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LM 3478升压问题

Micheal Lee
Prodigy 30 points
Other Parts Discussed in Thread: LM3478

你好，设计一个输入15VDC，输出195VDC，20mA的升压电路。按照WEBENCH推荐的原理图和器件，PCB布线基本按照推荐布线规则。上电后MOSFET马上就冒烟了，输出电压也与设计值不符。第一次设计DCDC电路，LM3478是否适合这种应用？这种情况下MOSFET过热一般有哪些原因？谢谢！