I am designing a LED Headlight for my car. But I am confused about my BJT, I dont know if it is suitable or not. The overall design is given below.
The problem is, when I run the ckt under engine off (power source is the battery, 11.86v) then there is no problem, even all the components are ice cool. But when I start the engine (power source becomes the dynamo, 13.5v) then in 2 seconds I start to see smoke from the BJT and just under 5 seconds it is blown. I see a small hole up on the emitter pin. Can anybody tell me what could be the reason?
Besides, if you want datasheet, all the model numbers are given in the diagram. If you want to know, I couldn't find any data sheet for my LEDs so I measured the amps on my own, I am giving you a link of those LEDs.