Analog PWM Cooling Fan Controller Circuit Design
A purely analog and discrete-logic design that maps a 0 to 5 V temperature input to a 12 V, four-wire PWM fan output.
- Organization
- Design challenge
- Area
- Engineering
- Status
- Design complete
What I did
- Designed a temperature-controlled PWM fan circuit using only analog and discrete logic.
- Specified complete fan shutdown below a 2.5 V threshold.
- Designed continuous duty-cycle adjustment from 50% at 2.5 V to 100% at 5.0 V.
- Used an LTC6992-1 PWM generator operating at about 25 kHz.
- Physical hardware validation has not been established.