各位大师好,我使用LM22676设计了一个9-36转8V的电路,如图1,未接负载测试中发现以下异常:
①当输入电压低于10V时,电感发出声音, 输出电压存在锯齿状波动如图2,SW引脚测量波形异常如图3,
②当输入电压高于10V时,电感不发出声音,输出电压基本正常如图4,但SW引脚测量波形正弦波震荡如图5。
麻烦大家看下问题出在哪里。
图2
图3
图4
图5
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