hi ,

I am using a switching regulator to convert 15V to 5V.
can someone please tell me the formula to determine the power consumption of the switching regulator.
its urgetn.
thanks in advance.

 

hi ,

I am using a switching regulator to convert 15V to 5V.
can someone please tell me the formula to determine the power consumption of the switching regulator.
its urgetn.
thanks in advance.

Its 15V times the input current.

 

Its 15V times the input current.

and how do you arrive at that..
dont we need to do somthing like in linear regulator:
(Vin - Vout)* Iout

oe dont we need to consider efficiency of the regulator for this..?

 

I told how to calculate the total input power to the converter.
If you want to calculate the lost power in the converter then:

Lost power=Vin*Iin-Vout*Iout

 

I told how to calculate the total input power to the converter.
If you want to calculate the lost power in the converter then:

Lost power=Vin*Iin-Vout*Iout

yes I think there I am,..
Pin-Pout is the power consumed by the regulator..
but if i calculate(Pin-Pout)/Pin what do I end up with..?

 

yes I think there I am,..
Pin-Pout is the power consumed by the regulator..
but if i calculate(Pin-Pout)/Pin what do I end up with..?

It is not the efficiency but it can be used as another way to measure efficiency. It will give you the ratio of the lost power according to the input power.

Efficiency equals Pout/Pin.

 

Hello,

I would say Pin = Pout / efficiency factor.
Pin = Iin * Uin
Pout = Iout * Uout.
The efficiency factor can be between 0.8 (for a poor DC / DC converter)
and 0.95 (for a reasonable DC / DC converter)

Bertus