power loss of mosfet

MAINAHNOUD

Joined Jul 24, 2019
60
is the power loss of mosfet equal current^2 * Ron?
so, how can i calculate the power loss on it?

ronsimpson

Joined Oct 7, 2019
724
Power = current^2 * Resistor
current^2=current * current=current squared
This is only the DC loss.

dl324

Joined Mar 30, 2015
10,988
is the power loss of mosfet equal current^2 * Ron?
$$P = IV = I^2R = \frac{V^2}{R}$$

Since you don't know R, current time voltage would be more reliable.

MAINAHNOUD

Joined Jul 24, 2019
60
Power = current^2 * Resistor
current^2=current * current=current squared
This is only the DC loss.
So, what is the other power loss?

MAINAHNOUD

Joined Jul 24, 2019
60
$$P = IV = I^2R = \frac{V^2}{R}$$

Since you don't know R, current time voltage would be more reliable.
R is on datasheet right?
Power loss is due to resistance right?

dl324

Joined Mar 30, 2015
10,988
R is on datasheet right?
The datasheet doesn't give you a way to determine ON resistance unless you're operating at the conditions they specified.

This is for IRF530:

If you're operating at Vgs=10V and Id=8.4A, the Rmax is 0.15 ohms. It could be less, but they don't say how much less. If you operate at different conditions, resistance will be different.

dl324

Joined Mar 30, 2015
10,988