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UC3843地线的问题

Other Parts Discussed in Thread: UC3843

使用UC3843设计BOOST电路.输入15-21VAc,输出36V 2A.测试时发现芯片的VCC有500Mv左右的波动。输出电流达到一定值时输出的PWM波形就不稳定。测试地线,发现输出电容与输入电容的地有2V的电势差。芯片的地与输入电容也有0.5V的电势差。怀疑是PCB的问题。请各位帮我看看PCB的布线是不是有干扰呢?