实际量测结果如下:
1、输入5V8电压:6.12V;
2、输出5V电压:0.584V;
3、U17_13电压:1.313V;
4、U17_3电压:0.145V;
5、为了验证芯片焊接,当我将R103、R104取消掉,输出是0.8V。
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实际量测结果如下:
1、输入5V8电压:6.12V;
2、输出5V电压:0.584V;
3、U17_13电压:1.313V;
4、U17_3电压:0.145V;
5、为了验证芯片焊接,当我将R103、R104取消掉,输出是0.8V。
你的大电容是ceramic的吗?
The TPS7A84 is designed and characterized for operation with ceramic capacitors of 47 μF or greater (22 μF or
greater of capacitance) at the output and 10 μF or greater (5 μF or greater of capacitance) at the input. Using at
least a 47-μF capacitor is highly recommended at the input to minimize input impedance. Place
Hi
电路上看起来没有问题啊,将你的板子的整体图片发上来看一下? 尽量清楚一点。 注意LDO输入电容输出电容尽量靠近芯片的输入输出脚,同时先采用47uF陶瓷电容做测试(用钽电容并联陶瓷电容是可以的,但是先用陶瓷电容做测是,在换成钽电容。如果用钽电容建议用超过1uF的陶瓷电容并联。)
您好
下图是板子的整体图片
下图是关于TPS7A84处,PCBA的照片