DESCRIPTION：
HS8108 is a power supply switching mode controller IC for desktop PCs.
It provides all the functions necessary to monitor and control the output
of the power supply. Remote ON/OFF control, power good circuitry, some
protection features against over-voltage and over-power are implemented.
It directly senses all the output rails for OVP without the need of external
dividers. A built-in timer generates accurate timing for control circuit
including the PS-off delay. The cycle-by-cycle PWM switching prevents the
power transformer from saturation and ensure the fastest response for the
short-circuit protection which greatly reduce the stress for power
transistors. Two internal precise 431 shunt regulators provide stable
reference voltage and driver for 3.3V and 5V-standby regulation. Utilizing
minimum number of external components, the HS8108 includes all of the
functions for push-pull and/or half-bridge topology, decreasing the
production cost and PCB space,and increasing the MTBF for power supply.

FEATURES：
PC half-bridge (or 494) power supply supervisor + two 431 + PWM
Remote ON/OFF function
Power-down warning circuitry ﹠ Power good circuitry
Delay time for PSON and PG signal
Over-voltage protection for 3.3V, 5V and 12V
Under-voltage protection for 3.3V, 5V,12V, -12V and/or -5V
Push-pull PWM operation and totem pole outputs
Over-power and short-circuit protection
Two shunt regulator for 3.3V and 5V Sb
Soft-start and maximum 93% duty cycle
On-chip oscillator and error amplifier