hi, am so greatful for whatever your doing cause its wonderful. well i was trying to come up with a charge regulator for a 12V,7Ahr sealed lead acid battery. i used the mc34063 IC as a step-down together with its associated electronic components as in the systematic lay out in the step-down configuration.
i supplied the regulator with 20VDC and i wanted 14.7VDC out and a current of 0.8A.
it regulated the voltage very well and i think the current too.
however it heat up in 1.5munites just after i had connected the battery on it; and the temperature shot to 210 o F in 4 minutes.
As the temperature goes high, the current from the power supply decreases and the current to the battery also decreases.
i tried cooling the IC by attaching a heat sink on to it but still the temperature shot up to 230 o F. i beg for any solutions and advice on what to do.
i supplied the regulator with 20VDC and i wanted 14.7VDC out and a current of 0.8A.
it regulated the voltage very well and i think the current too.
however it heat up in 1.5munites just after i had connected the battery on it; and the temperature shot to 210 o F in 4 minutes.
As the temperature goes high, the current from the power supply decreases and the current to the battery also decreases.
i tried cooling the IC by attaching a heat sink on to it but still the temperature shot up to 230 o F. i beg for any solutions and advice on what to do.