Rajnaveen
Member level 2

Hi friends;
I am using MOSFET IR840 in a solar charge controller . I have placed a heatsink for cooling purpose . when charger run continuously for 4-5 hour heatsink temp raise to 70 deg at 30 deg ambient . I question is that how could i calculate the derating of mosfet ? so that i can assure that the mosfet i am using will work for 1 year or 2.
please suggest ur views.
I am using MOSFET IR840 in a solar charge controller . I have placed a heatsink for cooling purpose . when charger run continuously for 4-5 hour heatsink temp raise to 70 deg at 30 deg ambient . I question is that how could i calculate the derating of mosfet ? so that i can assure that the mosfet i am using will work for 1 year or 2.
please suggest ur views.