目前正在尝试设计一款输入为5~24V,输出可以在恒流、恒功、恒压模式切换的小功率电源。方式是采用MCU对TPS62175的输出电压、输出电流进行采用,然后通过DAC反馈至TPS62175的FB引脚。电路图如下:
目前是调试过程中有以下问题:
在恒压模式(计划稳在3V)下,输出电压会突然升高,原因不明。MCU反馈频率>10KHz。波形如下(黄线为输出电压,蓝线为FB反馈电压):
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