SC4524BSETRT 데이터 시트보기 (PDF) - Semtech Corporation

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SC4524BSETRT

18V 2A Step-Down Switching Regulator

Semtech Corporation 

SC4524B

Block Diagram

COMP

6

FB

7

ROSC

3

-

+ EA

+

SLOPE

COMP +

S

+

V1

FREQUENCY

FOLDBACK

+

PWM

-

OSCILLATOR

+

ISEN

-

OC

+

ILIM

20mV

-

BST

8

S

Q

R

CLK

IN

2

6.1mW

POWER

TRANSISTOR

SS/EN

5

+

A1

-

R

1.23V

R

1V

1.9V

REFERENCE

& THERMAL

SHUTDOWN

FAULT

SOFT-START

AND

OVERLOAD

HICCUP

CONTROL

1

SW

1

GND

4

Figure 2. SC4524B Block Diagram

SS/EN

1.9V

IC

2mA

+-B4

B1

1V/2.15V

S

Q

R

B2

OVERLOAD

FAULT

ID

3.5mA

_S

Q

R

B3

OC

PWM

Figure 3. Soft-start and Overload Hiccup Control Circuit



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