zhengchao201105
Member level 2
- Joined
- Jul 11, 2012
- Messages
- 49
- Helped
- 2
- Reputation
- 4
- Reaction score
- 2
- Trophy points
- 1,288
- Activity points
- 1,621
hello everyone
this is a very simple design even I can not understand the influence of 9.1v zener,
you can find the simulation result,if D1 is de-populated,mosfet M4 source point and M1 drain point shoud be similar and equal to (15v-(-15v))÷(392+220)*392=4.22v.
the result is totally different if the zener is populated.can you help me to explain the reason?
The datasheet:
https://www.vishay.com/docs/91080/91080.pdf