Lord_grezington
- May 3, 2013
- 124
- Joined
- May 3, 2013
- Messages
- 124
Hello
I have this circuit built into a PCB, and its a little strange. The fact is it works some times and not others and I am unsure of why...
Power_Button+ & Power_Button- to go a simple low power switch that is designed to switch the power to the rest of the circuit. And it does work (sometimes). The mosfet is a CSD19503KCS with a Vth of 2.8V. When I take a scope to the gate pin it says 0V even when I flick the switch on or off. But, the power is still on current is flowing through the circuit @ 0V on gate!! I did not think there were any min values for the drain/source voltage but maybe I am wrong... It has currently decided not to work so I cant get the voltages when its working OK.
D2 is a 45V TVS
Thanks
![upload_2017-9-27_14-38-58.png upload_2017-9-27_14-38-58.png](https://maker.pro/forums/data/attachments/34/34886-339130b00c819fbf839c70a6c1acc7aa.jpg)
I have this circuit built into a PCB, and its a little strange. The fact is it works some times and not others and I am unsure of why...
Power_Button+ & Power_Button- to go a simple low power switch that is designed to switch the power to the rest of the circuit. And it does work (sometimes). The mosfet is a CSD19503KCS with a Vth of 2.8V. When I take a scope to the gate pin it says 0V even when I flick the switch on or off. But, the power is still on current is flowing through the circuit @ 0V on gate!! I did not think there were any min values for the drain/source voltage but maybe I am wrong... It has currently decided not to work so I cant get the voltages when its working OK.
D2 is a 45V TVS
Thanks
![upload_2017-9-27_14-38-58.png upload_2017-9-27_14-38-58.png](https://maker.pro/forums/data/attachments/34/34886-339130b00c819fbf839c70a6c1acc7aa.jpg)