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Lets take that number down to the graph at Figure 4. You must log in or register to reply here. It comes down to the fact that the current rating of most mosfets is a calculated number as to what current will put the junction temperature at it’s failure point when the case is at 25C. 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.

A project I am doing right now needs to switch 60Amps DC. Doable in a cryogenics lab, but not really a practical value for most real world applications. The unit belongs to a neighbour and he said it just quit working; he doesn’t know if it was running hot before it quit. Pins 11 and 14 are the 2 outputs of the chip. Articles Top Articles Search resources. Not as easy as it sounds. They are mounted on a large aluminum heatsink and the unit also has a cooling fan. Datasheets, Manuals or Parts.

If so, can you suggest some part numbers? So when carrying 14 amps, it will be dissipating about 78 watts of heat.


IRFP MOSFET Datasheet pdf – Equivalent. Cross Reference Search

My circuit is 15 volts. One of the pair dataaheet The sum of the junction to case and the case to sink resistances is 0.

A bigger switch always puts a bigger Ciss load on the gate. Replacement Transformer Started by ncag Today at 7: I am assuming these are too light daatsheet the duty they are trying to perform and would like to try and replace them with heavier Mosfets. Often the input FETs are just the weak link and something else is the real culprit. Tc is case temperature, not ambient.

What are you doing with it?

IRFP450 MOSFET. Datasheet pdf. Equivalent

By continuing to use this site, you are consenting to our use of cookies. So it will only handle 14 amps continuous if the case is kept at 25C all of the time. Click here to register now.

You haven’t said what how you are using the mosfet, so it’s difficult to accurately answer your question. So, at 78 watts, the junction is 69 degrees hotter than the case. You need to know what affect other parameters may have on your circuit.

Thread starter Ken1 Start date Feb 28, Electro Tech is an online community with overmembers who enjoy talking about and building electronic circuits, projects and gadgets.

Maybe a little overkill but, other than the copper plates that carry the current, there is no heatsink.

This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. Ken1 Member Feb 28, Ken1 Member Mar 1, Misterbenn Active Member Mar 1, Give them a good look, especially those close to the hot heat sink.


Electrolytic caps are a prime suspect. I am assuming these are too light for the duty. Potentiometer Questions Started by norbss Yesterday at For irfp450aa better experience, please enable JavaScript in your browser before proceeding.

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

IRFP450 Mosfet Question

But if increased current capacity is your only goal, there is a big trap you need to look out for. One important fact that everyone need to be aware of when choosing mosfets, is that the current rating has a irffp450a print disclaimer that causes problems if not taken into account. Media New media New comments Search media.

It seems this “entry level” charger” has very little margin before exceeding the component limits. So, it will only carry 14 amps if you can keep the case at 25C while it is pushing out 78 watts of heat. If the impedance gain or resistance gain is too high, you need more stages of MOSFET buffering to prevent overloading the gate resistors due to Qgs charge switch losses and switch frequency.

Don’t forget to check the caps. We need to recalculate everything again based on the new info. Nice power supply by the way.

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