IRFP N – CHANNEL V – Ω – 14A – TO PowerMESH™ MOSFET s . TYPICAL RDS(on) = Ω s. EXTREMELY HIGH dv/dt CAPABILITY. IRFP 14A, V, Ohm, N-channel Power MOSFET. This N-Channel enhancement mode silicon gate power field effect transistor is an advanced. IRFP V. DSS. = V. I. D(cont). = 14 A. R. DS(on). = Ω. G = Gate,. D = Drain,. S = Source,. TAB = Drain. Features l International standard packages.
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Lets take that number down to the graph at Figure 4.
A project I am doing right now needs to switch 60Amps DC. Take a look at this one.
Don’t forget to check the caps. This is the datasheet I used for this discussion. The unit is relatively new and hasn’t seen much use. Doable in a cryogenics lab, but not really a practical daatasheet for most real world applications. My circuit is 15 volts. That’s way too low as this power supply is powered by VAC which is fed through a bridge rectifier, then filtered with an uF V capacitor then fed to the Mosfets through the SMPS transformer.
Tc is case temperature, not ambient.
(PDF) IRFP450 Datasheet download
So, at 78 watts, the junction is 69 degrees hotter than the case. Often irffp450 input FETs are just the weak link and something else is the real culprit. Ken1 Member Mar 1, 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.
So it will only handle 14 amps continuous if the case is kept at 25C all of the time.
They are mounted on a large aluminum heatsink and the unit also has a cooling fan. The unit belongs to a neighbour xatasheet he said it just quit working; he doesn’t know if it was running hot before it quit. I am assuming these are too light for the duty they are trying to perform and would like to try and replace them with datasjeet Mosfets.
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. I am using four amp mosfets. Potentiometer Questions Started by norbss Yesterday at But if increased current capacity is your only goal, there is a big trap you need to look out for. There is also a visible crack in the case of the same Mosfet.
Pin 11 which the burned resistor connects to has a very low resistance jrfp450 ground compared to pin If the impedance gain or resistance datasheey is too high, you need more stages of MOSFET buffering to prevent overloading the gate resistors due to Qgs irfo450 switch losses and switch frequency. So when carrying 14 amps, it will be dissipating about 78 watts of heat. The battery charge may not have intelligent soft start and overstress the charger hooking up to a dead battery.
IRFP Datasheet PDF –
It seems this “entry level” charger” has very vatasheet 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. Let’s look at a few items from the datasheet. Otherwise you’ll need to resort to cold water or refrigerated cooling.
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.
Thread starter Ken1 Start date Feb 28,