Mosfet question - Page 1
Forum section: electronics / beginners

author: Nickk2057
author_rank: Regular Contributor
timestamp: April 08, 2013, 08:14:30 am
content: what Mosfet transistors are good to use for using in a high current low voltage environment?

author: amspire
author_rank: Super Contributor
timestamp: April 08, 2013, 09:12:30 am
content: Quote from: Nickk2057 on April 08, 2013, 08:14:30 amThe obvious answer is high current (low Rds), low voltage Mosfets.But it depends totally on the application. In some applications, you can get away with a tiny smd package. In other cases, you need a large 400W rated package on a big heatsink.Are you using it in switching mode (the mosfet is either hard On or hard Off) or linear mode (includes everything between On and Off)? Good switching mosfets are often not suitable for linear operation.In some cases, switching losses are insignificant. In other cases, switching losses can dominate. The best way to get advice is to be specific about the use.

author: Nickk2057
author_rank: Regular Contributor
timestamp: April 08, 2013, 09:16:19 am
content: well really its for to use for a square wave application

author: Kremmen
author_rank: Super Contributor
timestamp: April 08, 2013, 10:22:02 am
content: Sorry - i don't wish to offend but why is this phase so often like pulling teeth? Now we know that your application is "high current" and "low voltage", and that square waves are involved. The only answer this info is going to get you is, that there are 100 000+ components fulfilling your request. Just close your eyes and pick one from the hat.In case this answer is not satisfactory, please do give more info. For starters, what is "low" voltage and "high" current for you in this context? Square wave to what purpose? In isolation that is meaningless - _all_ switching applications are controlled by a square wave of some kind. The switching frequency and nature of switched load would help enormously.So, please. What is your application and what is your design so far. Knowing that we might be able to help but you have to lift the veil of secrecy to let us do that.

author: amspire
author_rank: Super Contributor
timestamp: April 08, 2013, 10:23:05 am
content: Quote from: Nickk2057 on April 08, 2013, 09:16:19 amStill not enough information. If you don't want to tell us real details that is fine, but we cannot help you.

author: Nickk2057
author_rank: Regular Contributor
timestamp: April 08, 2013, 10:31:13 am
content: trying to make a high wattage inverter circuit... been trying it with the arduino before... (which helped greatly) but want to go in a higher cuit now... like a higher watts that is.... maybe if i can try making a circuit with more PWM poles on the arduino it will go higher watts... i will try that our if that works

author: amyk
author_rank: Super Contributor
timestamp: April 08, 2013, 11:08:39 am
content: Go to one of the big MOSFET manufacturers likeIRand use their parametric search function.

author: Nickk2057
author_rank: Regular Contributor
timestamp: April 08, 2013, 12:27:42 pm
content: ok..... i tried that IR place.... and once i went to the chip selection i got SOOOOOO confused at it..... so i guess its more better on ebay XD

author: c4757p
author_rank: Super Contributor
timestamp: April 08, 2013, 01:15:12 pm
content: What's wrong with the ones you were using? High current rating, low Rds(on). Not many other parameters that are applicable here.

author: Nickk2057
author_rank: Regular Contributor
timestamp: April 09, 2013, 04:56:54 am
content: i just dont want to ruin the ones that is higher when using for the circuit i am using..... so i also don't have much loss in power if i use higher amps

author: codeboy2k
author_rank: Super Contributor
timestamp: April 09, 2013, 05:18:10 am
content: I smell a DIY solar charged battery bank powering a DIY inverter....hey nickk, you've got another thread already going about this don't you?Is this MOSFET question related... good to see how much you're learning in that other thread, but if this question is related why not keep it there?cheeers!

author: Nickk2057
author_rank: Regular Contributor
timestamp: April 09, 2013, 05:30:54 am
content: my apologies.. but i was just wondering if the mosfet question here would be seperate... but i guess it was not O.o

author: smashedProton
author_rank: Frequent Contributor
timestamp: April 09, 2013, 06:05:42 am
content: I really like the irfp250 fet. They are too high for your application though. .. but I use them as my general purpose power fet. Also the irfp460 is good for hv stuff.