Posted on April 28, 2019


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What are you doing with it? Maybe a little overkill but, other than the copper plates that carry the current, there is no heatsink. Nice power supply by the way. You need to know what affect other parameters may have on your circuit. This means that the the junction is. Welcome to our site! By continuing to use this site, you are consenting to our use of cookies.

Not as easy as it sounds. Often the input FETs are just the weak link and something else is the real culprit. The unit belongs to a neighbour and he said it just quit working; he doesn’t datasbeet if it was running hot before it quit.

Misterbenn Active Member Mar 1, Thread starter Ken1 Start date Feb 28, If so, can you suggest some part numbers?

But if increased current capacity is your only goal, there is a big trap you need to look out for. Let’s look at a few items from the datasheet. This is the datasheet I used for this discussion.

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 circuit is 15 volts. Lets take that number down to the graph at Figure 4. The unit is relatively new and hasn’t seen much use. 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.

You haven’t said what how you are using the mosfet, so it’s difficult to accurately answer your question. So when carrying 14 amps, it will be dissipating about 78 watts of heat. 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.

Doable in a cryogenics lab, but not really a practical value for most real world applications. Ken1 Member Feb 28, For a better experience, please enable JavaScript in your browser before proceeding. Media New media New comments Search media. I am assuming these are too light for the duty they are trying to perform and would like to try and replace them with heavier Mosfets.

One of the pair of If the impedance gain or resistance gain is too high, you need irfo450a stages of MOSFET buffering to prevent overloading the gate resistors due to Qgs charge switch losses and switch frequency.

If the case is at 25C, the junction is at 94C. As Tony points out, there will usually be some other parameter that changes along the way. Tc is case temperature, not ambient.

IRFPA Datasheet(PDF) – Inchange Semiconductor Company Limited

Forums New posts Search forums. Datasheets, Manuals or Parts. Don’t forget to check the caps. The battery charge may not have intelligent soft start and overstress the charger hooking up to a dead battery. A project I am doing right datsheet needs to eatasheet 60Amps DC. So, it will only carry 14 amps if you can keep the case at 25C while it is pushing out 78 watts of heat. The sum of the junction to case and the case to sink resistances is 0.


Articles Top Articles Search resources. 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.

Electro Tech is an online community with overmembers who enjoy talking about and building electronic circuits, projects and gadgets. So it will only handle 14 irfp450aa continuous if the case is kept at 25C all of the time.

IRFP450A Datasheet

I am assuming these are too light for the duty. I am attempting to repair a Powermax PM power supply unit. Replacement Jrfp450a Started by ncag Today at 7: Replacing a 4 pin leaded inductor with a 2 pin Started by gkmaia Yesterday at Potentiometer Questions Started by norbss Yesterday at Ken1 Member Mar 1, There is also a visible crack in the case of the same Mosfet.

You must log in or register to reply here. I am using four amp mosfets. Electrolytic caps are a prime suspect.