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TL494 Series Datasheet

TL494

Pulse-Width-Modulation Control Circuits

The TL494 device incorporates all the functions required in the construction of a pulse-widthmodulation (PWM) control circuit on a single chip. Designed primarily for power-supply control, this device offers the flexibility to tailor the power-supply control circuitry to a specific application. It contains two error amplifiers, an on-chip adjustable oscillator, a dead-time control (DTC) comparator, a pulse-steering control flip-flop, a 5-V, 5%-precision regulator, and output-control circuits.

TL494 Pin Configuration and Function

TL494 Pin Configuration and Function


Pin Number

Pin Name

Description

1

1IN+

Noninverting input to error amplifier 1

2

1IN-

Inverting input to error amplifier 1

3

FEEDBACK

Input pin for feedback

4

DTC

Dead-time control comparator input

5

CT

Capacitor terminal used to set the   oscillator frequency

6

RT

Resistor terminal used to set the   oscillator frequency

7

GND

Ground Pin

8

C1

The collector terminal of BJT output 1

9

E1

The emitter terminal of BJT output 1

10

E2

The emitter terminal of BJT output 2

11

C2

The collector terminal of BJT output 2

12

VCC

Positive Supply

13

OUTPUT CTRL

Selects single-ended/parallel output or   push-pull operation

14

REF

The 5-V reference regulator output

15

2IN-

Inverting input to error amplifier 2

16

2IN+

Noninverting input to error amplifier 2


TL494 Series Datasheet

Part No
Picture
Manufacturer
Package
Description
Datasheet
TL494CN
TL494CN
TI
SOIC, PDIP

Voltage Mode PWM Controller 40V 200mA 300kHz 16Pin PDIP Tube

TL494CDR
TL494CDR
TI
SOIC, PDIP

Voltage Mode PWM Controller 40V 200mA 300kHz 16Pin SOIC T/R

TL494IN
TL494IN
TI
SOIC, PDIP

Voltage Mode PWM Controller 40V 200mA 300kHz 16Pin PDIP Tube

TL494CD
TL494CD
TI
SOIC, PDIP

Voltage Mode PWM Controller 40V 200mA 300kHz 16Pin SOIC Tube

TL494IDR
TL494IDR
TI
SOIC

Voltage Mode PWM Controller 40V 200mA 300kHz 16Pin SOIC T/R

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