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The standard mosfet IRF series etc is designed to run from 10V. Here’s the Yahoo home page: OK I try again: Learn how your comment data is processed.

However it has a very low Rdson. But suppose the FET you choose has 0. 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”. You are commenting using your Facebook account. Perhaps it is a lose wire or something. Somehow Logic P channel mosfetsarent as plentiful. I will use Arduino to dim the power acording to inputs from handlebar.

Should you however be stuck with a FET like the IRF that really needs a high voltage to switch efficiently then use the following circuit: I guess what you really need to pay attention to is Rds on at 7V, and the datasheet will usually divulge that. Mar 30, 1.

Mar 31, 3. Looking at those graphs one can see that at a gate to source level of 5V Arduino levels the IRF is only capable of delivering ddatasheet Amp, whereas it is specified for 5,6 Amps continuous current. Post was not sent – check your email addresses! Switching speed indeed is important. Also, if you have the gate floating, the state of the mosfet could be undefined. If you come up with an idea I would be happy to hear it.


Not an ideal choice, but a good one.

Good luck with your project. I am not sure if there is an easier way to do it.

Also easier if you need datazheet do high side switching. Same specs but logic level is what I’d recommend, but I sorta doubt there is such a beast. Content is available under Attribution 3. My questions please – 1 Is the IRF OK for this application or is there another device that would be better suited?

IRF equivalent datasheet & applicatoin notes – Datasheet Archive

The more expensive has lower Rds, and the TO package is pretty much limited to 75A of sustained current for thermal reasons, so it will be interesting to see if there’s much performance difference. The driver will have only 2 inputs, allowing off, fw, datqsheet and brake. But where can I find K in the datasheet? But to be sure i had a question.

Mar 31, 4. Thanks again Wayneh and Sgt for your advice. Well, you would need to put an inverter before the circuit i provided, either by datasheey logical gate or with yet another transistor. Then you can find the current in the datasheet? Rds 38mOhm with a Vgs of 3. I am using this converter: See the reference below:.


Thank you for the clear explanation.

Datazheet transistor may burnt. That is always a special situation coz of the huge spikes you can get in the coil. Here’s another; the Rds on is 1. This site uses cookies. Thanks for your reply Wayneh, I’ll keep that in mind. The relatively cheap BUZ11 is also an option.

Good overview of the theory here: You are commenting using your Twitter account.

IRF1405 MOSFET. Datasheet pdf. Equivalent

Fill in your details below or click an icon to log in: Well, usually folks would recommend a logic-level FET for a 7V gate voltage. It has a pretty hefty gate charge, so you won’t want to be turning it on and off very frequently.

Also the and will be more efficient with this circuit.