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关于MAXM17635打嗝模式的疑问

问题描述:

MAXM17635的datasheet指出,当电流超过IRUNAWAY-LIMIT或反馈电压低于正常值的64%时会进入到打嗝模式,但是当电流超过IPEAK-LIMIT时高边开关会关断,不会再有电流流过,电流不会继续增加,而IRUNAWAY-LIMIT是大于 IPEAK-LIMIT,也就是说电流是无法达到 IRUNAWAY-LIMIT的,那么请问MAXM17635如何才能进入到打嗝模式?

=========================================================================

答案:

MAXM17635会在电流超过IPEAK-LIMIT时关断高边开关,但这并不是指高边开关会一直关断,它会在下一个周期打开,如果电流仍然超过IPEAK-LIMIT,它仍然会关断并在下一周期打开;如果电流增大并且超过IRUNAWAY-LIMIT,MAXM17635就会进入到打嗝模式。
下图为电流超过IPEAK-LIMIT时LX的波形,

Tags: KA-08613 MAXM17635AMG+ MAXM17635AMG+,hiccup mode
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