© ASTEC Semiconductor

Description

The AS23xx is a housekeeping circuit for monitoring the outputs of power

supplies. It directly senses all the output rails without the need for external dividers

and detects undervoltage and overvoltage. It also provides an additional

undervoltage comparator which may be configured with any arbitrary hysteresis

to sense a divided down representation of the AC bulk voltage. The housekeeping

section provides all the features necessary to allow external caps to set the

common timing features of PC type power supplies. In addition, negative rails may

be disabled without affecting operation of the positive sense section. The 2.5 V

series reference is available and can source up to 5 mA. This IC is available in

16 lead packages. Outputs include a POK (Power OK) and a fault signal.

The AS2333 includes sensing for

±12 V, 5 V, and 3.3V. The AS2350 exchanges

a -5 V sense capability for the 3.3 V input. The AS2316 monitors all supply

voltages, but lacks CBD (Crow-Bar Driver).

AS23xx

Secondary Side Housekeeping Circuit

Features

UV Detection on 4 rails

UV Detection of AC/Bulk supply

OV Detection on 4 rails

Open collector PG out

OV

OV plus UV

OV plus UV after startup delay

Ordering Information

Package

Temperature Range

Order Code

16-Pin Plastic SOIC

0 to 105

° C

AS2316D

16-Pin Plastic SOIC

0 to 105

° C

AS2333D

16-Pin Plastic SOIC

0 to 105

° C

AS2350D

16-Pin Plastic DIP

0 to 105

° C

AS2316N

16-Pin Plastic DIP

0 to 105

° C

AS2333N

16-Pin Plastic DIP

0 to 105

° C

AS2350N

91

AS2316 SOIC

14

1

V

CC

FAULT

13

2

+12V

V

REF

12

3

+5V

UVB

11

4

+3.3V

DELAY

10

5

-5V

POK

9

6

-12V

PGCAP

8

7

GND

AC

16

15

HYST

OFF

14

1

V

CC

CBD

13

2

+12V

FAULT

12

3

+5V

V

REF

11

4

+3.3V

UVB

10

5

-12V

DELAY

9

6

GND

POK

8

7

HYST

PGCAP

16

15

OFF

AC

14

1

V

CC

CBD

13

2

+12V

FAULT

12

3

+5V

V

REF

11

4

-5V

UVB

10

5

-12V

DELAY

9

6

GND

POK

8

7

HYST

PGCAP

16

15

OFF

AC

14

1

V

CC

FAULT

13

2

+12V

V

REF

12

3

+5V

UVB

11

4

+3.3V

DELAY

10

5

-5V

POK

9

6

-12V

PGCAP

8

7

GND

AC

16

15

HYST

OFF

14

1

V

CC

CBD

13

2

+12V

FAULT

12

3

+5V

V

REF

11

4

+3.3V

UVB

10

5

-12V

DELAY

9

6

GND

POK

8

7

HYST

PGCAP

16

15

OFF

AC

14

1

V

CC

CBD

13

2

+12V

FAULT

12

3

+5V

V

REF

11

4

-5V

UVB

10

5

-12V

DELAY

9

6

GND

POK

8

7

HYST

PGCAP

16

15

OFF

AC

AS2316 PDIP

AS2333 SOIC

AS2333 PDIP

AS2350 SOIC

AS2350 PDIP