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TPS40200输入12~15V,输出7.8V,为什么在13.8~14.2V电压输入区间输出会震荡?

Other Parts Discussed in Thread: TPS40200

TPS40200输入12~15V,输出7.8V,带负载时,在13.8~14.2V电压输入区间7.8V的输出产生了震荡。输入小于13V后震荡消失恢复正常工作。上电时输入15V以上也不会有震荡产生。

震荡波形为斜向上三角锯齿波,振荡频率大概17Hz。

负载为射频设备,间隔5~6s发射一次信号,最大电流700mA,最小电流130mA。

空载时,不会有震荡产生。

求助:该如何配置可以使得带负载时电压输入12~15V区间不会有震荡产生?