SEMICONDUCTOR

TECHNICAL DATA

FA494AP/AF

BIPOLAR LINEAR INTEGRATED CIRCUIT

Voltage-Mode PWM Controller IC

The FA494AP/AF 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, this device

offers the systems engineer the flexibility to tailor the power supply control

circuitry to a specific application.

The FA494AP/AF contains two error amplifiers, an on-chip adjustable

oscillator, a dead-tme control(DTC) comparator, a pulse-steering control

flip-flop, a 5-V, 5%-precision requlator, and output-control circuits.

The error amplifiers exhibit a common-mode voltage range from -0.3V

provides approximately 5% dead time.

The on-chip oscillator may be bypassed by terminating RT to the

reference output and providing a sawtooth input to CT, or it may drive

the common circuits in synchronous multiple-rail power supplies.

The uncommitted output transistors provide either common- emitter or

emitter-follower output capability. The FA494AP/AF provides for push-

pull or single-ended output operation, which may be selected through

the output-control function.

The architecture of this device prohibits the possibility of either output

being pulsed twice during push-pull operation.

FEATURES

Completed PWM Power Control Circuitry.

Uncommitted Outputs for 200mA Sink or Source Current.

Output Control Selects Single-Ended or Push-Pull Operation.

Internal Circuitry Prohibits Double Pulse at Either Output.

Variable Dead Time Provides Control Over Total Range.

Internal Regulator Provides a Stable 5V Reference Supply With 5% Tolerance.

Circuit Architecture Allows Easy Synchronization.

9

1

8

Θ

DIP-16

A

d

P

D

W

T

DIM MILLIMETERS

A

B

D

T

P

d

G

H

L

3 8 0 3

0 - 15

1 52 0 1

W

19 3 0 2

6 45 0 2

0 46 0 1

0 50 MIN

3 3 0 3

2 54

0 25+0 1/-0 05

7 62

Θ

+

_

+

_

+

_

+

_

+

_

+

_

MAXIMUM RATINGS (Ta=25

)

SOP-16

L

1

8

9

16

P

D

A

0 20+0 1/-0 05

P

T

1 27

MILLIMETERS

0 4 0 1

0 15+0 1/-0 05

9 88 0 2

B2

G

H

L

D

A

B1

DIM

6 00 0 3

1 63 0 2

0 65 0 2

3 94 0 2

+

_

+

_

+

_

+

_

+

_

+

_

ITEM

SYMBOL

RATING

UNIT

Supply Voltage

41

V

Error Amplifier Input Voltage

V

Collector Output Voltage

41

V

Collector Output Current

250

mA

Power

Consumption

FAC494AP

750

mW

FAC494AF

400

Operating Temperature

-20

85

Storage Temperature

-25

125

INPUT TO

OUTPUT CTRL

OUTPUT FUNCTION

Single-ended or paralled output

Normal push-pull operation

FUNCTION TABLE

2008. 8. 11

1/6

Revision No : 0

16