SC4524D 데이터 시트보기 (PDF) - Semtech Corporation

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SC4524D

18V 2A Step-Down Switching Regulator

Semtech Corporation 

SC4524D

Block Diagram

COMP

6

FB

7

ROSC

3

SS/EN

5

-

+ EA

+

SLOPE

COMP +

+

V1

FREQUENCY

FOLDBACK

+

PWM

-

OSCILLATOR

+

ISEN

-

OC

+

ILIM

18mV

-

BST

8

S

Q

R

CLK

+

A1

-

R

1.2V

R

1V

1.9V

REFERENCE

& THERMAL

SHUTDOWN

FAULT

SOFT- START

AND

OVERLOAD

HICCUP

CONTROL

Figure 2. SC4524D Block Diagram

IN

2

5.5m

POWER

TRANSISTOR

1

SW

GND

4

SS/EN

1.9V

IC

2.4 PA

- B4

+

B1

1V/2.15V

S

Q

R

B2

OVERLOAD

FAULT

ID

3.9

PA

_S

Q

R

B3

OC

PWM

Figure 3. Soft-start and Overload Hiccup Control Circuit



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