I working on a small project, controlling a FAN(blower type). The Fan operates with a 5V PWM signal or a 0-5V analog signal.
I will be using the EMC2301 - Thermal Management - Closed Fan Controllers (microchip.com), with a Pull-up resistor on the PWM pin to 5V.
The remaining parts PCB runs of 3.3V.
The Voltage prior to the 3.3V step-down DC-DC will be 12-24V.
I would like to avoid using a step-down for 5V, as it's only needed for a PWM signal.
Would using Zener diode with a series resistor be the best option?