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不用工频变压器,用开关电源电路加线性调压芯片实现从0V调节,这样的电源能否能实现
开关电源的FB脚通过一个电阻接到外部TRIM脚,再将TRIM脚接到LDO的输出,通过调整TRIM脚的电压,理论上可以实现开关电源输出电压从0V的调节。