General 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.

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 Control to Turn-Off Delay
• 38 ms PSON Control Debounce
• 75 ms Delay for 3.3V and 5V Under Voltage Protection
• 73 µs Width Noise Deglitches
• Wide Power Supply Voltage Range from 4 V to 15 V
• Intelligent Under Voltage Protection to Prevent Instantaneously AC Power Black Out PSON FPO

APPLICATIONs
• PC Switching Power Supply