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SC1102A

Synchronous Voltage Mode Controller for Distributed Power Supply Applications

Semtech Corporation 

SC1102/SC1102A

POWER MANAGEMENT

Application Circuit

Typical 12V Application Circuit with Bootstrapped BSTH

+5V

R1

R2

1k

1.74k

PWRGD

OVP

C1

opt.

C2

0.1

R4

10

U1

SC1102

1 VCC

GND 14

2 PWRGD

SS/SHDN 13

R3

1k

3 OVP

VREF 12

4 OCSET

SENSE 11

5

D1

MBR0520 6

PHASE

DRVH

BSTH 10

BSTL 9

7 PGND

DRVL 8

D2

MBRA130

C3

0.1

SHDN

VREF

C4

1.0

R5

3.9

R6

2.2

Q1

STP40NE

Q2

STP40NE

+

C5

10.0

C6

270/16V

C7

270/16V

C8

Vin 12V

270/16V

_

R8

127

C9

L1

1.0

4uH

D3

MBRD1035

Optional

C10

180/4V

R9

205*

C11

180/4V

C12

180/4V

C13

180/4V

+

C14

180/4V

Vout=3.3V*

_

NOTE:

*) Vout = 1.265 x (1+R9/R8)

 2006 Semtech Corp.

7

www.semtech.com

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