LM3753_1_技术文档

National Semiconductor

Application Note 2021

Robert Sheehan, Michael Null

December 15, 2009

LM3753/54 Evaluation

Board

QUICK SETUP PROCEDURE

Introduction

Step 1: Use an input power supply with at least 30A current

capability. Connect the positive output of the power supply to

the VIN terminal T1. Connect the negative output of the power

supply to the input GND terminal T2.

The LM3753/54 evaluation board is designed to provide the

design engineer with a fully functional power converter based

solution using two LM3753 or LM3754 2-Phase Buck Con-

trollers. This evaluation board produces an output voltage of

1.2 V at 25A per phase for a total of 100A. The switching fre-

quency for the converter is set to 300 kHz per phase, for an

effective 1.2 MHz at the input and output. The gate signals for

each controller’s outputs are 180 degree out of phase, with

the two controllers having a 90 degree phase shift from each

other. The printed circuit board consists of 4 layers of FR4

material with 2 ounce copper on all layers. This application

note contains the evaluation board schematics, Bill-of-Mate-

rials (BOM) and a quick setup procedure. Refer to the

LM3753/54 datasheet for complete circuit design information.

Step 2: Connect a load with 100A capability to the VOUT ter-

minal T3 and GND terminal T4.

Step 3: (LM3753 only) Connect a secondary power supply

to the TRACK terminal TP13 and GND terminal TP2. Set the

power supply voltage to 3.3V. Since the LM3753 is configured

such that VOUT follows the TRACK input, VOUT cannot

come up without applying a voltage to TRACK.

Step 4: Ensure that the Load Pulse switch SW1 is in the cen-

ter OFF position. Check that the current limit trimmers R18

and R26 are turned fully clockwise for maximum output cur-

rent. J1, J3, J5 and J7 should be installed, with J2, J4, J6 and

J8 open.

The performance of the evaluation board is as follows:

Input Range

: 6V to 18V

Step 5: Set VIN to 12 V with no load being applied. Turn on

the input power supply (followed by the secondary power

supply for the LM3753 TRACK). The output voltage should

be in regulation with a nominal value of 1.2V.

Output Voltage

Output Current

Switching Frequency

Load Regulation

Board Size

: 1.2V ± 1%

: 0A to 100A

: 300 kHz

Step 6: Slowly increase the load while monitoring the output

voltage. The output voltage should remain in regulation up to

the full load current of 100A.

: 0.1%

: 4.2 x 5.4 x 0.063 inches

Step 7: Slowly vary the input voltage from 6V to 18V. The

output voltage should remain in regulation with a nominal val-

ue of 1.2V.

Powering and Loading

Considerations

Read this entire page prior to attempting to power the evalu-

ation board.

30111201

FIGURE 1. Basic Test Setup for the LM3753/54 Evaluation Board

301112

www.national.com

DCR and RESISTOR SENSE

Board Configuration

The LM3753/54 is delivered with the resistor sense option

selected. To configure the board for DCR (Inductor DC Re-

sistance) sensing, remove J1, J3, J5 and J7. Turn the current

limit trimmers R18 and R26 fully counter-clockwise for the

lower DC resistance. Short the power connections J2, J4, J6

and J8. Holes for the power jumpers will accommodate #14

AWG or 2 x #18 AWG solid copper wires. #2-56 hardware

may also be used for the power connections. Due to the tight

spacing, stagger the screws and nuts on the top and bottom;

wrap #18 AWG solid copper wire around the hardware on the

top side and tighten. Take care to avoid damaging adjacent

components, particularly Q14-Q17 on the bottom side. Brass

jumpers such as those used on terminal blocks should be

avoided since the resistance is four times that of copper.

LM3753 TRACK

The LM3753 evaluation board is configured such that VOUT

follows the TRACK input. This configuration will not allow

VOUT to come up without applying a voltage to TRACK. In

order to produce 1.2V on the output, the TRACK pin must be

connected to a secondary 3.3V power supply.

To prevent current limit during startup, the rise time of the 3.3V

TRACK signal should be longer than 100 μs.

LM3754 SOFT-START

The LM3754 evaluation board is configured such that VOUT

follows the SS signal, which is set by C12 and an internal 10

μA current source. This allows the LM3754 to operate on its

own, with a single power supply connected to VIN.

LOAD PULSE GENERATOR

An on-board load pulse generator allows for easy evaluation

of the output voltage transient response. The LPI (Load Pulse

In) and LPO (Load Pulse Out) terminals provide the interface

to the load pulse generator. Setting SW1 to EXT connects LPI

to LPO, which then allows the load pulse generator to be driv-

en by LPI with an external 5V logic signal. Setting SW1 to INT

allows the load pulse generator to be driven with an internally

generated 1 ms pulse at 5% duty cycle.

OUTPUT VOLTAGE RIPPLE

Output voltage ripple measurement should be taken directly

across the output capacitor C66 between terminals TP3 and

TP4. Care must be taken to minimize the loop area between

the scope probe tip and the ground lead in order to minimize

noise in the measurement. This can be achieved by removing

the probe’s spring tip and ground lead and then wrap a bare

wire around the scope probe shaft. The bare wire should be

in contact with the probe shaft since this is the ground lead

for the probe. The measurement can be taken by connecting

the bare wire onto the ground side of the capacitor and the

probe tip onto the positive side of the capacitor. Figure 2

shows a diagram of this measurement technique.

J9 selects the amount of load. With J9 open, Load Branch 1

is engaged to draw 1.2V / 0.05Ω = 24A. With J9 shorted, Load

Branch 1 and Load Branch 2 are engaged to draw 1.2V /

0.025Ω = 48A. TP41 through TP44 provide monitoring of the

load step.

R59, C61 and the gate impedance of Q14-Q17 set the slew

rate. With J9 open, R59 = 51Ω and C61 = 0.01 μF, the slew

rate is 24A / 1 μs. With J9 open, R59 = 51Ω and C61 open,

the slew rate is 24A / 200 ns. Results are shown in the Typical

Performance Characteristics.

OVER TEMPERATURE PROTECTION

An LM26LV provides over temperature protection should the

PC board exceed 105°C. This shuts down switching by pulling

the /FAULT bus low. Normal operation resumes when the

board cools below 100°C. A VTEMP terminal provides an

analog voltage which is inversely proportional to temperature.

Refer to the LM26LV datasheet for complete design informa-

tion.

30111202

FIGURE 2. Output Voltage Ripple Measurement Setup

VCC1, VCC2 and VDD

The VCC and VDD terminals provide monitoring points for the

on-board voltages. For the evaluation board, VDD is gener-

ated by an NPN linear regulator controlled by the LM3753/54.

To demonstrate the maximum power stage efficiency, a 5V

current limited external supply may be used for VDD. Ex-

treme care must be exercised when applying an external

voltage to the VDD terminal. Under no circumstances

should a voltage be applied to VDD while VIN < 5V, as

damage to the LM3753/54 will occur. To protect U1 and U2,

the circuit may be modified by placing small Schottky diodes

in series with R2 and R16 to block the reverse voltage. Refer

to the LM3753/54 datasheet for complete circuit design infor-

mation.

EXTERNAL CLOCK SYNCHRONIZATION

A SYNCIN terminal has been provided on the evaluation

board in order to synchronize the converter to an external

clock or other fixed frequency signal from 225 kHz to 375 kHz.

Refer to the LM3753/54 datasheet for complete information.

POWER GOOD

A PGOOD terminal provides monitoring of the Power Good

signal. When PGOOD is high at VCC1, the output voltage is

within the Power Good window.

MARGIN

A MARGIN terminal has been provided on the evaluation

board in order to adjust the output voltage by ±5%. Shorting

the MARGIN terminal to GND will adjust the output up 5%.

Shorting the MARGIN terminal to VOUT will adjust the output

down 5%.

ACTIVE LOADS

Many constant-current types of active loads can exhibit an

initial short circuit, which is sustained well beyond the normal

soft-start cycle. To avoid current limit during startup, wait until

the output voltage is up before turning on the load. Using an

active load with a constant-resistance mode will avoid this

startup timing issue.

www.national.com

2

Typical Performance Characteristics

Efficiency with 5V External VDD and DCR Sense

Efficiency with VDD Linear Regulator and Resistor Sense

30111203

30111204

Output Load Transient +24A / 1 μs

Output Load Transient −24A / 1 μs

30111205

30111206

Output Load Transient +24A / 200 ns

Output Load Transient −24A / 200 ns

30111207

30111208

3

www.national.com

Startup from Enable

Switching at 12V Input

Phase Matching

Restart from Fault

Output Voltage Ripple

V_IAVEvs I_OUT

30111209

30111210

30111211

30111212

30111213

30111214

www.national.com

4

Evaluation Board Schematic

5

www.national.com

6

7

www.national.com

TABLE 1. Bill of Materials for LM3753 Evaluation Board

Designator

Value

Package

Description

Manufacturer

Part Number

QTY

C1

470uF

SMT

AL, 25V, 20%, 0.06 Ohm ESR

Panasonic

EEE-FP1E471AP

1

Radial G

C2, C15

1uF

0603

0805

Ceramic, X7R, 16V, 10%

TDK

C1608X7R1C105K

2

4

C3, C10, C16, C18 4.7uF

MuRata

GRM21BR71C475

KA73L

C4

C5

C6

0.047uF

100pF

0603

Ceramic, X7R, 25V, 10%

Ceramic, C0G/NP0, 50V, 5%

Ceramic, X7R, 50V, 10%

TDK

C1608X7R1E473K

C1608C0G1H101J

1

4700pF

MuRata

GRM188R71H472

KA01D

C7

2200pF

0603

Ceramic, X7R, 50V, 10%

MuRata

GRM188R71H222

KA01D

1

C8, C13, C14, C20, 1000pF

C21, C55, C62,

C63, C64, C65,

C67

GRM188R71H102

KA01D

11

C9, C11, C17, C19, 0.22uF

C59

0603

1210

Ceramic, X7R, 25V, 10%

Taiyo Yuden

TMK107B7224KA-

T

5

8

C22, C23, C24,

C25, C26, C27,

C28, C29

4.7uF

TMK325B7475KN-

T

C30, C31, C32,

C33

680pF

0.15uF

22uF

0603

1210

Ceramic, C0G/NP0, 50V, 5%

Ceramic, X7R, 25V, 10%

Ceramic, X7R, 16V, 10%

TDK

C1608C0G1H681J

4

8

C34, C35, C36,

C37

MuRata

GRM188R71E154

KA01D

C38, C39, C42,

C43, C46, C47,

C50, C51

GRM32ER71C226

KE18L

C40, C41, C44,

C45, C48, C49,

C52, C53

220uF

0.1uF

UE

SP, 4V, 20%, 0.005 Ohm ESR

Ceramic, X7R, 25V, 10%

Panasonic

MuRata

EEF-SE0G221R

8

2

C56, C68

0603

GRM188R71E104

KA01D

C58

C60

2.2uF

0805

0603

Ceramic, X7R, 16V, 10%

Ceramic, X7R, 50V, 10%

TDK

C2012X7R1C225K

1

470pF

MuRata

GRM188R71H471

KA01D

C61

C66

0.01uF

1uF

0603

1206

Ceramic, X7R, 50V, 10%

Ceramic, X7R, 25V, 10%

TDK

AVX

C1608X7R1H103K

12063C105KAT2A

CMDSH05-4

1

9

D1, D2, D3, D4, D5, 0.47V

D6, D7, D8, D9

SOD-323

Vr = 40V, Io = 0.5A, Vf = 0.47V

Central

Semiconductor

D14

1.25V

SOD-123

Vr = 100V, Io = 0.15A, Vf = 1.25V

Diodes Inc.

1N4148W-7-F

2EA13

1

2

H1, H2

H3, H4

Mach Screw, Round, #10-32 x 3/8, Brass

Mach Screw, Round, #1/4-20 x 1/2,

Brass

2EA30

H5, H6

H7, H8

Lock Nut, #10-32, Stainless Steel

Lock Nut, #1/4-20, Brass

1EY35

1FA58

4DFG1

2

4

H9, H10, H11, H12

Machine Screw, Round, #4-40 x 1/4,

Nylon

H13, H14, H15,

H16

Standoff Hex 0.5"L #4-40 Nylon

Keystone

1902C

4

J1, J3, J5, J7, J9

L1, L2, L3, L4

1x2

Header, TH, 100mil, 1x2, Tin plated

Power Beads, 440nH, 0.32 mOhm

Samtec Inc.

TSW-102-07-T-S

5

4

440nH

PA1513

Pulse Engineering PA0513.441NLT

www.national.com

8

Designator

Value

Package

Description

Manufacturer

Part Number

QTY

LED1, LED2

Green

Power

TOPLED

w/lens

0.114W, 3.8V

OSRAM

LT E63C-

BACB-35-L-Z

2

LED3

Red

Power

TOPLED

w/lens

0.1075W, 2.15V

OSRAM

LS E63F-DBFA-1-

Z

1

P1

P2

Q1

Header, 24-Pin, Right Angle

Receptacle 24-Pin, Right Angle

NPN, 8A, 80V

Tyco Electronics

1-87230-2

5535512-3

CJD44H11

1

NPN

25V

DPAK

Central

Semiconductor

Q2, Q5, Q8, Q11

PowerPAK

SO-8

30A, 8.5nC, 7 mOHM

50A, 20 nC, 3 mOHM

Vishay-Siliconix

SiR850DP

SiR892DP

4

Q3, Q4, Q6, Q7,

Q9, Q10, Q12,

Q13, Q14, Q15,

Q16, Q17

PowerPAK

SO-8

12

R1, R7, R8, R60,

R61, R62, R80

10k

2.2

0603

5%, 0.1W

Vishay-Dale

CRCW060310K0J

NEA

7

6

R2, R16, R31, R32,

R33, R34

CRCW06032R20J

NEA

R3, R55

2.4k

1.0k

1.0

CRCW06032K40J

NEA

2

R4, R5

CRCW06031K00J

NEA

2

R6, R35, R36, R37,

R38, R51, R52,

R53, R54, R58,

R79

CRCW06031R00J

NEA

11

R9, R13

3.01k

240

0603

0.1%, 0.1W

5%, 0.1W

1%, 0.1W

Yageo America

Vishay-Dale

RT0603BRD073K

01L

2

1

2

R10

CRCW0603240RJ

NEA

R11

6.2k

CRCW06036K20J

NEA

R12

30.1k

35.7k

10.0k

78.7k

CRCW060330K1F

KEA

R14

CRCW060335K7F

KEA

R15

CRCW060310K0F

KEA

R17, R25

CRCW060378K7F

KEA

R18, R26

R19, R27

200

191

TS53Y

0603

Pot 5mm Sq Cermet

1%, 0.1W

Vishay-Sfernice

Vishay-Dale

TS53YL201

2

CRCW0603191RF

KEA

R20, R21, R28

R22

4.02k

1.37k

0

0603

1%, 0.1W

5%, 0.1W

1%, 0.1W

Vishay-Dale

CRCW06034K02F

KEA

3

1

2

4

CRCW06031K37F

KEA

R24, R30

CRCW06030000Z

0EA

R39, R42, R45,

R48

5.90k

CRCW06035K90F

KEA

9

www.national.com

Designator

Value

Package

Description

Manufacturer

Part Number

QTY

R40, R43, R46,

R49

10.5k

0603

1%, 0.1W

Vishay-Dale

CRCW060310K5F

KEA

4

R41, R44, R47,

R50

0.001

470k

12k

51

WSK2512

0603

1%, 1W

5%, 0.1W

1%, 1W

Vishay-Dale

Panasonic

WSK25121L000F

EA

4

1

R56

R57

R59

CRCW0603470KJ

NEA

0603

CRCW060312K0J

NEA

1

0603

CRCW060351R0J

NEA

1

R63, R64, R65,

R66, R67, R68,

R69, R70, R71,

R72, R73, R74

0.3

2512

ERJ-1TRQFR30U

12

R75, R76, R77,

R78

1.00k

0603

1%, 0.1W

Vishay-Dale

CRCW06031K00F

KEA

4

R101

120

47k

5%, 0.25W

Panasonic

MuRata

ERD-S2TJ121V

1

4

RT1, RT2, RT3,

RT4

Thermistor, 47K, 2%, B25/50 4050,

0.1W

NCP18WB473J03

RB

SH-J1, SH-J3, SH-

J5, SH-J7, SH-J9

1x2

Shunt, 100mil, Tin plated, Black

Amp

2-382811-1

5

SW1

T1, T2

T3, T4

Switch, DPDT, 3 Position

Terminal 50A Lug

NKK

G3T23AP-RO

CB35-36-CY

CB70-14-CY

1598-2

1

2

50A

90A

Panduit

Terminal 90A Lug

2

TP1, TP2, TP3,

TP4, TP5, TP6,

Triple

Terminal, Turret, TH, Triple

Keystone

Electronics

21

TP7, TP8, TP9,

TP10, TP11, TP12,

TP13, TP14, TP38,

TP39, TP40, TP41,

TP42, TP43, TP44

TP15, TP16, TP18, White

TP19, TP20, TP21,

TP22, TP24, TP25,

TP26, TP27, TP28,

TP29, TP30, TP32,

TP34, TP36

Test Point, TH, Multipurpose, White

Keystone

Electronics

5012

17

TP17, TP23, TP31, Black

TP33, TP35, TP37

Test Point, TH, Multipurpose, Black

Multi-Phase Buck Controller

Keystone

Electronics

5011

6

2

1

U1, U2

LM3753 SQA32A

National

Semiconductor

LM3753SQ

U3

LM26LV SDB06A

105°C

1.6V, LLP-6 Factory Preset

Temperature Switch and Temperature

Sensor

National

Semiconductor

LM26LVCISD-105

U4

U5

LMC555 MUA08A

CMOS Timer

National

Semiconductor

LMC555CMM

LM27222M

1

LM2722

2

M08A

High-Speed 4.5A Synchronous

MOSFET Driver

National

Semiconductor

www.national.com

10

TABLE 2. Bill of Materials for LM3754 Evaluation Board

Designator

Value

Package

Description

Manufacturer

Part Number

QTY

C1

470uF

SMT

AL, 25V, 20%, 0.06 Ohm ESR

Panasonic

EEE-FP1E471AP

1

Radial G

C2, C15

1uF

0603

0805

Ceramic, X7R, 16V, 10%

TDK

C1608X7R1C105K

2

4

C3, C10, C16, C18 4.7uF

MuRata

GRM21BR71C475

KA73L

C4

C5

C6

0.047uF

100pF

0603

Ceramic, X7R, 25V, 10%

Ceramic, C0G/NP0, 50V, 5%

Ceramic, X7R, 50V, 10%

TDK

C1608X7R1E473K

C1608C0G1H101J

1

4700pF

MuRata

GRM188R71H472

KA01D

C7

2200pF

0603

Ceramic, X7R, 50V, 10%

MuRata

GRM188R71H222

KA01D

1

C8, C13, C14, C20, 1000pF

C21, C55, C62,

C63, C64, C65,

C67

GRM188R71H102

KA01D

11

C9, C11, C17, C19, 0.22uF

C59

0603

1210

Ceramic, X7R, 25V, 10%

Taiyo Yuden

MuRata

TMK107B7224KA-

T

5

3

8

C12, C56, C68

0.1uF

GRM188R71E104

KA01D

C22, C23, C24,

C25, C26, C27,

C28, C29

4.7uF

Taiyo Yuden

TMK325B7475KN-

T

C30, C31, C32,

C33

680pF

0.15uF

22uF

0603

1210

Ceramic, C0G/NP0, 50V, 5%

Ceramic, X7R, 25V, 10%

Ceramic, X7R, 16V, 10%

TDK

C1608C0G1H681J

4

8

C34, C35, C36,

C37

MuRata

GRM188R71E154

KA01D

C38, C39, C42,

C43, C46, C47,

C50, C51

GRM32ER71C226

KE18L

C40, C41, C44,

C45, C48, C49,

C52, C53

220uF

UE

SP, 4V, 20%, 0.005 Ohm ESR

Panasonic

EEF-SE0G221R

8

C58

C60

2.2uF

0805

0603

Ceramic, X7R, 16V, 10%

Ceramic, X7R, 50V, 10%

TDK

C2012X7R1C225K

1

470pF

MuRata

GRM188R71H471

KA01D

C61

C66

0.01uF

1uF

0603

1206

Ceramic, X7R, 50V, 10%

Ceramic, X7R, 25V, 10%

TDK

AVX

C1608X7R1H103K

12063C105KAT2A

CMDSH05-4

1

9

D1, D2, D3, D4, D5, 0.47V

D6, D7, D8, D9

SOD-323

Vr = 40V, Io = 0.5A, Vf = 0.47V

Central

Semiconductor

D14

1.25V

SOD-123

Vr = 100V, Io = 0.15A, Vf = 1.25V

Diodes Inc.

1N4148W-7-F

2EA13

1

2

H1, H2

H3, H4

Mach Screw, Round, #10-32 x 3/8, Brass

Mach Screw, Round, #1/4-20 x 1/2,

Brass

2EA30

H5, H6

H7, H8

Lock Nut, #10-32, Stainless Steel

Lock Nut, #1/4-20, Brass

1EY35

1FA58

4DFG1

2

4

H9, H10, H11, H12

Machine Screw, Round, #4-40 x 1/4,

Nylon

H13, H14, H15,

H16

Standoff Hex 0.5"L #4-40 Nylon

Keystone

1902C

4

J1, J3, J5, J7, J9

L1, L2, L3, L4

1x2

Header, TH, 100mil, 1x2, Tin plated

Power Beads, 440nH, 0.32 mOhm

Samtec Inc.

TSW-102-07-T-S

5

4

440nH

PA1513

Pulse Engineering PA0513.441NLT

11

www.national.com

Designator

Value

Package

Description

Manufacturer

Part Number

QTY

LED1, LED2

Green

Power

TOPLED

w/lens

0.114W, 3.8V

OSRAM

LT E63C-

BACB-35-L-Z

2

LED3

Red

Power

TOPLED

w/lens

0.1075W, 2.15V

OSRAM

LS E63F-DBFA-1-

Z

1

P1

P2

Q1

Header, 24-Pin, Right Angle

Receptacle 24-Pin, Right Angle

NPN, 8A, 80V

Tyco Electronics

1-87230-2

5535512-3

CJD44H11

1

NPN

25V

DPAK

Central

Semiconductor

Q2, Q5, Q8, Q11

PowerPAK

SO-8

30A, 8.5nC, 7 mOHM

50A, 20 nC, 3 mOHM

Vishay-Siliconix

SiR850DP

SiR892DP

4

Q3, Q4, Q6, Q7,

Q9, Q10, Q12,

Q13, Q14, Q15,

Q16, Q17

PowerPAK

SO-8

12

R1, R7, R8, R60,

R61, R62, R80

10k

2.2

0603

5%, 0.1W

Vishay-Dale

CRCW060310K0J

NEA

7

6

R2, R16, R31, R32,

R33, R34

CRCW06032R20J

NEA

R3, R55

2.4k

1.0k

1.0

CRCW06032K40J

NEA

2

R4, R5

CRCW06031K00J

NEA

2

R6, R35, R36, R37,

R38, R51, R52,

R53, R54, R58,

R79

CRCW06031R00J

NEA

11

R9, R13

3.01k

240

0603

0.1%, 0.1W

5%, 0.1W

1%, 0.1W

Yageo America

Vishay-Dale

RT0603BRD073K

01L

2

1

2

R10

CRCW0603240RJ

NEA

R11

6.2k

CRCW06036K20J

NEA

R12

30.1k

78.7k

CRCW060330K1F

KEA

R17, R25

CRCW060378K7F

KEA

R18, R26

R19, R27

200

191

TS53Y

0603

Pot 5mm Sq Cermet

1%, 0.1W

Vishay-Sfernice

Vishay-Dale

TS53YL201

2

CRCW0603191RF

KEA

R20, R21, R28

R22

4.02k

1.37k

0

0603

1%, 0.1W

5%, 0.1W

1%, 0.1W

1%, 1W

Vishay-Dale

CRCW06034K02F

KEA

3

1

2

4

CRCW06031K37F

KEA

R24, R30

0603

CRCW06030000Z

0EA

R39, R42, R45,

R48

5.90k

10.5k

0.001

0603

CRCW06035K90F

KEA

R40, R43, R46,

R49

0603

CRCW060310K5F

KEA

R41, R44, R47,

R50

WSK2512

WSK25121L000F

EA

www.national.com

12

Designator

Value

Package

Description

Manufacturer

Part Number

QTY

R56

470k

0603

5%, 0.1W

Vishay-Dale

CRCW0603470KJ

NEA

1

R57

R59

12k

51

0603

2512

5%, 0.1W

1%, 1W

Vishay-Dale

Panasonic

CRCW060312K0J

NEA

1

CRCW060351R0J

NEA

R63, R64, R65,

R66, R67, R68,

R69, R70, R71,

R72, R73, R74

0.3

ERJ-1TRQFR30U

12

R75, R76, R77,

R78

1.00k

0603

1%, 0.1W

Vishay-Dale

CRCW06031K00F

KEA

4

R101

120

47k

5%, 0.25W

Panasonic

MuRata

ERD-S2TJ121V

1

4

RT1, RT2, RT3,

RT4

Thermistor, 47K, 2%, B25/50 4050,

0.1W

NCP18WB473J03

RB

SH-J1, SH-J3, SH-

J5, SH-J7, SH-J9

1x2

Shunt, 100mil, Tin plated, Black

Amp

2-382811-1

5

SW1

T1, T2

T3, T4

Switch, DPDT, 3 Position

Terminal 50A Lug

NKK

G3T23AP-RO

CB35-36-CY

CB70-14-CY

1598-2

1

2

50A

90A

Panduit

Terminal 90A Lug

2

TP1, TP2, TP3,

TP4, TP5, TP6,

TP7, TP8, TP9,

TP10, TP11, TP12,

TP14, TP38, TP39,

TP40, TP41, TP42,

TP43, TP44

Triple

Terminal, Turret, TH, Triple

Keystone

Electronics

20

TP15, TP16, TP18, White

TP19, TP20, TP21,

TP22, TP24, TP25,

TP26, TP27, TP28,

TP29, TP30, TP32,

TP34, TP36

Test Point, TH, Multipurpose, White

Keystone

Electronics

5012

17

TP17, TP23, TP31, Black

TP33, TP35, TP37

Test Point, TH, Multipurpose, Black

Multi-Phase Buck Controller

Keystone

Electronics

5011

6

2

1

U1, U2

LM3754 SQA32A

National

Semiconductor

LM3754SQ

U3

LM26LV SDB06A

105°C

1.6V, LLP-6 Factory Preset

Temperature Switch and Temperature

Sensor

National

Semiconductor

LM26LVCISD-105

U4

U5

LMC555 MUA08A

CMOS Timer

National

Semiconductor

LMC555CMM

LM27222M

1

LM2722

2

M08A

High-Speed 4.5A Synchronous

MOSFET Driver

National

Semiconductor

13

www.national.com

PCB Layout

www.national.com

14

15

www.national.com

16

17

www.national.com

18

19

www.national.com

For more National Semiconductor product information and proven design tools, visit the following Web sites at:

www.national.com

Products

www.national.com/amplifiers

Design Support

www.national.com/webench

Amplifiers

WEBENCH® Tools

App Notes

Audio

www.national.com/audio

www.national.com/timing

www.national.com/adc

www.national.com/interface

www.national.com/lvds

www.national.com/power

www.national.com/appnotes

www.national.com/refdesigns

www.national.com/samples

www.national.com/evalboards

www.national.com/packaging

www.national.com/quality/green

www.national.com/contacts

www.national.com/quality

www.national.com/feedback

www.national.com/easy

Clock and Timing

Data Converters

Interface

Reference Designs

Samples

Eval Boards

LVDS

Packaging

Power Management

Green Compliance

Distributors

Switching Regulators www.national.com/switchers

LDOs

www.national.com/ldo

www.national.com/led

www.national.com/vref

www.national.com/powerwise

Quality and Reliability

Feedback/Support

Design Made Easy

Applications & Markets

Mil/Aero

LED Lighting

Voltage References

PowerWise® Solutions

www.national.com/solutions

www.national.com/milaero

www.national.com/solarmagic

www.national.com/training

Serial Digital Interface (SDI) www.national.com/sdi

Temperature Sensors

PLL/VCO

www.national.com/tempsensors SolarMagic™

www.national.com/wireless

PowerWise® Design

University

THE CONTENTS OF THIS DOCUMENT ARE PROVIDED IN CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION

(“NATIONAL”) PRODUCTS. NATIONAL MAKES NO REPRESENTATIONS OR WARRANTIES WITH RESPECT TO THE ACCURACY

OR COMPLETENESS OF THE CONTENTS OF THIS PUBLICATION AND RESERVES THE RIGHT TO MAKE CHANGES TO

SPECIFICATIONS AND PRODUCT DESCRIPTIONS AT ANY TIME WITHOUT NOTICE. NO LICENSE, WHETHER EXPRESS,

IMPLIED, ARISING BY ESTOPPEL OR OTHERWISE, TO ANY INTELLECTUAL PROPERTY RIGHTS IS GRANTED BY THIS

DOCUMENT.

TESTING AND OTHER QUALITY CONTROLS ARE USED TO THE EXTENT NATIONAL DEEMS NECESSARY TO SUPPORT

NATIONAL’S PRODUCT WARRANTY. EXCEPT WHERE MANDATED BY GOVERNMENT REQUIREMENTS, TESTING OF ALL

PARAMETERS OF EACH PRODUCT IS NOT NECESSARILY PERFORMED. NATIONAL ASSUMES NO LIABILITY FOR

APPLICATIONS ASSISTANCE OR BUYER PRODUCT DESIGN. BUYERS ARE RESPONSIBLE FOR THEIR PRODUCTS AND

APPLICATIONS USING NATIONAL COMPONENTS. PRIOR TO USING OR DISTRIBUTING ANY PRODUCTS THAT INCLUDE

NATIONAL COMPONENTS, BUYERS SHOULD PROVIDE ADEQUATE DESIGN, TESTING AND OPERATING SAFEGUARDS.

EXCEPT AS PROVIDED IN NATIONAL’S TERMS AND CONDITIONS OF SALE FOR SUCH PRODUCTS, NATIONAL ASSUMES NO

LIABILITY WHATSOEVER, AND NATIONAL DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY RELATING TO THE SALE

AND/OR USE OF NATIONAL PRODUCTS INCLUDING LIABILITY OR WARRANTIES RELATING TO FITNESS FOR A PARTICULAR

PURPOSE, MERCHANTABILITY, OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY

RIGHT.

LIFE SUPPORT POLICY

NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR

SYSTEMS WITHOUT THE EXPRESS PRIOR WRITTEN APPROVAL OF THE CHIEF EXECUTIVE OFFICER AND GENERAL

COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:

Life support devices or systems are devices which (a) are intended for surgical implant into the body, or (b) support or sustain life and

whose failure to perform when properly used in accordance with instructions for use provided in the labeling can be reasonably expected

to result in a significant injury to the user. A critical component is any component in a life support device or system whose failure to perform

can be reasonably expected to cause the failure of the life support device or system or to affect its safety or effectiveness.

National Semiconductor and the National Semiconductor logo are registered trademarks of National Semiconductor Corporation. All other

brand or product names may be trademarks or registered trademarks of their respective holders.

For the most current product information visit us at www.national.com

National Semiconductor

Americas Technical

Support Center

National Semiconductor Europe

Technical Support Center

Email: europe.support@nsc.com

National Semiconductor Asia

Pacific Technical Support Center

Email: ap.support@nsc.com

National Semiconductor Japan

Technical Support Center

Email: jpn.feedback@nsc.com

Email: support@nsc.com

Tel: 1-800-272-9959

www.national.com


型号：	LM3753_1
厂家：	National Semiconductor
描述：	Evaluation Board evaluation board is designed to provide 评估板评估板旨在提供
文件：	总20页 (文件大小：1100K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

LM3753_1 [NSC]

相关型号：

LM3754

LM3754

LM3754SQ

LM3754SQ/NOPB

LM3754SQX

LM3754SQX/NOPB

LM3754_15

LM376

LM376JG4

LM376N

LM376N/B+

LM376P