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用TPS40210做的一个升压电路,输出电压不能正确调整

Other Parts Discussed in Thread: TPS40210

用TPS40210做了一个升压电路,目标电压是120左右,负载电流只需要1mA。反馈电阻R1/R2 = 510k/3k,根据计算应该输出119V,但是实际输出只有86V。调整R1到560k,也只有几V的电压提升,达不到预期的120V+

ps:输入5V,使用150uH电感,开关频率500k。观察开关信号并没有达到占空比饱和。