24

4251b12f

LTC4251B/LTC4251B-1/

LTC4251B-2

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

©LINEAR TECHNOLOGY CORPORATION 2012

LT 0112 • PRINTED IN USA

+

LTC4251B

UV/OV

TIMER

GATE

SENSE

1

2

3

4

5

6

LOAD

–48RTN

–48RTN

(SHORT PIN)

R1

402k

1%

10Ω

0.01Ω

R3

22Ω

R2

32.4k

1%

–48V

82nF

C1

10nF

22nF

1μF

100μF

10k

500mW

Q1

IRF540

4251b12 TA02

PUSH-

RESET

S1

4

3

2

1

**DIODES, INC.

†RECOMMENDED FOR HARSH ENVIRONMENTS

†

DDZ13B**

+

LTC4251B-1

UV/OV

TIMER

GATE

SENSE

1

2

3

4

5

6

LOAD

–48RTN

–48RTN

(SHORT PIN)

R1

442k

1%

10Ω

0.02Ω

R2

34.8k

1%

–48V

220nF

C1

10nF

22nF

1μF

D1

BZX84C36

100μF

10k

500mW

R3

31.6k

R4

22Ω

Q1

IRF540S

4251b12 TA03

4

3

2

1

**DIODES, INC.

†RECOMMENDED FOR HARSH ENVIRONMENTS

†

DDZ13B**

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PART NUMBER

DESCRIPTION

COMMENTS

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Fast Active Current Limiting with Drain Accelerated Response,

Supplies from –15V

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Supplies from –15V

Figure 16. –48V/5A Application with Reverse SENSE Pin Limiting and Push-Reset at TIMER Pin

Figure 17. Power-Limited Circuit Breaker Application