TL497A

SWITCHING VOLTAGE REGULATORS

SLVS009D – JUNE 1976 – REVISED JULY 1999

8

POST OFFICE BOX 655303

APPLICATION INFORMATION

3-Term

Reg < 12 V

Switching

Circuit

Control

14

13

TL497A

5

VO

VI

VI

VO

R2

1 k

Ω

R1

Q2

10 mA

RCL

Vreg

14

13

5

TL497A

CURRENT LIMIT FOR EXTENDED INPUT CONFIGURATION

Q1

R

CL +

V

BE(Q1)

I

limit (PK)

R1

)

V

I

I

B(Q2)

R2

+ Vreg * 1 10 kW

Control

DESIGN EQUATIONS

Switching

Circuit

EXTENDED INPUT CONFIGURATION WITHOUT CURRENT LIMIT

3-Term

Reg < 12 V