HR1002 Enhanced LLC Controller SOIC

HR1002 Enhanced LLC Controller SOIC

The HR1002 is an enhanced LLC controller that provides robust adaptive dead-time adjustment (ADTA) and capacitive mode protection (CMP), as well as improved functional surge performance.

Key Specifications

Features

• Over-Current Protection (OCP) with Configurable Delay for Enhanced Surge Performance
• Adaptive Dead-Time Adjustment (ADTA)
• Capacitive Mode Protection (CMP)
• 50% Duty Cycle, Variable Frequency Control for Resonant Half-Bridge Converter
• 600V High-Side Gate Driver with Integrated Bootstrap Diode, High-Accuracy Oscillator, and High dV/dt Immunity
• Operates Up to 600kHz
• Two-Level Over-Current Protection (OCP): Frequency Shift and Latched Shutdown with Configurable Duration
• Latched Disable Input for Easy Protection
• Remote On/Off Control and Brownout Protection through BO
• Configurable Burst Mode Operation under Light-Load Conditions

Typical Application Circuit

Applications

• LCD and PDP TVs
• Desktop PCs and Servers
• Telecom SMPSs
• AC/DC Adapters, Open-Frame SMPS
• Power Tools
• Video Game Consoles

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