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lm5117电源高低边管



想请教个问题,我是15v输入,5v输出的稳压源,现在的情况是带载(6om)输出为4.45v,然后高边管温度特别高,底边管不发烫,控制波形也不是pwm,下面是原理图

下面是带载高边管ho的波形

下面是低边管lo波形

两个波形上面都会有不连续的尖峰出现,想请教下