One channel isolated MOSFET driver

Design by: 11416

Simple one channel low-side MOSFET driver with optocoupler. BOM: R1 - 1k - SMD0805; R2 - depends on VCC - SMD0805; R3 - 3k3 - SMD0805; U1 - TLP721 or similar - DIP4; Q1 - IRLL014 or similar - SOT223; D1 - schottky diode, voltage depends on VCC and character of load - DO41; D2 - zener diode, voltage depends on max Ugs of Q1 - DO41; Connect control signal (3V3/5V logic) to P1. Connect positive supply of load to VCC, connect low side of load (motor, heater, bulb) to LOAD, connect negative supply of load to GND.