[原创] Linear LTC3897PolyPhase同步升压转换器解决方案

Linear公司的LTC3897是带输入/输出保护的PolyPhase™同步升压转换器,能驱动两个N沟功率MOSFET级,输入电压4.5V-65V(高达75V浪涌),输出高达65V,主要用在工业,汽车和军事/航空航天.本文介绍了LTC3897主要特性,框图和十多种应用电路,以及演示板DC2108主要特性,电路图和材料清单.

The LTC.3897 is a synchronous boost DC/DC controller with surge stopper and ideal diode controller. The boost controller drives two N-channel power MOSFET stages out-of-phase to reduce input and output capacitor requirements, allowing the use of smaller inductors than the single-phase equivalent. Synchronous rectification reduces power loss and eases thermal requirements.

The surge stopper controls the gate of an external N-channel MOSFET to protect against high voltage input transients and provides in-rush current control, overcurrent protection and output disconnect for the boost converter. The integrated ideal diode controller drives another N-channel MOSFET to replace a Schottky diode for reverse input protection and
voltage holdup or peak detection. It controls the forward voltage drop across the MOSFET and minimizes reverse current flow.
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