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TPS40304A如何输出负电压?

Other Parts Discussed in Thread: TPS62150, TPS5430, TPS54160

你好,对于同步PWM控制器如果我想:

Vin=5-15v,Vo=-1v,20A

使用普通的正电压PWM控制芯片如何得到负电源?

吧Vo连到GND,把芯片的GND参考点连到负载的负端?

就这样做一下电势转变就好了吗?还有什么注意的地方?