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TPS92641PWP异常请教???

我的设计是参考 这个设计的www.ti.com.cn/.../pmp8016,输入是12V 10A,输出:2.6V to 4.9V   0-20A,使用PWM调光,PWM 为5KhZ,打板回来,经测试,当电流增加到一定值时HG输出变低,或者当负载变小时也是如此,并且异常时电感有声音。