设计思路是
- LM2776输入电压为USB的+5V
- 然后经过LM2776反向生成-5V
- -5V电压接入TPS72325输出-2.5V
但是测试后 LM2776输出为-0.7V TPS72325输出为0.6V 导致运放无法工作
原理图如下
AGND和GND单点接地
TPS72325通过可控电源输入-5v 电流为4mA
PCB:
想请问这样设计有问题嘛,如果需要改动有什么新的方案适合
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