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One of the pair of Ken1 Member Feb 28, So, at 78 watts, the junction is 69 irfp450x hotter than the case. This means that the the junction is. The unit is relatively new and hasn’t seen much use.

IRFP450 MOSFET. Datasheet pdf. Equivalent

The sum datqsheet the junction to case and the case to sink resistances is 0. You need to know what affect other parameters may have on your circuit.

There is also a visible crack in the case of the same Mosfet. Datasheets, Manuals or Parts. This is determined by the V-I slope of dataeheet driver and RdsOn of the switch. Click here to register now. For a better experience, please enable JavaScript in your browser before proceeding.

IRFP MOSFET Datasheet pdf – Equivalent. Cross Reference Search

To participate you need to register. They are mounted on a large aluminum heatsink and the unit also has a cooling fan.

My rule of thumb is the impedance of each stage, where the ratio of impedances of successive stages should not exceed and ought to be in the 10 range, so that RC dynamic losses don’t dominate and exceed conduction losses. So when carrying 14 amps, it will be dissipating about 78 watts of heat.


Give them a good look, especially those close to the hot heat sink. Welcome to our site! This is the datasheet I used for this discussion. My circuit is 15 volts. Potentiometer Questions Started by norbss Yesterday at Misterbenn Active Member Mar 1, Media New media New comments Search media.

So, if you’re looking ifrp450a a mosfet to continuously carry 20 amps, you will probably need a mosfet s with current capacity 3 to 10 times 20 amps.

Nice power supply by the way. Forums New posts Daasheet forums. A project I am doing right now needs to switch 60Amps DC. Don’t forget to check the caps. So, it will only carry 14 amps if you can keep the case at 25C while it is pushing out 78 watts of heat.

IRFP Mosfet Question | Electronics Forum (Circuits, Projects and Microcontrollers)

I am assuming these are too light for the duty. One important fact that everyone need to be aware of when choosing mosfets, is that the current rating has a fine print disclaimer that causes problems if not taken into account. I am attempting to repair a Powermax PM power supply unit.

It seems this “entry level” charger” has very little margin before exceeding the component limits.

So it will only handle 14 amps continuous if the case is kept at 25C all of the time. Replacing a 4 pin leaded inductor with a 2 pin Started by gkmaia Yesterday at The unit belongs to irdp450a neighbour and he said it just quit working; he doesn’t know if it was running hot before it quit.


IRFP450A MOSFET. Datasheet pdf. Equivalent

A bigger switch always puts a bigger Ciss load on the gate. Often the input FETs are just the weak link and something else is the real culprit.

Maybe a little overkill but, other than the copper plates that carry the current, there is no heatsink. I am assuming these are too light for the duty they are trying to perform datashee would like to try and replace them with heavier Mosfets. It comes down to the fact that the current rating of most mosfets irp450a a calculated number as to what current will put the junction temperature at it’s failure point when the case is at 25C.

datashert Ken1 Member Mar 1, You haven’t said what how you are using the mosfet, so it’s difficult to accurately answer your question. As Tony points out, there will usually be some other parameter that changes along the way. I am using four amp mosfets. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.