Hello, I am trying to understand how mosfets work and I created this theoretical configuration.
Lets say I have a load with 2 n-type mosfets, one between vcc (18V) and the load and the other between the load and gnd (0V). Can I use a 5V microcontroller to keep the bottom mosfet (between load and gnd) ON and use a blinking pattern on the top mosfet (between vcc and load) to turn the load on and off?
Driving the low-side mosfet is straight forward as long as the gate-source voltage of the particular mosfet is 5V or similar (please correct if I am wrong).
What about the high-side? When the low side is switched on then the source voltage of the high-side is 0V (pulled low) so the top mosfet should need 5V at the gate? Something doesn't seem right but I can't figure it out.
I appreciate any advice you can give. Thanks.
![Notes_240430_190631.jpg Notes_240430_190631.jpg](https://forum.allaboutcircuits.com/data/attachments/308/308911-ac54ee28491464d62626806b60993eb4.jpg)
![Notes_240430_190631.jpg Notes_240430_190631.jpg](https://forum.allaboutcircuits.com/data/attachments/308/308911-ac54ee28491464d62626806b60993eb4.jpg)
MCH170
Lets say I have a load with 2 n-type mosfets, one between vcc (18V) and the load and the other between the load and gnd (0V). Can I use a 5V microcontroller to keep the bottom mosfet (between load and gnd) ON and use a blinking pattern on the top mosfet (between vcc and load) to turn the load on and off?
Driving the low-side mosfet is straight forward as long as the gate-source voltage of the particular mosfet is 5V or similar (please correct if I am wrong).
What about the high-side? When the low side is switched on then the source voltage of the high-side is 0V (pulled low) so the top mosfet should need 5V at the gate? Something doesn't seem right but I can't figure it out.
I appreciate any advice you can give. Thanks.
![Notes_240430_190631.jpg Notes_240430_190631.jpg](https://forum.allaboutcircuits.com/data/attachments/308/308911-ac54ee28491464d62626806b60993eb4.jpg)
![Notes_240430_190631.jpg Notes_240430_190631.jpg](https://forum.allaboutcircuits.com/data/attachments/308/308911-ac54ee28491464d62626806b60993eb4.jpg)
MCH170