( NOTE: I already posted this question in the motor drivers forum but probably a LED driver would be more suitable for this function).
For controlling the temperature of a cup filled with liquid ethane we have to control the temperature between -160C and -180C. Therefore we will use a temp sensor and a cartridge heater to maintain the temperature of the ethane around -160C. The heater is a small cartridge type (resistance wire in a small 1/8"tube) and will work at +24V/30W max.Probably we will use this heater: https://www.therm-x.com/watlow-firerod-cartridge-heater-c1a-9602.html We want to control the heater by current control. So we are looking for a controller (preferably with SPI interface because we want this to control by a PC with USB to serial bridge can be configured as SPI or I2C or RS485) and we already found a temp sensor interface chip with SPI) that can handle this. Maybe you have a suggestion for a suitable controller? Maybe a LED driver with SPI interface? Other interface (e.g. I2C)is possible but SPI would be more convenient for us).
And something else but related to powe managemant: Maybe you have a suggestion for a low cost relay driver (probably around +24V/300mA)
Best regards
Chris van der Aar
NTS-Group
Eindhoven , The Netherlands
