HS8108 PDF – Power Supply Switching Mode Controller IC

A power supply switching mode controller IC, also known as a power supply controller or SMPS controller, is an integrated circuit designed to control and regulate the operation of a switching mode power supply (SMPS). These ICs are widely used in various power supply applications to achieve efficient power conversion.

Part Number: HS8108

Function: Power Supply Switching Mode Controller IC

Package: DIP 20 Pin Type

Manufacturer: HuaXin

Images:HS8108 pdf


The 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.


  1. Pulse Width Modulation (PWM) Control: These chips generate a PWM signal that controls the switching of the power supply’s primary-side switches, such as MOSFETs or IGBTs. The duty cycle of the PWM signal determines the on-time and off-time of the switches, regulating the output voltage or current.
  2. Voltage Feedback Control: Off-line power supply control chips incorporate feedback control loops to regulate the output voltage. They compare the output voltage with a reference voltage and adjust the PWM signal accordingly to maintain a stable and desired output voltage.
  3. Power Factor Correction (PFC): Many off-line power supply control chips include power factor correction functionality. PFC helps improve the power supply’s input power factor, reducing harmonic distortion and maximizing power efficiency.
  4. Protection Features: These chips provide protection mechanisms to safeguard the power supply and connected components. Common protection features include overvoltage protection, undervoltage lockout, overcurrent protection, overtemperature protection, and short circuit protection.


HS8108 pinout datasheet


1. PC half-bridge (or 494) power supply supervisor + two 431 + PWM

2. Remote ON/OFF function

3. Power-down warning circuitry ﹠ Power good circuitry

4. Delay time for PSON and PG signal

5. Over-voltage protection for 3.3V, 5V and 12V

6. Under-voltage protection for 3.3V, 5V,12V, -12V and/or -5V

7. Push-pull PWM operation and totem pole outputs

8. Over-power and short-circuit protection

9. Two shunt regulator for 3.3V and 5V Sb

HS8108 PDF Datasheet