|
This is bare minimum logic driven PWM and as close as I can get to no discernable interference camera side. The MOSFET temperature runs below touch detection with a small heatsink - almost imperceptable unless you pinch the heatsink. A small capacitor (100pf - 1nf) could be added gate to source for comfort, but it doesn't really need it. Temp modulates +/-0.5C of setpoint.
A 22uf capacitor gate to source will remove noise to undetectable levels, but the mosfet will overheat, with a change in properties and cooling accuracy.
MOSFET is an NXP PSMN1R1-30PL . 1.4milliohms Rds on at 4.5Vgs. 1.3mohm at 10Vgs. The IRF2804 gets hotter driven the same way.
Last edited by rcheshire; 26-11-2013 at 09:53 AM.
|