Hi, Everyone.
I designed TPS7A8300 linear regurator power.
I used Anyouy device many time, so I am familiar with Anyout mode. It is work well.
I wanted to use only one kind of LDO and I need 4.5V, I designed external resistor mode.
But it is not work.
I think 10K / 46.3K network will make 4.5V but output is about 1.4V
I changed 20K /91K that similar to the datasheet example, but output is about 1.2V
So.. I test many resistor network set.
2K / 9.1K output is about 2.3V
1K / 4.7K output is aobut 3.6V
200 / 910 output is about 4.0V
100 / 470 output is about 4.3V....
As described in the datasheet, the output should be very little difference, but the result is very different.
Having worried about my mistake, I did swap two resistor 20K / 91K --> 91K / 20K
But this output is about 0.806V.
FB pin (pin number 3) is measured always 0.8V
I want to know what I am doing wrong.
