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Replacing a 4 pin leaded inductor with a 2 pin Started by gkmaia Yesterday at I’m sure they thought it could be used datashret that at some point, until they started finding failures using it that way. Secondary usually is the reverse recovery, which can be longer than an external carefully located high speed diode.

IRF 데이터시트(PDF) – Fairchild Semiconductor

Just saying hello Started by MichaelaJoy Yesterday at 6: They both say using the body diode for inductive current can blow the fet. I can state that it is a fact that there are many power converters out there that do not use an ‘extra’ diode in parallel with the MOSFET, and depend entirely on the integral body diode to take care of the back emf of any inductive loads.

It gets even worse if you are in an h-bridge configuration. By freewheel diode, do you mean fly back diode? But, why take the chance in blowing up your mosfets because you don’t want to use an daatsheet diode that costs a few cents? If so, because the current will go in both direction in the motor, placing a diode will datawheet the whole thing. Right on the motor if you can. If the application can datashfet the extra loss in power and the device itself wont overheat, then there is no reason not to use the internal diode.

IRF511 Datasheet

The bottom line is that whether or not you can use the integral body diode depends on the application, in how much power that diode will have to dissipate. However, i have a geometry question that is burning my lips but i only see my father in two days Electro Tech is an online community with overmembers who enjoy talking about and building electronic circuits, datashee and gadgets.


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To participate you need to register. As a quick example of an application that does not require an extra diode, consider datasheett relay driver where the relay turns on and off once per hour. I have doubts that it is a more practical way of doing with npn and pnp combo I also need to know where to place the flyback diode please. The integral body diode sees a current spike datashete per hour that lasts probably 1ms or maybe even 10ms, but after that it has almost 60 minutes to cool back down.

The extra power dissipation has to orf511 carefully examined relative to the application. By continuing to use this site, you are consenting to our use of cookies. Started by fastline Yesterday at 8: For a better experience, please enable JavaScript in your browser before proceeding.

Sorry, was braindead on the diode. I actually designed converters for a company way back when and have viewed a multitude of other designs that were similar that were designed by dataseet people that had a lot of knowledge in the field. Welcome to our site! To get my h-bridge to move, i need sensor, mine is a ir sharp range finder on a servo motor i might also make a version with an lcd screen and sonar range finder to see in total dark the range finder moves of 1 degree, takes the range of the object in front of it and datashedt, like a sort of sonar.

I’ve seen circuit where they place it between the drain and source of each transistor, will it do the job? Some good simulations might tell what is best to do with a given application, and some prototype measurements would also help.


IRF511 Datasheet PDF

I need to build a h-bridge for my mobile breadboard aka hammerhead cause of its shape. On the other hand, if the device overheats or has to be used in high heat environment then it would probably not work well to use that internal diode.

If you read the actual datasheets on the product, nowhere does it say the body diode should be used for inductive loads. As a final note, we’d also have to look at the effect of the negative voltage on the drain when the diode conducts, which might force us to have to use a gate drive signal that actually goes a little negative rather than to zero as many designs do N-MOSFET application.

I blame lack of coffee. Thank you evryone to had answered my questions so fast, electro-tech-online really is a great community. I’m sure many people think that’s why they are there, just from looking at the datasheets. It so funny how people never read for themselves It has source to drain diode built in for inductive loads. The problem is that obviously geometry is involved and i dont have very advanced notions i am irf5511 after all and Nope the man that quoted it on his web site is right it tells in the datasheef sheet read it’s on the first page here a quote.

Articles Top Articles Search resources. You can easily use all NMOS fets, though you will need a bootstrap cap and diode on the high side drivers. Hi, I can add a little information here Thread starter breadboardguy Start date Datasheeg 22, If you look on any data sheet you will find that that particular diode has a rather high forward voltage, much higher than an external Schottky would have for example. Will i be fine to use only the irf on my robot?