1、VSYS接DC8V电源时,芯片发烫,经测量有3.27V电压输出,烧坏后经测量VIN脚与GND短路,焊下烧坏芯片,测量无短路。
2、VSYS接DC12V电源时,上电直接烧坏,多数是VIN脚与GND脚短路,还有SW脚与GND短路的情况。
3、断开负载,上电DC8V和DC12V均能正常工作,电压输出3.25V
4、负载不超过500mA。
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Hi
必须确保电感饱和电流足够(对于一个比较差的牌子的电感,最好实际测试一些饱和电流)