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Ecomode就是通过在轻载下面通过降低开关的频率来降低开关损耗,从而提高轻载效率。
对于TPS54231来说,芯片通过判断电感上的峰值电流,当其小于100mA时,认为负载为轻载,从而进入Eco-mode,将COMP钳位,阻止上管开通,达到跳周期的效果。
重载条件下,是可以实现,轻载条件下最好还是实验验证一下
如果出现输出周期性跌落的情况,可以参考http://www.ti.com/lit/an/slva547a/slva547a.pdf