Part Number : DH321 ( Marking Code ) 

Function : Green Mode Fairchild Power Switch (FPS)

Package : DIP 8, SOP 8 Pin Type

Maker : Fairchild Semiconductor

Pinouts :
DH321 datasheet

Description :

The FSDx321(x stands for H, L) are integrated Pulse Width Modulators (PWM) and Sense FETs specifically designed for high performance offline Switch Mode Power Supplies (SMPS) with minimal external components.


Both devices are integrated high voltage power switching regulators which combine an avalanche rugged Sense FET with a current mode PWM control block. The integrated PWM controller features include: a fixed oscillator with frequency modulation for reduced EMI, Under Voltage Lock Out (UVLO) protection, Leading Edge Blanking (LEB), optimized gate turn-on/turn-off driver, Thermal Shut Down (TSD) protection, Abnormal Over Current Protection (AOCP) and temperature compensated precision current sources for loop compensation and fault protection circuitry.


• Internal Avalanche Rugged Sense FET

 Frequency Modulation for EMI Reduction

• Precision Fixed Operating Frequency
• Internal Start-up Circuit
• Pulse-by-Pulse Current Limiting

Others datasheet of same file : DL321, FSDH321, FSDH321L, FSDL321

Datasheet PDF Download :
DH321 pdf

2021/09/17 11:54 2021/09/17 11:54