APW1681

Features:

• Over Voltage Protection and Lock Out for 3.3 V, 5 V, and 12 V
• Under Voltage Protection and Lock Out for 3.3 V and 5 V
• Fault Protection Output with Open Drain Output Stage
• Open Drain Power Good Output Signal for Power Good Input, 3.3 V and 5 V
• 300 ms Power Good Delay
• 2.36 ms PSON  Control to FPO  Turn-Off Delay
• 38 ms PSON  Control Debounce
• 75 ms Delay for 3.3V and 5V Under Voltage Protection
• 73 s Width Noise Deglitches
• Wide Power Supply Voltage Range from 4 V to 15 V
• Intelligent Under Voltage Protection to Pre vent Instantaneously AC Power Black Out


Application

• PC Switching Power Supply


Pinout




Specifications

Symbol	Parameter	Rating	Unit
VCC	Supply Voltage	16	V
VS5, VS33	5V and 3.3V Input Voltage(Note 1)	8	V
FPO	Fault Protection Output Voltage	16	V
PSON	ON/OFF Control Input Voltage(Note 1)	8	V
PGI	Power Good Input Voltage(Note 1)	8	V
PGO	Power Good Output Voltage(Note 1)	8	V
TA	Ambient Temperature Range	0 to 70	°C
TSTG	Storage Temperature Range	-65 to +150	°C
TL	Lead Temperature (Soldering, 10 second)	260	°C

Description

The APW1681 is designed to minimize the external components of personal-computer switching power supply systems. It provides protection circuits, power good indicator, fault protection output FPO    and PSON  control. OVP (over voltage protection) monitors 3.3V, 5 V, and 12 V (12 V OV detects via V _CC terminal). UVP (under voltage protection) monitors 3.3V and 5V.
When an OV or UV condition is detected, the PGO (power good output) is set to low and FPO  is latched to high. PSON  from low to high resets the protection latch. There is a 2.36ms turn-off delay fromPSON   to FPO  . There is no delay during turn on.
Power good feature monitors PGI, 3.3V and 5V under voltages, and issues a power good signal when they are ready.