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LM2576HV烧毁(48v转12v供电)

Other Parts Discussed in Thread: UCC20520, LM2576HV

我在制作隔离的同步buck电路, mos驱动使用的是ucc20520, 隔离电源使用村田的隔离电源模块.

现在发现上电之后不给pwm信号,一切12v供电正常,但是只要加入PWM信号之后48v转12v的LM2576HV电源芯片就会烧毁.

电路如下:

同步降压的电路如下: