HS8108B中文資料華芯數(shù)據(jù)手冊PDF規(guī)格書

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