AS2333F Datasheet PDF - Astec

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AS2333F
Astec

Part Number AS2333F
Description Secondary Side Housekeeping Chips
Page 7 Pages


AS2333F datasheet pdf
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AS2316F
AS2333F
Secondary Side Housekeeping
Chips
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. This IC is available in 16 lead packages. Outputs
include a POK (Power OK) and a fault signal.
The AS2316F includes sensing for +/- 12 V, +/- 5 V, and 3.3 V. The
AS2333F exchanges a Crow-Bar Driver output for the -5 V input.
PINOUT
VCC FAULT
+12V
+5V
+3.3V
VREF
UVB
DELAY
-5V
-12V
POK
PGCAP
GND
AC
HYST
OFF
AS2316F
AS2316F
16L PDIP
16L SOIC
ORDERING INFORMATION
Product
AS2316F
AS2316F
AS2333F
AS2333F
Temperature Range
0 to 105 °C
0 to 105 °C
0 to 105 °C
0 to 105 °C
VCC
CBD
+12V FAULT
+5V VREF
+3.3V
UVB
-12V DELAY
GND
POK
HYST PGCAP
OFF
AC
AS2333F
AS2333F
16L PDIP
16L SOIC
Package
16-Pin Plastic SOIC
16-Pin Plastic DIP
16-Pin Plastic SOIC
16-Pin Plastic DIP
Part No.
AS2316-16*D-F-000
AS2316-16*N-F-000
AS2333-16*D-F-000
AS2333-16*N-F-000



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BLOCK DIAGRAM
2
+12V
Vref
UV
nUV
VCC VCC
GND
nRESET
nOV
OV t nOVLatch
R
Latch
SQ
5 µs delay
nUVLatch
UV
+5V
AS23xxF
VCC
R
Latch
QS
FAULT
+3.3V
-5V
-12V
AC
HYST
OFF
OV
UV
nOV
OV
OV
nUV
UV
nFAULT
CBD Latch powers up
in RESET state
SQ
Latch
R
nRESET
VCC
CBD
500
nUVLatch
VCC
1µA
Vref
VCC
UVB
VREF
Disable
nOV
OV
UV
t
5 µs delay
nUV
VREF
Vref
Disable
nAC WARNING
VCC
nRESET
nOFF WARNING
HYST
nPOK
VCC
1µA
PGCAP
VCC
POK
Vref
nFAULT
VCC
Vref
1µA
DELAY
VREF
2.5V
chip bias
VREF



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PIN FUNCTION DESCRIPTION
3
AS23xxF
Pin Number
Function
AS2316 AS2333
Description
1
1
VCC
Power input to the chip.
2 2 +12V Input for overvoltage and undervoltage for the +12V rail.
3 3 +5V Input for overvoltage and undervoltage for the +5V rail.
4 4 + 3.3V Input for overvoltage and undervoltage for the +3.3V rail.
5 -5V Input for overvoltage and undervoltage for the -5V rail .
6
5
-12V
Input for overvoltage and undervoltage for the -12V rail.
This function may disabled by tying this pin to a positive
voltage above 2.4V.
7
6
GND
Signal ground and silicon substrate
8 7 HYST Open collector output of the AC undervoltage
comparator. A resistor between this pin and AC will
provide hysteresis to the AC undervoltage sensing.
9
8
OFF
Pulling this pin low will reset the FAULT latch and
discharge the start-up timing capacitors, UVB and PG
CAP, allowing normal start-up of the system. Pulling this
pin high will send the FAULT signal high, prompting a
system shutdown.
10 9
AC Non-inverting input to the AC undervoltage sensing
comparator. If the AC pin is less than 2.5V, POK goes low
and UVB cap discharges.
11 10 PG CAP A cap to ground provides a delay between undervoltage
sensing becoming good and the POK output going high.
Cap discharges whenever an output or AC undervoltage
is detected.
12 11
POK
Open collector output of the undervoltage sensing
comparators. This pin goes low upon an undervoltage
condition. Except for the delay set by the PG CAP, this
pin always reflects the actual state of the undervoltage
sensing.
13 12 DELAY A cap to ground will delay the FAULT signal when the
OFF pin is used to shut down the system. The POK will
signal a power fail warning immediately, but the FAULT
shutdown of the power supply will be delayed.
14 13
UVB
A cap to ground provides start-up blanking of the
undervoltage sensing portion of the FAULT signal. This
pin may also be grounded to prevent undervoltage
conditions from triggering the Fault signal. This pin
discharges the cap whenever AC goes low or the FAULT
pin goes high.
15 14 VREF 2.5 V Voltage reference. This is a series regulator type
reference.
16 15 FAULT Open collector output of the overvoltage and
undervoltage comparators.
16
CBD
Crow bar drive output of the overvoltage faults only.



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ABSOLUTE MAXIMUM RATINGS
Parameter
Supply Voltage
Continuous Power
Junction Temperature
Storage Temperature
Lead Temperature (soldering, 10 seconds)
4
Symbol
VCC
PD
TJ
TSTG
TL
AS23xxF
Rating
20
1000
150
-60 to 150
300
Unit
V
mW
°C
°C
°C
ELECTRICAL CHARACTERISTICS
Electrical characteristics are guaranteed over the full junction temperature range (0-105 °C). Ambient
temperature must be derated based upon power dissipation and package thermal characteristics.
Unless otherwise specified, the conditions of test are VCC = 12V; +3.3V= 3.3V; +5V = 5V; +12V =
12V; -12V = -12V; OFF= low
Parameter Symbol Test Condition
Min Typ Max Unit
BIAS (VCC)
Supply current
ICC
Min Vcc for operation Vcc Min
no faults
Vref= 2.5V, no faults
8 12 mA
4.2 V
VOLTAGE REFERENCE
Output Voltage
Line Regulation
Load Regulation
Temperature
Deviation*
VREF
VREF
VREF
VREF
IREF= 0 mA Tj= 25° C
Vcc= 5V to 15 V
IREF= 0 to -5mA
0< Tj < 105 °C
2.488 2.500 2.525 V
10 15 mV
10 15 mV
10 15 mV
*Temperature deviation is defined as the maximum deviation of the reference over the given
temperature range and does not imply an incremental deviation at any given temperature.
UNDERVOLTAGE, OVERVOLTAGE
+3.3V
+3.3V Undervoltage
+3.3V Overvoltage
UV
OV
2.87 2.95 3.03
3.76 3.86 3.96
V
V
+3.3V Input Current
IB V+3.3 = 3.30 V, V+5 = 5.00 V -0.1 0 0.1 mA
+5V
+5V Undervoltage
+5V Overvoltage
+5V Input Current
UV 4.40 4.50 4.60 V
OV 5.74 5.89 6.04 V
IB V+5= 5.00 V, V+3.3 = 3.30 V
1.6 2.5 mA



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