SC4524SETRT View Datasheet(PDF) - Semtech Corporation

Part Name

Description

MFG CO.

SC4524SETRT

Programmable Frequency, 2A Output 30V Step-Down Switching Regulator

Semtech Corporation 

POWER MANAGEMENT

Applications Information

VIN

POWER

STAGE

GMP = 8Ω-1

V COMP

R5

C6

C5

G28M0AµΩ=-1-

FB

+

RO

1.6MΩ

1V

VOLTAGE

REFERENCE

C11 R1

I OUT

V OUT

ESR

ROUT

C1

R2

Figure 10. Simplified Control Loop Equivalent Circuit

Gain

SC4524

GM A R O 

R2

R1 + R2



T( j ω)

GM

A

R

5



R

R2

1 +R

2



G M P R OUT

ωCC 1ROUT

n

v COMP

v OUT

1

ROC 5

ωp1

1

R5C 5

ωZ 1

n

ROUT C1

ωp2

1

R5C 6

ω

ωC

ωp3 ω S

2

Control- to-Output

Transfer Function

Figure 11. Bode Plots of Control-to-Ouput, Output-to-Control and the Overall Loop

Gain. Control-to-output transfer function is shown with two poles near

half the switching frequency ωS.

© 2006 Semtech Corp.

17

www.semtech.com

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