The TL494AP is a fixed frequency, pulse width modulation control

circuit designed primarily for SWITCHMODE power supply control/

•

• Complete Pulse Width Modulation Control Circuitry

•

• On– Chip Oscillator with Master or Slave Operation

•

• On– Chip Error Amplifiers

•

• On– Chip 5.0 V Reference

•

• Adjustable Deadtime Control

•

• Uncommitted Output Transistors Rated to 500 mA Source or

Sink

•

• Output Control for Push– Pull or Single– Ended Operation

•

• Undervoltage Lockout

PIN ASSIGNMEN

ORDERING INFORMATION

Plastic

TL494

Chip

LOGIC DIAGRAM

Pin 7 = GND

noninv. input

inv. input

feedback

dead time control

C

T

R

T

gnd

collector 1

noninv. input

inv. input

ref. output

output control

Vcc

collector 2

emitter 2

emitter 1

1

2

3

5

6

7

89

10

11

12

14

15

16

5

6

13

8

9

11

10

15

3

7 12 14

16

2

1

4

dead time control

error amp 1

error amp 2

PWM comparator

pulce steering flip

flop

output control

reference

regulator

oscillator

T

&

TL494AP Switchmode Pulse - Width - Modulation Control Circuit