Guest Aliyu Umar Posted September 5, 2011 Report Share Posted September 5, 2011 Hi allI 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. Quote Link to comment Share on other sites More sharing options...
indulis Posted September 6, 2011 Report Share Posted September 6, 2011 Where did you tie the "Adj" pin of the LM236-5 (D2)? It should be ties to the cathode if you wanted a 5V reference.Are you relying on "T1 & R2" to make it constant current? Don't! Quote Link to comment Share on other sites More sharing options...
Guest Aliyu Umar Posted September 7, 2011 Report Share Posted September 7, 2011 Hi IndulisThank 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. Quote Link to comment Share on other sites More sharing options...
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