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TPS40057带载问题请教

Other Parts Discussed in Thread: TPS40057
 TPS40057 2种参数
12V输入  输出5.5V 3A
12V输入  输出3.3V 5A
做的首板带载正常
小批量试产时  5.5V 只能带1A  3.3V 只能带2A
12V的电解加大点  有些带载可以 有些还是不行
可以帮忙看下吗