© Semiconductor Components Industries, LLC, 2005

June, 2005 − Rev. 6

1

Publication Order Number:

TL494/D

TL494, NCV494

SWITCHMODE™ Pulse Width

Modulation Control Circuit

The TL494 is a fixed frequency, pulse width modulation control

circuit designed primarily for SWITCHMODE power supply control.

Features

and Control Changes

unless otherwise noted.)

Rating

Symbol

Value

Unit

Power Supply Voltage

42

V

Collector Output Voltage

42

V

Collector Output Current

(Each transistor) (Note 1)

500

mA

Amplifier Input Voltage Range

−0.3 to +42

V

1000

mW

Thermal Resistance, Junction−to−Ambient

80

°C/W

Operating Junction Temperature

125

°C

Storage Temperature Range

−55 to +125

°C

Operating Ambient Temperature Range

TL494B

TL494C

TL494I

NCV494B

−40 to +125

0 to +70

− 40 to +85

−40 to +125

°C

Derating Ambient Temperature

45

°C

Maximum ratings are those values beyond which device damage can occur.

Maximum ratings applied to the device are individual stress limit values (not

normal operating conditions) and are not valid simultaneously. If these limits are

exceeded, device functional operation is not implied, damage may occur and

reliability may be affected.

1. Maximum thermal limits must be observed.

*For additional information on our Pb−Free strategy and soldering details, please

download the ON Semiconductor Soldering and Mounting Techniques

Reference Manual, SOLDERRM/D.

http://onsemi.com

MARKING

DIAGRAMS

SOIC−16

D SUFFIX

CASE 751B

See detailed ordering and shipping information in the package

dimensions section on page 4 of this data sheet.

ORDERING INFORMATION

TL494xDG

AWLYWW

x

= B, C or I

A

= Assembly Location

WL

= Wafer Lot

YY, Y

= Year

WW, W

= Work Week

G

= Pb−Free Package

1

16

PDIP−16

N SUFFIX

CASE 648

*This marking diagram also applies to NCV494.

PIN CONNECTIONS

Ground

C1

1

Inv

Input

C2

Q2

E2

E1

1

≈ 0.1 V

Oscillator

5.0 V

REF

(Top View)

Noninv

Input

Inv

Input

Output

Contro

l

Noninv

Input

Compen/PWN

Comp Input

Deadtime

Control

Error

Amp

+

−

2

3

4

5

6

7

89

10

11

12

13

14

15

16

2

Error

Amp

+

−

Q1

TL494xN

AWLYYWWG

*

1

16