LSN-2.5/10-D5B_技术文档

Single Output LSN-10A Models

Non-Isolated, 5VIN, 1-3.8VOUT

10 Amp DC/DC In SIP Package

FEATURES

ꢀ

Industry-standard SIP pinout

Shorter (2.0" vs. 2.5") package length

4.5-5.5V input range

Typical units

1/1.2/1.5/1.8/2/2.5/3.3/3.8VOUT @ 10A

Non-isolated, fully synchronous,

300kHz, buck topology

PRODUCT OVERVIEW

ꢀ

Outstanding performance:

Murata Power Solutions' new LSN D5 Series SIP’s

efﬁciency (to 95%), low noise (10mVp-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 over-

current detection, continuous short-circuit protec-

tion, an output-voltage trim function, a remote on/

off control pin (pull high to disable), thermal shut-

down, and a sense pin. High efﬁciency enables

the LSN D5's to deliver rated output currents of

10 Amps at ambient temperatures to +71°C with

no air ﬂow (natural convection).

If your low-voltage, high-current requirements

make the use of inefﬁcient linear regulators

impractical, take a look at one of C&D’s easy-to-

use, low-cost LSN SIP’s. All devices are UL/IEC/

EN60950-1 certiﬁed and EMC compliant. UL, CB,

HALT and EMC reports are available upon request.

Selected models are RoHS compliant.

v

1% setpoint accuracy

(single-in-line packages) are non-isolated DC/DC

converters that accept a 5V input (4.5V to 5.5V

input range) and deliver 1V, 1.2V, 1.5V, 1.8V, 2V,

2.5, 3.3 or 3.8V outputs at 10 Amps. LSN D5 SIP’s

take on-board 5V power and convert it, with the

highest efﬁciency in the smallest space, to any

lower voltage required by today’s current-hungry

DSP’s, ASIC’s and CPLD’s.

The miniature size of LSN D5's makes them

ideal for true point-of-use power processing. Ver-

tical-mount packages occupy a mere 0.7 square

inches (440 sq. mm), and they are available in

industry-standard and Tyco-compatible pinout.

Horizontal-mount packages ("H" sufﬁx) are only

0.34 inches (8.6mm) high.

v Efﬁciencies to 95% @ 10 Amps

v Noise as low as 10mVp-p

v Stable no-load operation

v Trimmable output voltage

ꢀ

Remote on/off and sense pins

Thermal shutdown

No derating to +71°C, natural convection

UL/IEC/EN60950-1 certiﬁed

EMC compliant

The LSN's best-in-class power density is

achieved with a fully synchronous, ﬁxed-frequency

(300kHz), buck topology that also delivers: high

For full details go to

www.murata-ps.com/rohs

+OUTPUT

(1,2,4)

+INPUT

(7,8)

10.57

~

+SENSE

220μF

44μF

47.1μF

470μF

(3)

(100.1μF) (330μF)

COMMON

(5)

COMMON

(6)

CURRENT

SENSE

V

CC

PWM

ON/OFF

CONTROL

(11)

REFERENCE &

ERROR AMP

CONTROLLER

TRIM

(10)

Typical topology is shown.

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

path is through the +Output pin and not the +Sense pin.

Values in parenthesis for 3.3V models only.

Figure 1. Simpliﬁed Schematic

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MDC_LSN-10A D5 Models.B01 Page 1 of 15

Single Output LSN-10A Models

Non-Isolated, 5VIN, 1-3.8VOUT

10 Amp DC/DC In SIP Package

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

VOUT

(Volts)

IOUT

(Amps)

Model

Typ.

Max.

Line

Load

(mA/A)

Min.

Typ.

LSN-1/10-D5

1

10

35

0.1ꢀ

0.25ꢀ

5

4.5-5.5

50/2.43

50/2.85

50/3.48

50/4.09

50/4.51

50/5.50

50/7.25

50/8.0

83ꢀ

85ꢀ

87ꢀ

89ꢀ

89.5ꢀ

91ꢀ

92ꢀ

86ꢀ

88ꢀ

89ꢀ

91ꢀ

B7/B7x, P59

LSN-1.2/10-D5

LSN-1.5/10-D5

LSN-1.8/10-D5

LSN-2/10-D5

1.2

1.5

1.8

2

90ꢀ

92ꢀ

91.5ꢀ

92.5ꢀ

94ꢀ

93.5ꢀ

94ꢀ

LSN-2.5/10-D5

LSN-3.3/10-D5

LSN-3.8/10-D5

2.5

3.3

3.8

95.5ꢀ

96ꢀ

95ꢀ

96ꢀ

~ Typical at TA = +25°C under nominal line voltage and full-load conditions, unless otherwise

noted. All models are tested and speciﬁed with external 22μF input and output capacitors.

These 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.

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

tions. Regulation speciﬁcations describe the output-voltage deviation as the line voltage or

load is varied from its nominal/midpoint value to either extreme.

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

Avaiilable with RoHS (Reduction of Hazardous Substances) compliance.

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

ordering.

Ripple/Noise (R/N) is tested/speciﬁed over a 20MHz bandwidth and may be reduced with

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

PART NUMBER STRUCTURE

L SN - 1.8 / 10 - D5 B H J

- C

Output

Conﬁguration:

L = Unipolar

RoHS-6

compliant*

J Sufﬁx:

Low Voltage

Reversed Pin

Vertical Mount

Non-Isolated SIP

H Sufﬁx:

Horizontal Mount

Nominal Output Voltage:

1, 1.2, 1.5, 1.8, 2, 2.5, 3.3, or 3.8V

Maximum Rated Output

Current in Amps

B Sufﬁx:

No Remote Sense

(Pin 3 removed)

See page 15 for details.

Input Voltage Range:

D5 = 4.5 to 5.5 Volts

(5V nominal)

Note: Not all model number

combinations are available.

Contact MPS.

* Contact Murata Power

Solutions for availability.

www.murata-ps.com

Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000

MDC_LSN-10A D5 Models.B01 Page 2 of 15

Single Output LSN-10A Models

Non-Isolated, 5VIN, 1-3.8VOUT

10 Amp DC/DC In SIP Package

MECHANICAL SPECIFICATIONS

0.34

(8.64)

0.35

(8.89)

2.00

(50.80)

0.20

(5.08)

2.00

(50.80)

0.21

(5.33)

0.17

(4.32)

ISOLATING

PAꢀ

0.05

(1.27)

0.50

(12.7)

0.50

(12.7)

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 ꢀIA.

(0.762 0.025)

0.05

(1.27)

0.110

(2.79)

0.030 0.001 ꢀIA.

(0.762 0.025)

0.05

(1.27)

0.360

(9.14)

1.000

(25.40)

0.400

(10.16)

0.500

(12.70)

1.000

(25.40)

0.400

(10.16)

0.500

(12.70)

0.046

(1.17)

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)

Case B7A

Horizontal Mounting

0.56

(14.22)

0.53

(13.46)

0.34

(8.64)

LAYOUT PATTERN

TOP VIEW

0.25

(6.35)

Case B7

Vertical Mounting

(Standard)

0.50

(12.7)

0.45

(11.43)

LAYOUT PATTERN

TOP VIEW

RECOMMENꢀEꢀ

COPPER PAꢀ

ON PCB (0.55 SQ. IN.)

0.36

(9.14)

2.00

(50.80)

0.20

(5.08)

0.17

(4.32)

0.50

(12.7)

1 2 3 4 5

6 7 8 9 10 11

0.046

(1.17)

0.030 0.001 ꢀIA.

(0.762 0.025)

0.05

(1.27)

Dimensions in inches (mm)

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)

Case B7B

Reverse Pin

Vertical Mounting

(Tyco-compatible)

LAYOUT PATTERN

TOP VIEW

0.36

(9.14)

0.306

(7.8)

I/O Connections

Pin Function P59*

5

Function P59* Pin Function P59*

1

2

3

4

+Output

+Sense *

+Output

Common

+Input

9

No Pin

V^OUTTrim

Pin 3 (+Sense) removed

for "B" sufﬁx models.

6

10

11

7

On/Off Control

8

+Input

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MDC_LSN-10A D5 Models.B01 Page 3 of 15

Single Output LSN-10A Models

Non-Isolated, 5VIN, 1-3.8VOUT

10 Amp DC/DC In SIP Package

Performance/Functional Speciﬁcations

Typical @ TA = +25°C under nominal line voltage and full-load conditions unless noted. ~

Input

~ All models are tested/speciﬁed with external 22μF input/output capacitors.These caps accommo-

date our test equipment and may not be required to achieve speciﬁed performance in your applica-

tions. 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 application of

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

Input Voltage Range

4.5 to 5.5 Volts (5V nominal)

Input Current:

Normal Operating Conditions

Inrush Transient

Standby/Off Mode

See Ordering Guide

0.014A²sec

3mA

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

I/O Filtering and Noise Reduction.

Output Short-Circuit Condition

70mA average

Input Reﬂected Ripple Current

Input Filter Type

50mAp-p

Capacitive (264μF)

None

Absolute Maximum Ratings

Overvoltage Protection

Reverse-Polarity Protection

Undervoltage Shutdown

On/Off Control

Input Voltage:

None

Continuous or transient

7 Volts

+VIN

None

On/Off Control (Pin 11)

On = open (internal pulldown)

Off = +2.8V to +VIN (<3mA)

Input Reverse-Polarity Protection

Output Overvoltage Protection

Output Current

None

Output

Current limited. Devices can withstand

sustained output short circuits without

damage.

VOUT Accuracy (50ꢀ load)

1ꢀ maximum

~

Minimum Loading

No load

Maximum Capacitive Load

10,000μF (electrolytic)

10ꢀ

Storage Temperature

–40 to +125°C

+300°C

V^OUTTrim Range

Lead Temperature (soldering, 10 sec.)

~

Ripple/Noise (20MHz BW)

See Ordering Guide

3ꢀ over line/load/temperature

See Ordering Guide

Total Accurcacy

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.

Efﬁciency

Overcurrent Detection and Short-Circuit Protection:

Current-Limiting Detection Point

Short-Circuit Detection Point

SC Protection Technique

Short-Circuit Current

17 (12.5-22) Amps

98ꢀ of VOUT set

Hiccup with auto recovery

400mA average

Dynamic Characteristics

Transient Response (50ꢀ load step) 50μsec to 2ꢀ of ﬁnal value

Start-Up Time:

V^INto VOUT

On/Off to V^OUT

7msec

6msec

Switching Frequency

300kHz (+40kHz, –50kHz)

Environmental

MTBF: Bellcore, ground ﬁxed, TA = +25°C,

full power, natural convection,

+55°C component temperature

2.1 million hours

Without Derating (Natural convection) –40 to +63/71°C (model dependent)

Operating Temperature: (Ambient)

With Derating

See Derating Curves

+115°C

Thermal Shutdown

Physical

Dimensions

See Mechanical Speciﬁcations

Open-frame, single-in-line (SIP)

Package

Pin Dimensions/Material

0.03" (0.76mm) round copper with

gold plate over nickel underplate

Weight

0.3 ounces (8.5g)

Flamability Rating

Safety

UL94V-0

UL/cUL/IEC/EN 60950-1, CSA-C22.2 No. 234

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Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000

MDC_LSN-10A D5 Models.B01 Page 4 of 15

Single Output LSN-10A Models

Non-Isolated, 5VIN, 1-3.8VOUT

10 Amp DC/DC In SIP Package

TECHNICAL NOTES

Return Current Paths

Input Fusing

The LSN D5 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 (speciﬁcally pin 6).

Most applications and or safety agencies require the installation of fuses at the

inputs of power conversion components. LSN D5 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 15 Amps should be

installed within the ungrounded input path to the converter.

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.

I/O Filtering and Noise Reduction

All models in the LSN D5 Series are tested and speciﬁed with external 22μF

input and output capacitors. These capacitors are necessary to accommo-

date our test equipment and may not be required to achieved desired per-

formance in your application. The LSN D5'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.

Safety Considerations

LSN D5 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 speciﬁcations (usually

UL/IEC/EN60950-1).

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.

In particular, the LSN D5's input capacitors are speciﬁed for low ESR and

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

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

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

output caps has minimal effect on output noise.

Input Overvoltage and Reverse-Polarity Protection

LSN D5 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 "instantaneous"

duration can cause permanent damage to these devices.

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

using ﬁltering techniques, the simplest being the installation of external

I/O caps.

Start-Up Time

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 induc-

tive source impedances can greatly affect system stability. Your speciﬁc

system conﬁguration may necessitate additional considerations.

The VIN to VOUT Start-Up Time is the interval between the time at which a ramp-

ing input voltage crosses the lower limit of the speciﬁed input voltage range

(4.5 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.

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.

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

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

additional external output capacitors. Output capacitors function as true

ﬁlter elements and should be selected for bulk capacitance, low ESR, and

appropriate 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.

Remote Sense

LSN D5 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 conse-

quently 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 techniques

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

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

load and layout conditions. Our Applications Engineers can recommend

potential solutions and discuss the possibility of our modifying a given

device’s internal ﬁltering to meet your speciﬁc requirements. Contact our

Applications Engineering Group for additional details.

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Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000

MDC_LSN-10A D5 Models.B01 Page 5 of 15

Single Output LSN-10A Models

Non-Isolated, 5VIN, 1-3.8VOUT

10 Amp DC/DC In SIP Package

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

and Sense, we recommend installation of a 1000pF capacitor close to the

converter.

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

cal 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.

The sense function is capable of compensating for voltage drops between

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

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

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

"released" once the input has stabilized.

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

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 functions

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

beyond the LSN's speciﬁed rating. Therefore:

For a controlled start-up of one or more LSN-D5's, or if several output volt-

ages 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.

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

Output Overvoltage Protection

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 D5 SIP Series DC/DC converters do not incorporate output overvoltage

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= VIN). 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.

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.

Output Overcurrent Detection

On/Off Control and Power-up Sequencing

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 com-

ponents such as inductors, FET's and diodes are at the highest risk. LSN D5

SIP Series DC/DC converters incorporate an output overcurrent detection and

shutdown function that serves to protect both the power converter and its load.

The On/Off Control pin may be used for remote on/off operation. LSN D5 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 (+2.8V to +V^IN), as shown in Figure 2 and 2a.

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

or if the output voltage drops to less than 98% of it original value, the LSN D5'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 70mA. Once the

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

+INPUT

5k7

1.1k7

ON/OFF

CONTROL

0.75k7

COMMON

Output Voltage Trimming

Allowable trim ranges for each model in the LSN D5 SIP Series are 10%.

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.

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

+INPUT

5k7

2k7

+OUTPUT

1.1k7

+INPUT

ON/OFF

CONTROL

0.75k7

20k7

5-10

Turns

TRIM

LOAD

COMMON

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

Figure 3.Trim Connections Using a Trimpot

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MDC_LSN-10A D5 Models.B01 Page 6 of 15

Single Output LSN-10A Models

Non-Isolated, 5VIN, 1-3.8VOUT

10 Amp DC/DC In SIP Package

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/°C to ensure stability.

Output Reverse Conduction

Many DC/DC converters 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 "freewheel-

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

+OUTPUT

Trim

LSN D5 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.

+INPUT

ꢀown

LOAD

TRIM

COMMON

Trim Up

COMMON

Note: Install either a ﬁxed trim-up resistor or a ﬁxed trim-down resistor

depending upon desired output voltage.

Thermal Considerations and Thermal Protection

Figure 4.Trim Connections Using Fixed Resistors

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 D5 SIP's under known ambient-temperature and air-ﬂow

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

ably deliver a required output current at known temperatures.

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

resistor values. Recall, untrimmed devices are guaranteed to be p1% accurate.

Adjustment beyond the speciﬁed 10% adjustment range is not recom-

mended.

The highest temperatures in LSN D5 SIP's occur at their output inductor,

whose heat is generated primarily by I²R losses. The above curves were devel-

oped using thermocouples to monitor the inductor temperature and 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.

Trim Equations

1.62(VO – 0.8)

Model

– 1

RT_DOWN(k7) =

1 – VO

1.296

VO – 1

LSN-1/10-D5

– 1

R^T_UP(k7) =

In all cases below, the DUT's were vertical-mount models, and the direction

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

2.49(VO – 0.8)

1.2 – VO

– 2.37

– 4.99

RT_DOWN(k7) =

R^T_UP(k7) =

LSN-1.2/10-D5

As you may deduce from the above curves and can observe in the efﬁciency

curves on the next page, LSN D5 SIP's are more efﬁcient at lower current

levels. Also, I²R losses in the output inductor are signiﬁcantly less at lower

currents. Consequently, LSN D5 SIP's deliver very impressive temperature

performance if operating at less than full load.

1.992

– 2.37

VO – 1.2

2.37(VO – 0.8)

VO _NOM– VO

RT_DOWN(k7) =

RT_UP(k7) =

LSN-1.5/10-D5

LSN-1.8/10-D5

LSN-2/10-D5

1.896

– 4.99

LSN-2.5/10-D5

Lastly, when LSN D5 SIP's are installed in system boards, they are obviously

subject to numerous factors and tolerances not taken into account above.

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.

VO – VO

NOM

7.5(VO – 0.8)

VO _NOM– VO

RT_DOWN(k7) =

RT_UP(k7) =

LSN-3.3/10-D5

LSN-3.8/10-D5

6

– 4.99

VO – VO

NOM

Thermal Performance for "H" Models

7.5(VO – 0.8)

3.8 – V^O

Enhanced thermal performance can be achieved when LSN D5 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 con-

ditions may vary, however our tests indicate this conﬁguration delivers a 16°C

to 22°C improvement in ambient operating temperatures.

– 13

RT_DOWN(k7) =

RT_UP(k7) =

6

– 13

V^O– 3.8

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_LSN-10A D5 Models.B01 Page 7 of 15

Single Output LSN-10A Models

Non-Isolated, 5VIN, 1-3.8VOUT

10 Amp DC/DC In SIP Package

Typical Performance Curves for LSN D5 SIP Series

LSN-1/10-D5

LSN-1.2/10-D5

Output Current vs. Ambient Temperature

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

Output Current vs. Ambient Temperature

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

10

8

10

8

Natural Convection

6

100 lfm

4

200 lfm

2

0

–40

0

–40

0

60

70

80

90

100

110

0

60

70

80

90

100

110

Ambient Temperature (oC)

LSN-1.8/10-D5 & LSN-2/10-D5

Output Current vs. Ambient Temperature

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

LSN-1.5/10-D5

Output Current vs. Ambient Temperature

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

10

8

10

8

Natural Convection

6

100 lfm

200 lfm

100 lfm

200 lfm

4

2

0

–40

0

–40

0

60

70

80

90

100

110

0

60

70

80

90

100

110

Ambient Temperature (oC)

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MDC_LSN-10A D5 Models.B01 Page 8 of 15

Single Output LSN-10A Models

Non-Isolated, 5VIN, 1-3.8VOUT

10 Amp DC/DC In SIP Package

Typical Performance Curves for LSN D5 SIP Series

LSN-1/10-D5

Efficiency vs. Line Voltage and Load Current

LSN-2.5/10-D5 & LSN-3.3/10-D5

Output Current vs. Ambient Temperature

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

90

88

86

84

82

80

78

76

74

10

8

Natural Convection

6

V

IN = 4.5V

100 lfm

4

V

IN = 5V

200 lfm

V

IN = 5.5V

2

0

–40

0

60

70

80

90

100

110

Ambient Temperature (oC)

1

2

3

4

5

6

7

8

9

10

Load Current (Amps)

LSN-1.2/10-D5

Efficiency vs. Line Voltage and Load Current

LSN-1.5/10-D5

Efficiency vs. Line Voltage and Load Current

92

90

88

86

84

82

80

78

93

91

89

87

85

83

81

V

IN = 4.5V

V

IN = 4.5V

VIN = 5V

V

IN = 5.5V

V

IN = 5.5V

1

2

3

4

5

6

7

8

9

10

1

2

3

4

5

6

7

8

9

10

Load Current (Amps)

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Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000

MDC_LSN-10A D5 Models.B01 Page 9 of 15

Single Output LSN-10A Models

Non-Isolated, 5VIN, 1-3.8VOUT

10 Amp DC/DC In SIP Package

Typical Performance Curves for LSN D5 SIP Series

LSN-1.8/10-D5

LSN-2/10-D5

Efficiency vs. Line Voltage and Load Current

94

93

92

91

90

89

88

87

86

85

84

95

94

93

92

91

90

89

88

87

86

85

V

IN = 4.5V

IN = 5V

VIN = 4.5V

V

VIN = 5V

V

IN = 5.5V

VIN = 5.5V

1

2

3

4

5

6

7

8

9

10

1

2

3

4

5

6

7

8

9

10

Load Current (Amps)

LSN-2.5/10-D5

Efficiency vs. Line Voltage and Load Current

LSN-3.3/10-D5

Efficiency vs. Line Voltage and Load Current

96

95

94

93

92

91

90

89

88

87

97

96

95

94

93

92

91

90

V

IN = 4.5V

VIN = 4.5V

VIN = 5V

VIN = 5.5V

1

2

3

4

5

6

7

8

9

10

1

2

3

4

5

6

7

8

9

10

Load Current (Amps)

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MDC_LSN-10A D5 Models.B01 Page 10 of 15

Single Output LSN-10A Models

Non-Isolated, 5VIN, 1-3.8VOUT

10 Amp DC/DC In SIP Package

Typical Performance Curves for LSN D5 SIP Series

Input Inrush Current

(VIN = 5V, 4300μF as Input Switch )

Input Reflected Ripple Current

(VIN = 5V, VOUT = 3.3V/10A, Input Filter = 220μF/12μH/33μF, COUT = NA

20μsec/div

2μsec/div

Input Reflected Ripple Current

(VIN = 5V, VOUT = 3.3V/10A, CIN = 220μF, No External COUT )

Power-Up From VIN

(VIN = 5V, VOUT = 3.3V/10A, CIN = 220μF, No External COUT)

1μsec/div

2msec/div

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MDC_LSN-10A D5 Models.B01 Page 11 of 15

Single Output LSN-10A Models

Non-Isolated, 5VIN, 1-3.8VOUT

10 Amp DC/DC In SIP Package

Typical Performance Curves for LSN D5 SIP Series

Power-Up From Enable

(VIN = 5V, VOUT = 3.3V/10A, CIN = 220μF, No External COUT)

Output Ripple/Noise

(VIN = 5V, VOUT = 3.3V, No Load, No External Capacitor)

2msec/div

1μsec/div

Output Ripple/Noise

Dynamic Load Response

(VIN = 5V, VOUT = 3.3V, Full Load, COUT = 220μF)

(VIN = 5V, 100% to 50% Load Step, No External COUT)

1μsec/div

50μsec/div

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MDC_LSN-10A D5 Models.B01 Page 12 of 15

Single Output LSN-10A Models

Non-Isolated, 5VIN, 1-3.8VOUT

10 Amp DC/DC In SIP Package

Typical Performance Curves for LSN D5 SIP Series

Output Ripple/Noise

(VIN = 5V, VOUT = 3.3V, Full Load, No External Capacitor)

Dynamic Load Response

(VIN = 5V, VOUT = 3.3V, 100% to 0% Load Step, No External COUT)

1μsec/div

50μsec/div

Output Hiccup

Input Current with Short Circuit at Output

(VIN = 5V, VOUT = Short, IIN = 70mA Average,

IOUT = 400mA Average, CIN = 220μF, No External COUT)

IOUT = 400mA Average, CIN = 220μF, COUT = NA, Period = 25msec )

5msec/div

2.5msec/div

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MDC_LSN-10A D5 Models.B01 Page 13 of 15

Single Output LSN-10A Models

Non-Isolated, 5VIN, 1-3.8VOUT

10 Amp DC/DC In SIP Package

Typical Performance Curves for LSN D5 SIP Series

Short-Circuit Output Current

(VIN = 5V, VOUT = Short, IIN = 70mA Average,

IOUT = 400mA Average, CIN = 220μF, COUT = NA, Period = 25msec)

500μsec/div

www.murata-ps.com

Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000

MDC_LSN-10A D5 Models.B01 Page 14 of 15

Single Output LSN-10A Models

Non-Isolated, 5VIN, 1-3.8VOUT

10 Amp DC/DC In SIP Package

EMI CONDUCTED/RADIATED EMISSIONS

If you’re designing with EMC in mind, please note that all of MPS’s LSN D5 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 emis-

sions are tested to the limits of FCC Part 15, Class B and CISPR 22 (EN 55022),

Class B. Correlation to other speciﬁcations can be supplied upon request. For

corresponding emissions plots to FCC and CISPR 22 for model LSN-5/10-D12

(the highest possible output power model) and for LSN-2/10-D3 (representing

the highest input current models) see LSN-10A D12 and LSN-10A D3 data

sheets for reference. These respective curves are representative of all LSN

models. Contact MPS’s Applications Engineering Department for more details.

Functional Options

Remote Sense Pin Removed ("B" sufﬁx)

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.

Horizontal Mounting ("H" sufﬁx)

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

including the "pad." For "H" models, a thermally conductive, electrically

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 12.7

x 0.23mm). This conﬁguration can signiﬁcantly improve thermal performance.

See Thermal Derating for details.

Reversed pin vertical mounting ("J" sufﬁx)

PART NUMBER STRUCTURE

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 Tyco's "keep out area."

L SN - 1.8 / 10 - D5 B H J

- C

Output

Conﬁguration:

L = Unipolar

Other Options and Modiﬁcations

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

trol. Contact MPS directly to discuss these and other possible modiﬁcations.

RoHS compliant

Low Voltage

J Sufﬁx:

Reversed Pin

Vertical Mount

Non-Isolated SIP

Examples

LSN-1.8/10-D5

LSN-1.8/10-D5B

LSN-1.8/10-D5H

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

Vertical-mount. Pin 3 (+Sense) removed. No pin 9.

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

Nominal Output Voltage:

1, 1.2, 1.5, 1.8, 2, 2.5, 3.3, or 3.8V

H Sufﬁx:

Horizontal Mount

Maximum Rated Output

Current in Amps

B Sufﬁx:

No Remote Sense

(Pin 3 removed)

LSN-1.8/10-D5BH Horizontal-mount. Pin 3 (+Sense) removed. No pin 9.

LSN-1.8/10-D5J

No pin 9.

Reverse pin vertical-mount. Sense function on pin 3.

Note: Not all model number

combinations are available.

Contact Murata Power Solutions.

Input Voltage Range:

D5 = 4.5 to 5.5 Volts (5V nominal)

RoHS compliance ("-C" sufﬁx)

Selected models use materials which are compatible with the Reduction of

Hazardous Substances (RoHS) directive. Contact Murata Power Solutions.

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

Tucson (AZ), Tel: (800) 547 2537, email: sales@murata-ps.com

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: ped.munich@murata-ps.com

Murata Power Solutions, Inc.

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

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

China:

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

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

ISO 9001 REGISTERED

3/6/08

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 notice.

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MDC_LSN-10A D5 Models.B01 Page 15 of 15


型号：	LSN-2.5/10-D5B
厂家：	muRata
描述：	DC-DC Regulated Power Supply Module, 1 Output, 25W, Hybrid, SIP-11/9 电源电路
文件：	总15页 (文件大小：356K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

LSN-2.5/10-D5B [MURATA]

相关型号：

LSN-2.5/10-D5B-C

LSN-2.5/10-D5BH-C

LSN-2.5/10-D5BJ

LSN-2.5/10-D5BJ-C

LSN-2.5/10-D5H

LSN-2.5/10-D5J

LSN-2.5/16-D12

LSN-2.5/16-W3

LSN-2.5/16-W3H

LSN-2.5/16-W3J-C

LSN-2/10-D12

LSN-2/10-D12B