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Mar 30, 1.
IRF1405 MOSFET. Datasheet pdf. Equivalent
Mar 30, 3 0. The gate V is 7V from a separate supply.
The device will be either fully on or off as selected. The initial bench test was quite promising, the heat sink barely warm at 38A. My questions please – 1 Is the IRF OK for this application or is there another device that would be better suited?
Thanks for any replies. Mar 31, 2.
IRF Power MOSFET (A) | International Rectifier
Sep 9, 15, 5, Mar 31, 3. Thanks for your reply Wayneh, I’ll keep that in mind. Is there another device that might be better suited?
Mar 31, 4. Well, usually folks would recommend a logic-level FET for a 7V gate voltage. It’d be fully on by 4V or so, versus the needed by the regular FET. But you’re dealing with some whopping currents and I don’t have any particular device to recommend. Same specs but logic level is what I’d recommend, but I sorta doubt there is such a irf4105.
I guess what you really need to pay attention to is Rds on at 7V, and the datasheet will usually divulge that. The Rds on resistance is what will cause heating. If your current choice has a lower Rds than a lesser-spec logic-level FET, it’ll generate less heat even though it’s less “on”.
Mar 31, 5. Jul 17, 22, 1, You might go for something like this one: It has a pretty hefty gate charge, fatasheet you won’t want to be turning it on and off very frequently.
Here’s another; the Rds on is 1. Rds on is up to 1. Apr 1, 6.
Thanks again Wayneh and Sgt for your advice. If I parallel two devices can I connect the two gates together or should I separate each with a resistor?
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