HR1204 Digital PFC + LLC Combo Controller TSSOP28

HR1204 Digital PFC + LLC Combo Controller TSSOP28

The HR1204 is a high-performance controller that integrates an advanced, digital, PFC controller and a half-bridge, LLC resonant controller.

Key Specifications

Features

• General System Features
• Meets EuP Lot 6 and CoC Version 5 Tier 2 Specifications
• Standard I2C Interface
• 1k EEPROM to Store Parameters
• User-Friendly GUI for Digital PFC
• VCC Supplied by External DC Input from Additional Isolated Power Source PFC Controller
• High Efficiency from Light Load to Full Load by CCM/DCM Multi-Mode Control
• High PF Due to Patented Input Capacitor Current Compensation
• Programmable Filter for Noise Suppression
• Programmable Frequency Jittering

Typical Application Circuit

Applications

• Notebook Adapters
• All-in-One or Gaming Power Supply
• Desktop PC and ATX Power
• General AC/DC Power Supply up to 600W

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