I'm building a battery charger for lead acid batteries, and need to compensate the reference voltage to match the corrected charging voltage vs temperature.
Ideally, I need a nominal 12.00V reference which is reduced by 10mV per degC at temperatures above 25degC, and is increased by 10mV per degree at temperatures below 25degC, over the range from -20 to +40degC.
Ideas? (Extra points if it can be done with Si diode(s) or diode-connected transistor and an LM317, 78L05, or TL431--- trying to avoid yet another Digi-Key Order).
Ideally, I need a nominal 12.00V reference which is reduced by 10mV per degC at temperatures above 25degC, and is increased by 10mV per degree at temperatures below 25degC, over the range from -20 to +40degC.
Ideas? (Extra points if it can be done with Si diode(s) or diode-connected transistor and an LM317, 78L05, or TL431--- trying to avoid yet another Digi-Key Order).