# dc ot dc converter

#### sujinvipin

Joined Aug 18, 2011
28
i have a dc to dc converter of 48V input and 24 volt output giving 20 Amp maximum output current , now how can i calculate the current input or drawn by the converter?

#### SgtWookie

Joined Jul 17, 2007
22,221
PowerOut = PowerIn / ConverterEfficiency
Vout * Iout = Vin * Iin / ConverterEfficiency
24V * 20A = 48V * ?? / ??

Substitute, isolate the unknowns and solve.

#### sujinvipin

Joined Aug 18, 2011
28
Shall i confirm with it or is there any better solution

#### SgtWookie

Joined Jul 17, 2007
22,221
What is the problem? Is that too complicated?

If you don't know the converter efficiency, you will need to calculate it by:
Efficiency = PowerOutput / PowerInput
You already know the output power requirement, correct? 24v * 20A = 480 Watts.
You already know the input voltage, correct? 48V, right?

So, you need to at least find out one of the two missing variables; input current, or converter efficiency.

If you don't know what the converter efficiency is, then guess low. Estimate 75% to 80%.