- #1
likephysics
- 636
- 2
I have a N-ch Mosfet load switch that connects to a WiFi module on a circuit board.
When the switch is turned OFF, I still see a voltage of 1.4V at the load.
Ckt attached.
I decreased the bleed resistor from 1k to 100 ohms. The off voltage decreased to 1.1v.
This doesn't happen with other loads like cellular modules, only with a particular WiFi module (WPER-172GN).
I don't have other wifi modules at the moment.
The N-Ch Mosfet is DMN1019
The WiFi module is WPER-172GN. The IC is Ralink RT5390. Cannot find Datasheet online!
The cellular module is EM820W and others. None of them gave me problems.
I can't figure out what kind of load would make the circuit behave like this.
When the switch is turned OFF, I still see a voltage of 1.4V at the load.
Ckt attached.
I decreased the bleed resistor from 1k to 100 ohms. The off voltage decreased to 1.1v.
This doesn't happen with other loads like cellular modules, only with a particular WiFi module (WPER-172GN).
I don't have other wifi modules at the moment.
The N-Ch Mosfet is DMN1019
The WiFi module is WPER-172GN. The IC is Ralink RT5390. Cannot find Datasheet online!
The cellular module is EM820W and others. None of them gave me problems.
I can't figure out what kind of load would make the circuit behave like this.