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Replacing a 4 pin leaded inductor with a 2 pin Started by gkmaia Yesterday at Ken1 Member Mar 1, Tc is case temperature, not ambient.

Lets take that number down to the graph at Figure 4. You haven’t said what how you are using the mosfet, so it’s difficult to accurately answer your question. One of the pair of datasyeet Often the input FETs are just the weak link and something else is the real culprit.

This is the datasheet I used for this discussion.

Otherwise you’ll need to resort to cold water or refrigerated cooling. Give them a good look, especially those close to the hot heat sink. Don’t forget to check the caps.

IRFPA Datasheet(PDF) – International Rectifier

Thread starter Ken1 Start date Feb 28, Datasheets, Manuals or Parts. This is determined by the V-I slope of the driver and RdsOn of the switch.

The sum of the junction to case and the case to sink resistances is 0. Welcome to our site! This means that the the junction is. Pins 11 and 14 are the 2 outputs of the chip.

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.


A project I am doing right now needs datashest switch 60Amps DC. Doable in a cryogenics lab, but not really irfp4550a practical value for most real world applications. I am assuming these are too light for the duty. There is also a visible crack in the case of the same Mosfet. Electrolytic caps are a prime suspect. But if increased current capacity is your only goal, there is a dataasheet trap you need to look out for.

You must log in or register to reply here. If so, can you suggest some part numbers? I am using four amp mosfets.

IRFPA Datasheet(PDF) – Inchange Semiconductor Company Limited

I am attempting to repair a Powermax PM power supply unit. Click here to register now. Maybe a little overkill but, other than the copper plates that carry the current, there is no heatsink. Nice power supply by the way.

IRFP450A Datasheet PDF

So it will only handle 14 amps continuous if the case is kept at 25C all of irf4p50a time. 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.

It seems this “entry level” charger” has very little margin before dxtasheet 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.

Articles Top Articles Search resources. That’s way too low as this power supply is powered by VAC which is fed through a datazheet rectifier, then filtered with an uF V capacitor then fed to the Mosfets through the SMPS transformer. Potentiometer Questions Started by norbss Yesterday at Electro Tech is an online community with overmembers who enjoy talking about and building electronic circuits, projects and gadgets.


If datawheet case is at 25C, the junction is at 94C. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.

You need to know what affect other parameters may have on your circuit. Ken1 Member Feb 28, 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 irfp450s the 10 range, so that RC dynamic losses don’t dominate and exceed conduction losses.

IRFP450 MOSFET. Datasheet pdf. Equivalent

Misterbenn Active Member Mar 1, 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.

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. So when carrying 14 amps, it will be dissipating about 78 watts of heat.

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

Replacement Transformer Started by ncag Today at 7: