MP6951 1MHz Fast Turn-Off Rectifier TSOT23

MP6951 1MHz Fast Turn-Off Rectifier TSOT23

The MP6951 is a secondary synchronous rectification driver using flip-chip assembly technology for high-frequency flyback converters.

Key Specifications

Features

• Supports Discontinuous Conduction Mode (DCM), Continuous Conduction Mode (CCM), Quasi-Resonant (QR), Zero Voltage Switching (ZVS), Active Clamp Flyback and Hybrid Flyback (HFB)
• Supports Up to 1MHz Switching Frequency (fSW)
• Wide Output Voltage (VOUT) Range Down to 0V
• No Need for Auxiliary Winding for High-Side or Low-Side Rectification
• VDS Ringing Detection Prevents False Trigger during DCM, QR, and ZVS Operations
• Works with Logic Level MOSFET (GaN and SiC)
• Fast Turn-Off and Turn-On Delay
• <300μA Quiescent Current (IQ)
• Supports High-Side and Low-Side Rectification
• Available in a TSOT23-6 Package

Typical Application Circuit

Applications

• USB PD and Quick Chargers
• Adapters

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