其余功能,限流,调整电压,都可以实现,但芯片随充电电流越大发热越严重,已经烧坏了好几片了。上下MOS管栅极波形也看了,是正常的。但芯片空载时vcc输入电流达到25mA,充电电流0.7A时VCC上有50mA的电流,随之快速升温直至烧坏或保护。原理图检查没有什么问题,器件也检查过了。有人遇到过这种情况吗?
如能指教,不胜感激
原理图及PCB见附件
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