HR1001B Enhanced LLC Controller SOIC

HR1001B Enhanced LLC Controller SOIC

The HR1001B is an enhanced LLC controller, which provides new adaptive dead-time adjustment (ADTA) and capacitive mode protection (CMP) features.

Key Specifications

Features

• Adaptive Dead-Time Adjustment
• Capacitive Mode Protection
• 50% Duty Cycle, Variable Frequency Control for Resonant Half-Bridge Converter
• 600V High-Side Gate Driver with Integrated Bootstrap Diode with High dv/dt Immunity High-Accuracy Oscillator
• Operates up to 600kHz
• Two-Level Over-Current Protection: Frequency Shift and Latched Shutdown with Programmable Duration Time
• Latched Disable Input for Easy Protection
• Remote On/Off Control and Brown-Out Protection through the BO Pin
• Programmable Burst Mode Operation at Light Load
• Non-Linear Soft Start for Monotonic Output Voltage Rise

Typical Application Circuit

Applications

• LCD and PDP TVs
• Desktop PCs and Servers
• Telecom SMPS
• AC/DC Adapter, Open-Frame SMPS
• 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