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TL3844用UC2844,2844 10片有6片烧坏输出脚

Other Parts Discussed in Thread: UC2844, TL3844

原设计使用TL3844 但由于工作温度  将TL3844更改为UC2844,样机验证通过。小批量试制时出现大批量频繁启动。波形与测试数据,电流见附件;望大神们指点。

黄色为28446脚悬空输出 0.5V  蓝色为28447脚供电脚10~16V

 

黄色为38446脚悬空输出 VCC  蓝色为38447脚供电脚10~16V

 

黄色为28446脚悬空输出 0.5V 蓝色为384485V输出脚

 

黄色为28446脚悬空输出 0.5V 蓝色为384485V输出脚  资深为28444脚震荡信号、绿色为28442脚输入信号

 

 

6脚对地加1K电阻后没有输出一直为0V

 

电路如图

测试波形.doc