HR1000A Resonant Half-Bridge Controller SO-16

HR1000A Resonant Half-Bridge Controller SO-16

The HR1000A is a controller designed specifically for the resonant half-bridge topology.

Key Specifications

Features

• 50% Duty Cycle, Variable Frequency Control For Resonant Half-Bridge Converter
• 600V High-Side Gate Driver with Integrated Bootstrap Diode and High dV/dt Immunity
• 1.5A/2A Source/Sink Capability for Both High-Side and Low-Side Gate Drivers
• High-Accuracy Oscillator
• Operates at up to 600kHz
• Two-Level Over-Current Protection: Frequency-Shift and Latched Shutdown with Programmable Duration Time
• Remote ON/OFF Control and Brown-Out Protection through the BO Pin
• Latched-Disable Input for Easy Protections Implementation
• Interfaces with PFC Controller
• Programmable Burst-Mode Operation at Light-Load

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