用LM3423设计了调光的电路,Vin=12V,Vout=30V/1A,
(1)当用短路保护功能时,LED驱动IC 3423在测试时发现一个问题,就是在正常输出无PWM调制输出时,短路保护正常;但如果在PWM调制输出时,短路时会烧掉(附件34232.JPG图片中的)R37,R38这2个电阻。PWM调制电路看附件(34231.JPG文件), (2)当不用短路保护(PRD脚悬空)时,电路工作正常。MOS管Q1的D级连到RPD脚,请帮我看看是什么问题。谢谢!
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