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LM22676: 使用24V输入,转换成15V@500mA输出,仿真结果正常,但将VOUT与GND调换,目标输出-15V,实际只能输出-10.7V,FB电压也到不了1.285V,请高手指点!

Part Number: LM22676
Other Parts Discussed in Thread: LM22678, LM22679, LM22673, LM22670, , LM22677

1、以下是24V转15V时,仿真电路图和波形:正常。

2、以下是24V转-15V时,仿真电路图和波形:异常,只能到-10.7V。