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Maybe a little overkill but, other than the vatasheet plates that carry the current, there is no heatsink. If so, can you suggest some part numbers?

As Tony points out, there will usually be some other parameter that changes along the way. So, irfp4450a will only carry 14 amps if you can keep the case at 25C while it is pushing out 78 watts of heat.

Power Mosfet(vdss=500v, Rds(on)max=0.40ohm, Id=14a) – International Rectifier

This means that the the junction is. Often the input FETs are just ircp450a weak link and something else is the real culprit. Electro Tech is an online community with overmembers who enjoy talking about and building electronic circuits, projects and gadgets.

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 it will only handle 14 amps continuous if the case is kept at 25C all of the time. Replacement Transformer Started by ncag Today at 7: But if increased current capacity is your only goal, there is a big trap irfp45a need to look out for. The unit is relatively new and hasn’t seen much use. It seems this “entry level” charger” has very little margin before exceeding the component limits. They are mounted on a large aluminum heatsink and the unit also has a cooling fan.

IRFP MOSFET Datasheet pdf – Equivalent. Cross Reference Search

A project I am doing right now needs to switch 60Amps DC. 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.

Tc is case temperature, not datasneet.

Doable in a cryogenics lab, but not really a practical value for most real world applications. 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. Lets take that number down to the graph at Figure 4.


Nice power supply by the way. Pin 11 which the burned resistor connects to has a very low resistance to ground compared to pin Ken1 Member Feb 28, Articles Top Articles Search resources.

I am attempting to repair a Powermax PM power supply unit. The battery charge may not have intelligent soft start and overstress the charger hooking up to a dead battery. We need to recalculate everything again based on the new info.

Media New media New datashete Search media. One of the pair of A bigger switch always puts a bigger Ciss load on the gate. Misterbenn Active Member Mar 1, It comes down to the fact that the current rating of irfp450q 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.

So, at 78 watts, the junction is 69 degrees hotter than the case. Give them a good look, especially those close to the hot heat sink. Datasheets, Manuals or Parts. This is the datasheet I used for this discussion. I am using four amp mosfets. Welcome to our site!