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Battery charger over heating

Guest Aliyu Umar

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Guest Aliyu Umar

Hi all
I built the below circuit diagram wish i search from the net, the charger works ok but the Mosfet transistor dissipates a lot of heat even when the charging current is in mili-amperes, the cooler attached to it got extremely hot. Please is there any idea on how to run this charger cool. I will be grateful for any assistance. 


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Guest Aliyu Umar

Hi Indulis

Thank you for the reply, I used a 5.1v Zener for the reference diode.

My intention  is to charge SLA battery with 1.2A so I don't rely on T1 and R2 for the constant current.

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