[原创] Linear LTC7820大功率无电感电荷泵控制方案

Linear公司的LTC7820是固定比例高压大电流开关电容/电荷泵控制器,包括了四个N沟MOSFET栅极驱动器,用来驱动电压分压器,倍增器和反相器的外接功率MOSFET.器件降压比例2:1,输入电压高达72V;升压比例会1:2,输入电压高达36V或反相器比例1:1,输入电压高达36V.工作频率100kHz 到1MHz,主要用在总线转换器,大功率分布式电源系统,通信系统和工业应用.本文介绍了LTC7820主要特性,框图,多种应用电路以及演示板2543A主要特性和指标,电路图,材料清单和PCB设计图.

The LTCR7820 is a fixed ratio high voltage high powerswitched capacitor/charge pump controller. The deviceincludes four N-channel MOSFET gate drivers to driveexternal power MOSFETs in voltage divider, doubler orinverter configurations. The device achieves a 2:1 stepdownratio from an input voltage as high as 72V, a 1:2step-up ratio from an input voltage as high as 36V, or a1:1 inverting ratio from an input voltage up to 36V. Eachpower MOSFET is switched with 50% duty cycle at aconstant pre-programmed switching frequency. Systemefficiency can be optimized to over 99%. The LTC7820provides a small and cost effective solution for highpower, non-isolated intermediate bus applications withfault protection.

The LTC7820 switching frequency can be linearlyprogrammed from 100 kHz to 1MHz. The device is availablein a thermally enhanced 28-lead QFN package with someno-connect pins for high voltage compatible pin spacing.

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