TI UCD7138 340W数控LLC DC电源参考设计

TI公司的UCD7138是4A和6A单路MOSFET驱动器,集成了体二极管导通检测和报告,和UCD3138A数字PWM控制器一起可进行高挡同步整流(SR)控制.器件包括高速栅极驱动器,体二极管导通检测电路和导通延迟优化电路,非常适合于大功率高效绝缘转换器如LLC转换器,硬开关全桥转换器和数字电源控制应用.本文介绍了UCD7138主要特性,功能框图,半桥LLC应用框图以及340W数控LLC谐振半桥DC/DC电源转换参考设计主要特性和性能指标,电路图,材料清单和PCB元件布局图.
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 Texas Instruments 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 turnon delay optimization circuit. The device is suitable for high-power, high-efficiency isolated converter applications where SR dead-time optimization is desired.
The UCD7138 device offers asymmetrical rail-to-rail 4-A source and 6-A sink peak-current drive capability. The short propagation delay and fast rise and fall time allows efficient operation at high frequencies. An internal high-speed comparator with a –150-mV threshold detects the body-diode conduction and reports the information to the UCD3138A digital-power controller. The UCD7138 device is capable of sensing body-diode conduction time as low as 10 ns. The SR turnon edge is optimized by the UCD7138 device. The SR turnoff edge is optimized by the UCD3138A digital-power controller which analyzes the body-diode conduction information reported by the UCD7138 DTC pin.
The benefits of the chipset include maximizing system efficiency by minimizing body-diode conduction time, robust and fast negative-current protection, and a simple interface.
UCD7138主要特性:
Low-Side Gate Driver With Body-Diode
Conduction Sensing
Gate Turnoff Edge Body-Diode Conduction
Reporting
Gate Turnon Edge Delay Optimization
Works Together W...