MP6908A

Fast Turn-Off Intelligent Rectifier with No Need for Auxiliary Winding

Datasheet

Description

The MP6908A is a low-drop diode emulator IC that, when combined with an external switch, replaces Schottky diodes in high-efficiency flyback converters. The MP6908A regulates the forward drop of an external synchronous rectifier (SR) MOSFET to about 40mV, which switches off once the voltage becomes negative.

The MP6908A can generate its own supply voltage for battery charging applications with a potential low output voltage. The MP6908A can also generate this voltage at short-circuit output conditions or high-side SR configurations. Programmable ringing detection circuitry prevents the MP6908A from turning on falsely at V_DS oscillations during discontinuous conduction mode (DCM) and quasi-resonant operation.

The MP6908A is available in a space-saving TSOT23-6 package.

Features & Benefits

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
Available in a TSOT23-6 Package