TL1453C

DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUIT

SLVS039A – FEBRUARY 1990 – REVISED DECEMBER 1990

1

POST OFFICE BOX 655303

Over Total Range

Reference Supply

description

The TL1453C incorporates the functions required in the construction of two pulse-width-modulation control

circuits on a single monolithic chip. Designed primarily for power supply control, the TL1453C contains an

on-chip 2.5-V regulator, two error amplifiers, an adjustable oscillator, two dead-time comparators, undervoltage

lockout circuitry, and dual common-emitter output transistor circuits.

The uncommitted output transistors provide common-emitter output capability for each controller. The internal

amplifiers exhibit a common-mode voltage range from 1.05 V to 1.45 V. The dead-time control comparator has

no offset unless externally altered and may be used to provide 0% to 100% dead time. The on-chip oscillator

control circuit feature inhibits the output until the internal circuitry is operational.

The TL1453C is characterized for operation from –20

°C to 85°C.

functional block diagram

15

13

14

12

5

4

3

16

SCP

2 IN–

2 IN+

2 FEEDBACK

1 FEEDBACK

1 IN–

1 IN+

REF

GND

8

1 DEAD-TIME CONTROL

2 DEAD-TIME CONTROL

2.5 V

2.5 V

UVLO†

11

6

2 OUTPUT

1 OUTPUT

10

7

PWM Comparator 2

PWM Comparator 1

Error Amp.2

1.4 V

2 V

Oscillator

Triangle

Error Amp.1

2.5 V

Voltage

Reference

Vref = 2.5 V

VCC

12

CT

RT

2

9

1

† UVLO = Undervoltage Lockout Protection

Copyright

© 1990, 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.

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

ERROR

IN+

AMPLIFIER 1 IN–

1 FEEDBACK

1 DEAD-TIME CONTROL

1 OUTPUT

GND

REF

SCP

IN+

ERROR

IN– AMPLIFIER 2

2 FEEDBACK

2 DEAD-TIME CONTROL

2 OUTPUT

N OR NS PACKAGE

(T0P VIEW)

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