TL496C, TL496Y

9-V POWER-SUPPLY CONTROLLERS

SLVS012B – AUGUST 1978 – REVISED AUGUST 1995

Copyright

4–1

POST OFFICE BOX 655303

Transformer-Coupled-Input Operation

(1 Inductor, 1 Capacitor, 1 Diode)

description

The TL496C power-supply control circuit is designed to provide a 9-V regulated supply from a variety of input

sources. Operable from a 1- or 2-cell battery input, the TL496C performs as a switching regulator with the

addition of a single inductor and filter capacitor. When ac coupled with a step-down transformer, the TL496C

operates as a series regulator to maintain the regulated output voltage and, with the addition of a single catch

diode, time shares to recharge the input batteries.

The design of the TL496C allows minimal supply current drain during standby operation (125

µA typical). With

most battery sources, this allows a constant bias to be maintained on the power supply. This makes power

instantly available to the system, thus eliminating power-up sequencing problems.

AVAILABLE OPTIONS

PACKAGED DEVICES

CHIP

TA

SURFACE MOUNT

(D)

PLASTIC DIP

(P)

FORM

(Y)

0

°C to 70°C

TL496CD

TL496CP

TL496Y

functional block diagram

Switching

Voltage

Regulator

Control

9-V

Series

Regulator

2

2C INPUT

T INPUT

1C INPUT

3

4

GND

GND

5

7

See Note 1

OUTPUT

FEEDBACK

SW

1

6

8

NOTE 1: Terminals 5 and 7, though connected together internally, must both be terminated to ground to ensure proper circuit operation.

1

2

3

4

8

7

6

5

FEEDBACK

2C INPUT

1C INPUT

T INPUT

OUTPUT

GND

SW

GND

D OR P PACKAGE

(TOP VIEW)

Terminals 5 and 7 are connected together internally.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.