HFC0100 Quasi-Resonant Controller SOIC

HFC0100 Quasi-Resonant Controller SOIC

The HFC0100 is a peak current mode controller with green mode operation.

Key Specifications

Features

• Universal Main Input Voltage (85VAC to 265VAC)
• Quasi-Resonant Operation
• Valley Switching for High Efficiency and EMI Minimization
• Active Burst Mode for Low Standby Power Consumption
• Internal High-Voltage Current Source
• High Level of Integration Decreases Required External Component Count
• Maximum Frequency Limit
• Internal Soft Start
• Internal 250nS Leading-Edge Blanking
• Thermal Shutdown (Auto-Restart with Hysteresis)

Typical Application Circuit

Applications

• Battery Chargers for Cell Phones, Digital Cameras, Video Cameras, Electric Shavers, Emergency Lighting Systems, etc.
• Standby Power Supplies for CRT TVs, Projection TVs, LCD TVs, PDP TVs, Desktop PCs, Audio Systems, etc.

Design Notes

• The PFC inductor must support the maximum duty cycle at the lowest line voltage, which is where saturation risk peaks.
• High-voltage startup and X-capacitor discharge paths dominate no-load standby loss; verify them against the efficiency target.
• Leakage inductance and the RCD clamp set the turn-off loss — snubber values are a thermal trade-off, not a fixed recipe.
• Synchronous rectification timing must track the primary switching; a mistimed SR FET conducts through its body diode and fails hot.

Common Questions