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TPS40210带负载的问题

Other Parts Discussed in Thread: BQ24620

上图是电路图,器件参数与原理图一致,后面的负载是贵公司的BQ24620,目的是给锂电池充电,当不接后面的充电电路时,可以升压到29.2v,接后面的充电电路后,输出电压vout从20v(未经升压的输入电压)到29.2v(想得到的输出电压)来回跳动,请问这是怎么回事,和前后级电路功率有关吗