I hooked them up properly, heat skined them. So when the voltage at the gate was zero, 6 amps were running through the mosfet. 40% of the current I was running through it. They are rated for 30 amps right? Well ran 20 amps through one, and after a few cycles. I had 2 left, and I was building a motor controller. Well 2 of them broke int hat case, they would not close the damn circuit! They leaked 10% of the current I was running through them. I had 4 left, and I used them for some bread board prototyping. All the mosfets started to leak current, well 4 of them I used for the inverter. I built a light duty inverter with them, pushing no more than 1 amp at 5 volts. A dollar for a 30 amp mosfet? Wow, that was a great deal. If the device is mounted to an extremely good heat sink that maintains the case temperature at 5 0 ∘ C, what is the maximum allowable current pulse magnitude? You may assume that the MOSFET on-state resistance is always at its 15 0 ∘ C value.Well, These mosfets looked like a great deal when I first saw them. Suppose the device is instead operated in a pulsed fashion, carrying large pulses of current 800 μ s in duration with 79.2 ms of off time between pulses. What is the maximum allowable thermal resistance of the heat sink ? B. The MOSFET is attached to a heat sink using an insulating pad with a maximum thermal resistance of 0.7 5 ∘ C / W. Assume that the device must carry a (forward) rms current of 40 A, and that switching losses can be ignored. Use the "typical" values instead of the max values (in practice, use max if you want a conservative design!) 4. The on-state resistance of the MOSFET varies with junction temperature, as illustrated in datasheet Fig. You don't always want to push to the full rating. The MOSFET can tolerate a junction temperature of 17 5 ∘ C, but limiting to a lower value can help improve the lifetime/longevity of the device. Assume a maximum allowable junction temperature of 15 0 ∘ C and a maximum ambient temperature of 6 0 ∘ C for this problem. Problem 7.3 Download the datasheet for Infineon power MOSFET IPP051N15N5 available on Canvas.
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