TL1464I

QUAD PULSE-WIDTH-MODULATION CONTROL CIRCUIT

SLVS266 – FEBRUARY 2000

1

POST OFFICE BOX 655303

Transistor

Reference Supply

Transistor

description

The TL1464I incorporates on a single monolithic chip all the functions required in the construction of a

pulse-width-modulation control circuit. Designed primarily for power supply control, the TL1464I contains an

on-chip 1.5 V regulator, four error amplifiers, an oscillator, two dead-time comparators, undervoltage lockout

circuitry, short circuit protection, standby control circuitry, and output circuits.

The external speed-up capacitors provide exceptional rise and fall time performance for the PNP power

transistor.

The TL1464I operates from 3.1 V supply voltage and 2 pair of four-outputs (CH-1/CH-3, CH-2/CH-4 the same

period) at the inverse phase of each other. As a result, the TL1464I provides high-efficiency power supply.

FUNCTION TABLE

INPUTS

OUTPUT FUNCTIONS

STANDBY

STANDBY-2 TO4

VREF

OUTPUT-1

OUTPUT-2

OUTPUT-3

OUTPUT-4

VI ≤ 0.4 V

VI ≤ 0.4 V, VI ≥ 2.4 V

L

OFF

OFF

OFF

OFF

VI ≥ 24 V

VI ≥ 2.4 V

H

ON

ON

ON

ON

VI ≥ 2.4 V

VI ≥ 0.4 V

H

ON

See Note

See Note

See Note

NOTE: When the STANDBY input is high (

≥ 2.4 V), OUTPUT-2 to 4 are controlled individually. If STANDBY-2 input is low

(

≤ 0.4 V), OUTPUT-2 is turned off. When CH-2 standby mode is released, CH-2 can do the soft-start function.

Copyright

© 2000, Texas Instruments Incorporated

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.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.