Part Number: DH321
Function: Green Mode Fairchild Power Switch (FPS)
Package: DIP, SO 8 Pin Type
Manufacturer: Fairchild Semiconductor
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Description
The DH321, 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.
Pinouts:
Features
• Internal Avalanche Rugged Sense FET
• Consumes only 0.65W at 240VAC & 0.3W load with Advanced Burst-Mode Operation
• Frequency Modulation for low EMI
• Precision Fixed Operating Frequency
• Internal Start-up Circuit
• Pulse by Pulse Current Limiting
• Abnormal Over Current Protection
• Over Voltage Protection
• Over Load Protection
• Internal Thermal Shutdown Function
• Auto-Restart Mode
• Under Voltage Lockout
• Low Operating Current (max 3mA)
• Adjustable Peak Current Limit
• Built-in Soft Start
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.
Block Diagram
DH321 Datasheet PDF Download
Other data sheets are available within the file: DH-321, DL321, FSDH321, FSDH321L, FSDL321
