I am putting together a small board to drive some N channel MOSFETs to control a 24V DC load from an ESP8266 running Tasmota for a home automation project. I will use these boards to control 24V gardening solenoids and also to PWM dim 24V DC LED lights.
I was thinking about isolating the load power supply from the micro controller power supply via an optoisolator and found the Vishay VOM1271 Photovoltaic MOSFET Driver. When I compare the VOM1271 with the LM5111 that I have used previously I notice the rise and fall time of the VOM1271 to be orders of magnitude slower than the non-isolated LM5111 gate driver
Datasheets:
https://www.vishay.com/docs/83469/vom1271.pdf
https://docs.rs-online.com/1906/A700000006905993.pdf
I have put together an initial design (incomplete, no de-coupling etc, will need an I2C hardware PWM driver to get the PWN freq I want) and would welcome some suggestions on the MOSFET gate driver and whether it would better to use the LM5111 with a separate open collector type optoisolator between the ESP8266 and LM5111. I am not quite sure on calculating the propagation delays.
I was thinking about isolating the load power supply from the micro controller power supply via an optoisolator and found the Vishay VOM1271 Photovoltaic MOSFET Driver. When I compare the VOM1271 with the LM5111 that I have used previously I notice the rise and fall time of the VOM1271 to be orders of magnitude slower than the non-isolated LM5111 gate driver
Datasheets:
https://www.vishay.com/docs/83469/vom1271.pdf
https://docs.rs-online.com/1906/A700000006905993.pdf
I have put together an initial design (incomplete, no de-coupling etc, will need an I2C hardware PWM driver to get the PWN freq I want) and would welcome some suggestions on the MOSFET gate driver and whether it would better to use the LM5111 with a separate open collector type optoisolator between the ESP8266 and LM5111. I am not quite sure on calculating the propagation delays.