understanding PCB transformer specs right???

[ahmed osama]

dear all
do i understand the following specs for a PCB transformer right ????

the output power = 3.2VA * 0.6 (efficiency ) = 1.92 VA

so max output current = 1.92 / 6Vac = 0.32 A ac



thanks all

 

[rfredel]

Hello Ahmed,

your calculation is wrong. The output power is 3,2 VA. That gives an current of 0,533 A.

The efficiency is factor, how much power is loss in the core and the copper windings.

For an ideal transformer the input and the output power are equal, but a real transformer has losses. For your transformer is this 60% more input than output. So you have an input power of 5,33 VA.

Regards

Rainer