MP6908A 600kHz Fast Turn-Off Intelligent Rectifier TSOT23

MP6908A 600kHz Fast Turn-Off Intelligent Rectifier TSOT23

The MP6908A is a low-drop diode emulator IC that, when combined with an external switch, replaces Schottky diodes in high-efficiency flyback converters.

Key Specifications

Features

• Supports DCM, CCM, Quasi-Resonant Operations and Active Clamp Flyback
• Supports up to 600kHz Switching Frequency
• Wide Output Range down to 0V, No Short Circuit Current Flows through Body Diode
• No Need for Auxiliary Winding for High-Side or Low-Side Rectification
• Ringing Detection Prevents False Turn-On during DCM and Quasi-Resonant Operations
• Works with Standard and Logic Level SR MOSFETs
• Compatible with Energy Star Standards
• ~30ns Fast Turn-Off and Turn-On Delay
• ~100µA Quiescent Current
• Supports both High-Side and Low-Side Rectification

Typical Application Circuit

Applications

• USB PD Quick Chargers
• Adaptors

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