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UCC256403: LLC半桥无上管驱动

Part Number: UCC256403

我在使用UCC256403驱动半桥时,VCR上能检测到三角波,但此时上管一直没有驱动信号,下管有最多1us脉宽的驱动信号,此时BLK上是3.7V,LL/SS上是1.45V,为什么上管上没有驱动,或是缓启动过程没有启动