some questions of “Control TEC with ADN8830”

it's the schematic.

there are some questions.

1、the schematic is right?

2、the voltage of VREF(pin7)can't reach 2.5V,only about 1V.【VCC=5V】

3、4 MOSFETs can be turned on only three.

4、the voltage of pin12 Doesn’t equal the  Twenty times the second pin and the fourth pin of the voltage difference +1.5V。


what should I do to solve these problem.

thanks to answer.

For a Chinese, English is really hard to ask questions