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Ucc28019

Other Parts Discussed in Thread: UCC28019
 我使用UCC28019芯片,6脚分压后5v,7脚供电12v,就是4脚,我分压后差不多在3V,但是一接在芯片,电压被拉到零了,是怎么回事?求解,电路图手画,可能有点儿丑,麻烦指点一下  谢谢