The primary-side PWM controller FAN100 significantly simplifies power supply design that requires CV and CC regulation capabilities. The FAN100 controls the output voltage and current precisely with the information in the primary side of the power supply, not only removing the output current sensing loss, but eliminating secondary feedback circuitry.

The green-mode function with a low startup current (10µA) maximizes the light-load efficiency so the power supply can meet stringent standby power regulations.

Compared with a conventional secondary-side regulation approach, the FAN100 can reduce total cost, component count, size, and weight; while simultaneously increasing efficiency, productivity, and system reliability.

FAN100 controller is available in an 8-pin SOP package.

• Constant-Voltage (CV) and Constant-Current (CC) Control without Secondary-Feedback Circuitry
• Accurate Constant Current Achieved by Fairchild’s Proprietary TRUECURRENT™ Technique
• Green Mode: Frequency Reduction at Light Load
• Fixed PWM Frequency at 42kHz with Frequency Hopping to Reduce EMI
• Low Startup Current: 10µA Maximum
• Low Operating Current: 3.5mA
• Peak-Current-Mode Control in CV Mode
• Cycle-by-Cycle Current Limiting
• Over-Temperature Protection with Auto-Restart
• Brownout Protection with Auto-Restart
• V_DD Over-Voltage Protection with Auto-Restart
• V_DD Under-Voltage Lockout (UVLO)
• Gate Output Maximum Voltage Clamped at 18V
• SOP-8 Package

• Battery Chargers for Cellular Phones, Cordless Phones, PDA, Digital Cameras, Power Tools
• Replaces Linear Transformer and RCC SMPS
• Offline High Brightness (HB) LED Drivers