TL497ACN datasheet(5/20 Pages) TI

Teilenummer	TL497ACN

Bauteilbeschribung	500-mA PEAK STEP-UP STEP-DOWN,INVERTING SWITCHING VOLTAGE REGULATOR

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Hersteller	TI [Texas Instruments]

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TL497A

500mA PEAK STEPUP, STEPDOWN, INVERTING SWITCHING VOLTAGE REGULATOR

SLVS009F − JUNE 1976 − REVISED FEBRUARY 2005

5

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

APPLICATION INFORMATION

VI

L

14

13

10

8

7

6

5

4

3

2

1

TL497A

R2 = 1.2 k

Ω

R1

VO

CO

BASIC CONFIGURATION

(Peak Switching Current = I(PK) < 500 mA)

VI

RCL

L

R1

8

10

13

14

12

3

4

5

EXTENDED POWER CONFIGURATION

(using external transistor)

TL497A

DESIGN EQUATIONS

I

(PK) +

2I

O

max

V

O

V

I

L(

mH) +

V

I

(PK)

ton (ms)

C

T

(pF)

[ 12 ton (ms)

R1

+ (V

O

–1.2 V) k

W

Choose L (50 to 500

µH), calculate

ton (25 to 150 µs)

R

CL +

0.5 V

I

(PK)

C

O

(

mF) [ ton(ms)

V

I

V

O

I

(PK) )

I

O

V

ripple

(PK)

CT

R2 = 1.2 k

Ω

VO

CO

CT

RCL

Figure 1. Positive Regulator, Step-Up Configurations

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