24V 200mA to 12V 3Amps

Discussion in 'General Electronics Chat' started by rmrps, Jul 14, 2015.

1. rmrps Thread Starter New Member

Feb 24, 2012
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0
Hi friends
I am having 24v 200ma power supply i have to convert it into 12v 3amps supply how can i convert it if i am giving input of 24v 200ma to lm350 regulator it will convert 12v 3amps is this correct or what will be the best method to decrease the volt into 12v and increase current into 3amps please give me your guidance

Apr 5, 2008
15,647
2,346
Hello,

You will NEVER get more power out of a circuit than you put in.
Your input is 24 Volts X 0.2 A = 4.8 Watts.
Even when you use a good quality switching regulator (95 % efficiency), you will get a max of about 380 mA at 12 Volts.

Bertus

Feb 24, 2012
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4. AnalogKid Distinguished Member

Aug 1, 2013
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1,251

First, your source power is 24 V at 200 mA, or 4.8 W, while your load power is 12 V at 3 A, or 36 W. The only way to deliver 36 W to the load is to have more than 36 W available at the source.

Second, and LM350 is a linear regulator, not a switching power converter. A linear regulator can regulate a 24 V source down to 12 V, but the output current will still be only 200 mA. A switching power converter can regulate the input down to 24 V *and* deliver a corresponding increase in output current (minus circuit inefficiencies). So with your source the output current might be 320 mA. Better than 200 mA, but still not anywhere near 3 A.

ak

5. mcgyvr AAC Fanatic!

Oct 15, 2009
4,769
969
Time to buy a different power supply..