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UCD7138 Low Side Gate Driver with Body Diode Conduction Sensing

 2015-11-04

【產品特性】

•Customers can use UCD7138 in conjunction with the UCD3138A to intelligently minimize dead time while maintaining system reliability. Body Diode Conduction Time Sensising is superior to Rdson sensing techniques due to better accuracy, no minimum on times and no parasitic concerns
•Strong rail to rail peak current drive capability allows more efficient MOSFET drive in high current applications with multiple paralleled FETs; Strong Drive keeps MOSFET turned off and prevents unintentional miller dV/dt Turn On
•UCD7138 allows the UCD3138A to intelligently monitor and control Synchronous Rectifier Timings. For example the UCD3138A can will be able to detect and compensate for Negative Current through the synchronous rectifiers which would otherwise damage the system
•Short propagation delay with minimized tolerances and variantion allows efficient operation at extremely high frequencies (up to 2MHz)
•Simple, 6 pin device with small footprint minimizes parasitic inductances, reduces rise/fall time, and limits ringing. Allows for close placement next to the Synchronous Rectifier

【產品應用】

•Power Supply: AC/DC, Isolated, no PFC, < 90W
•Switching Power Equipment
•LLC Resonant Converters
•Digital Power Control

【文字介紹】

The UCD7138 device is a 4-A and 6-A single channel MOSFET Driver with body-diode conduction sensing and reporting and is a high performance driver that allows the TI UCD3138A digital PWM Controller to achieve advanced synchronous rectification (SR) control. The device contains a high speed gate driver, a body-diode conduction sensing circuit, and a turn on delay optimization circuit. The device is suitable for high power, high efficiency isolated converter applications where SR dead-time optimization is desired.

The UCD7138 is a 4A/6A Synchronous Rectifier Driver that is designed to work specifically in conjunction with the UCD3138A. The benefits of the chipset include maximizingsystem efficiency by minimizing body-diode conduction time, robust and fast negative current protection and a simple interface.