I want to use PTC components of size 0805 as mini-heaters in an environment which has a temperature changing from 25 to 90Â°C.
I want to keep the PTC temperature as stable as possible, goal is a maximum deviation of 3Â°C.
If I use the standard way to connect the PTC (Directly on 5V) I still get a PTC teperature difference of about 20Â°C when varying the environment on the given range.
Is there a way to get better results ? I was thinking of switching the PTC OFF when >500ohm and ON when <500ohm but before building a schematic to achieve this I would like your opinion.
Some remarks :
- Application : Keeping a sensor on temperature using a PTC with minimum board dimensions in an temperature-changing environment
- Because of board dimensions I dont want a seperate heater/sensor
- Yep, I tested and the 0805 size gives enough power