© 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 sensed without the necessity of a VEE connection, and negative sensing 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
Pin Configuration — Top view
Features
•
Standard PC Power Good:
UV Detection on 4 rails
UV Detection of AC/Bulk supply
OV Detection on 4 rails
Open collector PG out
•
Pogrammable Fault output:
OV
OV plus UV
OV plus UV after startup delay
•
OV Crow Bar Driver
•
Digital ON/OFF input
•
2.5V Voltage Reference
•
Operates from 5V or 12V rail
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
1V
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
7GND AC
16
15
HYST OFF
14
1V
CC
CBD
13
2+12V FAULT
12
3+5V V
REF
11
4+3.3V UVB
10
5-12V DELAY
9
6GND POK
8
7HYST PGCAP
16
15
OFF AC
14
1V
CC
CBD
13
2+12V FAULT
12
3+5V V
REF
11
4-5V UVB
10
5-12V DELAY
9
6GND POK
8
7HYST PGCAP
16
15
OFF AC
14
1V
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
7GND AC
16
15
HYST OFF
14
1V
CC
CBD
13
2+12V FAULT
12
3+5V V
REF
11
4+3.3V UVB
10
5-12V DELAY
9
6GND POK
8
7HYST PGCAP
16
15
OFF AC
14
1V
CC
CBD
13
2+12V FAULT
12
3+5V V
REF
11
4-5V UVB
10
5-12V DELAY
9
6GND POK
8
7HYST PGCAP
16
15
OFF AC
AS2316 PDIP
AS2333 SOIC
AS2333 PDIP
AS2350 SOIC
AS2350 PDIP