V

4

IN = 12V

2

IN = 13.2V

0

–40

0

60

70

80

90

100

110

Ambient Temperature (oC)

1

ꢁ

3

4

5

6

7

8

9

10

Load Current (Amps)

LSN-1.5/10-D12

Efficiency vs. Line Voltage and Load Current

LSN-1.5/10-D12

Output Current vs. Ambient Temperature

(Vertical mount, air flow direction from pin 11 to pin 1)

91

89

87

85

83

81

79

77

75

12

10

8

Natural Convection

100 lfm

6

200 lfm

V

IN = 10.8V

4

V

IN = 12V

2

V

IN = 13.2V

0

–40

0

60

70

80

90

100

110

Ambient Temperature (oC)

1

ꢁ

3

4

5

6

7

8

9

10

Load Current (Amps)

LSN-1.8/10-D12

Efficiency vs. Line Voltage and Load Current

LSN-1.8/10-D12

Output Current vs. Ambient Temperature

(Vertical mount, air flow direction from pin 11 to pin 1)

93

12

10

8

91

89

87

85

83

81

79

77

75

Natural Convection

100 lfm

6

200 lfm

4

V

IN = 10.8V

VIN = 12V

2

V

IN = 13.2V

0

–40

0

60

70

80

90

100

110

Ambient Temperature (oC)

1

ꢁ

3

4

5

6

7

8

9

10

Load Current (Amps)

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MDC_LSN10A-D12.B01 Page 7 of 12

LSN-10A D12 Models

Single Output, Non-Isolated, 12VIN, 1-5VOUT, 10A, DC/DC's in SIP Packages

Typical Performance Curves for LSN D12 SIP Series

LSN-2/10-D12

Efficiency vs. Line Voltage and Load Current

LSN-2/10-D12

Output Current vs. Ambient Temperature

(Vertical mount, air flow direction from pin 11 to pin 1)

93

91

89

87

85

83

81

79

77

75

12

10

8

Natural Convection

100 lfm

6

200 lfm

4

V

IN = 10.8V

VIN = 12V

2

V

IN = 13.2V

0

–40

0

50

60

70

80

90

100

110

Ambient Temperature (oC)

1

ꢁ

3

4

5

6

7

8

9

10

Load Current (Amps)

LSN-2.5/10-D12

Efficiency vs. Line Voltage and Load Current

LSN-2.5/10-D12

Output Current vs. Ambient Temperature

(Vertical mount, air flow direction from pin 11 to pin 1)

94

9ꢁ

90

88

86

84

8ꢁ

80

78

76

74

12

10

8

Natural Convection

100 lfm

6

200 lfm

V

IN = 10.8V

4

V

IN = 12V

2

V

IN = 13.2V

0

–40

0

50

60

70

80

90

100

110

Ambient Temperature (oC)

1

ꢁ

3

4

5

6

7

8

9

10

Load Current (Amps)

LSN-3.3/10-D12

Efficiency vs. Line Voltage and Load Current

LSN-3.3/10-D12

Output Current vs. Ambient Temperature

(Vertical mount, air flow direction from pin 11 to pin 1)

95

93

91

89

87

85

83

81

79

77

75

12

10

8

Natural Convection

100 lfm

6

200 lfm

V

IN = 10.8V

4

V

IN = 12V

2

V

IN = 13.2V

0

–40

0

50

60

70

80

90

100

110

Ambient Temperature (oC)

1

ꢁ

3

4

5

6

7

8

9

10

Load Current (Amps)

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MDC_LSN10A-D12.B01 Page 8 of 12

LSN-10A D12 Models

Single Output, Non-Isolated, 12VIN, 1-5VOUT, 10A, DC/DC's in SIP Packages

Typical Performance Curves for LSN D12 SIP Series

LSN-5/10-D12

Efficiency vs. Line Voltage and Load Current

LSN-5/10-D12

Output Current vs. Ambient Temperature

(Vertical mount, air flow direction from pin 11 to pin 1)

98

96

94

9ꢁ

90

88

86

84

8ꢁ

12

10

8

Natural Convection

100 lfm

6

200 lfm

V

IN = 10.8V

4

IN = 12V

2

IN = 13.2V

0

–40

0

40

50

60

70

80

90

100

Ambient Temperature (oC)

1

ꢁ

3

4

5

6

7

8

9

10

Load Current (Amps)

LSN-5/10-D12H (Horizontal Mount)

Output Current vs. Ambient Temperature

(Air flow direction from pin 11 to pin 1)

LSN-1/10-D12H (Horizontal Mount)

Output Current vs. Ambient Temperature

(Air flow direction from pin 11 to pin 1)

12

10

8

12

10

8

Natural Convection

100 lfm

6

200 lfm

4

2

0

–40

0

–40

0

40

50

60

70

80

90

100

0

50

60

70

80

90

100

110

Ambient Temperature (oC)

Input Reflected Ripple Current

(VIN = 12V, VOUT = 5V/10A, CIN/COUT = 22μF)

Input Inrush Current

(VIN = 12V, 7000μF as Input Switch)

2μsec/div

10μsec/div

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MDC_LSN10A-D12.B01 Page 9 of 12

LSN-10A D12 Models

Single Output, Non-Isolated, 12VIN, 1-5VOUT, 10A, DC/DC's in SIP Packages

Typical Performance Curves for LSN D12 SIP Series

Power-Up From VIN

(VIN = 12V, VOUT = 5V/10A, CIN = 22μF, COUT = 2000μF OSCON)

Power-Up From VIN

(VIN = 12V, VOUT = 5V/10A, CIN = 22μF, Output Filter 22μF-700nH-150μF)

4msec/div

Output Ripple Noise

(VIN = 12V, VOUT = 5V, Full Load, COUT = 22μF)

Output Ripple/Noise

(VIN = 12V, VOUT = 5V, Full Load, COUT = 2000μF OSCON)

1μsec/div

Dynamic Load Response

(VIN = 12V, VOUT = 5V/50 to 100% Load Step, CIN/COUT = 22μF)

Dynamic Load Response

(VIN = 12V, VOUT = 5V, 0 - 100% Load Step, CIN = 22μF, COUT = 2000μF OSCON)

Channel 2

Channel 1

100μs/div

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MDC_LSN10A-D12.B01 Page 10 of 12

LSN-10A D12 Models

Single Output, Non-Isolated, 12VIN, 1-5VOUT, 10A, DC/DC's in SIP Packages

Typical Performance Curves for LSN D12 SIP Series

Short Circuit Output Current

(10A/div, Period = 72msec)

Output Hiccup

(VIN = 12V/Output Short, CIN/COUT = 22μF)

(IIN = 39mA average, IOUT = 408mA average)

400μsec/div

20msec/div

E M I C O N D U C T E D / R A D I A T E D E M I S S I O N S

LSN-5/10-D12 Radiated Emissions

EN55022 Class B, 10 Meters

Converter Output = +5Vdc @ +10 Amps

If you’re designing with EMC in mind, please note that all of DATEL’s

LSN D1ꢁ DC/DC Converters have been characterized for conducted and

radiated emissions in our EMI/EMC laboratory. Testing is conducted in an

EMCO 5305 GTEM test cell utilizing EMCO automated EMC test software.

Conducted/Radiated emissions are tested to the limits of FCC Part 15, Class

B and CISPR ꢁꢁ (EN 550ꢁꢁ), Class B. Correlation to other speciﬁcations can

be supplied upon request. The corresponding emissions plots to FCC and

CISPR ꢁꢁ for model LSN-5/10-D1ꢁ appear below. The published EMC test

report is based on results with the highest possible output power model and

is therefore representative of the whole LSN-D1ꢁ series. Contact DATEL’s

Applications Engineering Department for more details.

80

70

60

50

40

30

20

10

0

EN 55022 Class B Limit

Radiated Emissions

–10

–20

LSN-5/10-D12 Conducted Emissions

FCC Part 15 Class B, EN55022 Class B Limit, +12 Vdc @ 4.5A

Converter Output = +5Vdc @ 10 Amps

100

1000

Frequency (MHz)

90

80

70

LSN-5/10-D12 Radiated Emissions

FCC Part 15 Class B, 3 Meters

Converter Output = +5Vdc @ 10 Amps

80

70

60

50

40

30

20

10

0

EN55022 Class B Limit

60

FCC Class B Limit

50

40

30

20

FCC Class B Limit

Conducted Emissions

10

0

0.1

1.0

Frequency (MHz)

10.0

Radiated Emissions

–10

–20

100

1000

Frequency (MHz)

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MDC_LSN10A-D12.B01 Page 11 of 12

LSN-10A D12 Models

Single Output, Non-Isolated, 12VIN, 1-5VOUT, 10A, DC/DC's in SIP Packages

P A R T N U M B E R S T R U C T U R E

Functional Options

Remote Sense Pin Removed ("B" sufﬁx)

L SN - 1.8 / 10- D12 B H J

- C

These devices have their +Sense pin (pin 3) removed, and the feedback

loop is closed through the +V^OUTpath. The 10.57 resistor in Figure 1 is

installed in both standard and "B" models. See the Output Sense Function.

Output

Conﬁguration:

L = Unipolar

RoHS

compliant

Low Voltage

Horizontal Mounting ("H" sufﬁx)

J Sufﬁx:

Reversed Pin

Vertical Mount

Non-Isolated SIP

This packaging conﬁguration reduces above-board height to 0.35" (8.89mm),

including the isolating pad. For "H" models, a thermally conductive, electri-

cally insulating "pad" is factory installed on the output inductor. The pad

material is Bergquist Sil Pad 400. The pad size is 0.4 x 0.5 x 0.009 inches

(10.16 x 1ꢁ.7 x 0.ꢁ3mm). This conﬁguration can signiﬁcantly improve thermal

performance. See Thermal Derating for details.

Nominal Output Voltage:

1, 1.1, 1.ꢁ, 1.3, 1.5, 1.8, ꢁ, ꢁ.5, 3.3 or

5 Volts

H Sufﬁx:

Horizontal Mount

Maximum Rated Output

Current in Amps

B Sufﬁx:

No Remote Sense

(Pin 3 removed)

Reversed pin vertical mounting ("J" sufﬁx)

Note: Not all model number

combinations are available.

Contact Murata Power Solutions

Technologies (DATEL).

Input Voltage Range:

D12 = 10.8 to 13.ꢁ Volts (1ꢁV nominal)

This additional mechanical conﬁguration consists of a low-proﬁle pin header

attached to the reverse side of the converter. It allows the LSN series to be

mechanically compatible with competitors' "keep out area."

RoHS compliance ("-C" sufﬁx)

Other Options and Modiﬁcations

Selected models use materials which are compatible with the Reduction of

Hazardous Substances (RoHS) directive.

Other options include a positive polarity (pull low to disable) on the On/Off

Control. Contact DATEL directly to discuss these and other possible modiﬁ-

cations.

Contact Murata Power Solutions Technologies (DATEL) for availability.

Examples

LSN-1.8/10-D12

Vertical-mount. Sense function on pin 3. No pin 9.

LSN-1.8/10-D12B Vertical-mount. Pin 3 (+Sense) removed. No pin 9.

LSN-1.8/10-D12H Horizontal-mount. Sense function on pin 3. No pin 9.

LSN-1.8/10-D12BH Horizontal-mount. Pin 3 (+Sense) removed. No pin 9.

LSN-1.8/10-D12J Reverse pin vertical-mount. Sense function on pin 3.

No pin 9.

USA:

Canada: Toronto, Tel: (866) 740-1232, email: toronto@murata-ps.com

UK: Milton Keynes, Tel: +44 (0)1908 615232, email: mk@murata-ps.com

Mansﬁeld (MA), Tel: (508) 339-3000, email: sales@murata-ps.com

Murata Power Solutions, Inc.

France: Montigny Le Bretonneux, Tel: +33 (0)1 34 60 01 01, email: france@murata-ps.com

Germany: München, Tel: +49 (0)89-544334-0, email: munich@murata-ps.com

11 Cabot Boulevard, Mansﬁeld, MA 02048-1151 U.S.A.

Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356

www.murata-ps.com email: sales@murata-ps.com ISO 9001 REGISTERED

Japan: Tokyo, Tel: 3-3779-1031, email: sales_tokyo@murata-ps.com

Osaka, Tel: 6-6354-2025, email: sales_osaka@murata-ps.com

Website: www.murata-ps.jp

Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other

technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply

the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Speciﬁcations are subject to change without

China:

Shanghai, Tel: +86 215 027 3678, email: shanghai@murata-ps.com

Guangzhou, Tel: +86 208 221 8066, email: guangzhou@murata-ps.com

notice.

04/08/08

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MDC_LSN10A-D12.B01 Page 12 of 12


型号：	LSN-1.8/10-D12J-C
厂家：	muRata
描述：	暂无描述电源电路
文件：	总12页 (文件大小：385K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

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