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UTC 3521

PWM CONTROLLER WITH SUPERVISORY

CIRCUIT FOR SWITCHING POWER

SUPPLY

DESCRIPTION

UTC

3521

PWM controller is designed for switching mode

power supply for PCs etc. It provides all the functions similar

to combinations of industrial 494 plus 3510 circuits.

CMOS IC

FEATURES

* Over-voltage protection for 3.3V, 5V and 12V with delay

* Under-voltage detection for 3.3V, 5V and 12V with delay

* Remote ON/OFF function

* Power good circuitry for PCs.

DIP-16

*Pb-free plating product number: 3521L

PIN CONFIGURATION

V33

V5

V12

PT

GND

CT

C1

C2

1

2

3

4

5

6

7

8

UTC 3521

16

15

14

13

12

11

10

9

VADJ

OPNEGIN

OPOUT

V

CC

DET

PG

TPG

REM

PIN DESCRIPTION

PIN NO.

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

PIN NAME

V33

V5

V12

PT

GND

CT

C1

C2

REM

TPG

PG

DET

VCC

OPOUT

OPNEGIN

VADJ

TYPE

I

I

I

I

P

O

O

I

O

I

P

O

I

I

FUNCTIONS

OVP/UVP INPUT FOR 3.3V

OVP/UVP INPUT FOR 5V

OVP/UVP INPUT FOR 12V

ADDITIONAL OVP PROTECTION

GROUND

CAP FOR OSCIILATION FREQUENCY

OUTPUT 1

OUTPUT 2

REMOTE ON/OFF PIN.

POWER GOOD DELAY TIME SETTING

POWER GOOD SIGNAL OUT.

POWER GOOD SIGNAL DETECTION INPUT

SUPPLY VOLTAGE FOR IC

OP AMP OUTPUT

OP AMP NEGATIVE INPUT

VOLTAGE ADJUST PIN

UTC

UNISONIC TECHNOLOGIES CO., LTD.

1

QW-R502-034,A

www.unisonic.com.tw

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