I have a little cheap China PWM controller, it ranges from 10Hz to 150KHz, is there a 50ish amp (heatsink'ed) mosfet out there that can handle the frequency?

Thanks

 

I have a little cheap China PWM controller, it ranges from 10Hz to 150KHz, is there a 50ish amp (heatsink'ed) mosfet out there that can handle the frequency?

Thanks

It depends entirely on the gate drive of the "little cheap China PWM controller". Your question is impossible to answer without a schematic.

 

It depends entirely on the gate drive of the "little cheap China PWM controller". Your question is impossible to answer without a schematic.

How do find or measure that?

 

Amps.

 

what is it that you really have there? picture is worth 1000 words...

 

Like this thing:

https://es.aliexpress.com/item/1005...Ud6nHAYOaV4y3_SgODHhf15Z4qWsJxI4aApzXEALw_wcB

 

Sorry, I can’t see the schematic.

 

is there a 50ish amp (heatsink'ed) mosfet

50A or 5A?

 

Ive got one very similar to that, the output on that is 5amps, what I want to do is use that to drive a 50 amp'ish fast switching mosfet

 

How do find or measure that?

You look at the gate charge requirement, in coulombs, for turn on and turn off. You need enough current from the driver to get you past the Miller plateau in both directions: on and off. That is what governs the switching time. Normally this will require a push-pull driver. It is impossible to tell anything about that capability of your "little cheap China PWM controller" WITHOUT A SCHEMATIC diagram. Why are you ignoring that request?

ETA: I'm guessing you don't have ready access to a schematic diagram and lack the ability to create one of your own. I guess that leaves with engineering by experiment. Buy the MOSFET of your dreams and try it. If it works – great! If it doesn't try additional MOSFETs or controllers until you find a combination that works. I know that sounds inefficient, but if that is the only trick in your bag – what choice do you have?

 

Why are you ignoring that request?

Real sorry I am not ignoring, I dont have a schematic diagram at the mo, I think I did have a while back with the help from you guys, I'll have to see if I can find it, problem is Im old, my memory is failing rapidly + a few other issues that dont help my case

Thanks anyway

 

If You have the experience to create a simple Perf-Board-Circuit of your own,
You can use the brute-force method, and just install a high-Current-Gate-Driver.

If You are limited to cheap Chinese "Modules",
then there's no way to guarantee your success.

It would help tremendously if You would provide as much information as possible
about the purpose of your Project, and all of the other Specifications that You want.
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Is there something out there that is not a cheap China pwm module that you guys could recommend, the only reason I got this is it was the only thing available when I done a search

 

Since You have to ask the question ..........
This would indicate that You don't have very much experience in Electronics yet.

Explaining exactly what You are trying to accomplish would get You more useful replies.
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This would indicate that You don't have very much experience in Electronics yet.

your exactly correct,,, that is why Im here asking questions,, we all had to start somewhere

All I want is a PWM controlled mosfet,,,, for 12v lights,, motors, solenoids and anything that can be PWM controlled

I'm sorry if I'm not up to your standards,,, this forum used to fantastic and very helpful, if you look,, ive been a member for a long time,,,, looks like now some of you only want the top guys as members and non experienced thickos like myself your not happy with,,,, best thing,,, ignore my post and I'll wait for someone to help

Thanks anyway

 

Without having some indication of your experience and capabilities
it's almost impossible to make any recommendations.

It's not a personal insult.

You are asking an incredibly broad and open-ended question, without any of the required details.
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In over 50 years of doing hobby electronics, I have never had a need for switching 50A. Do you actually have something in mind that needs that, or is that number just a WAG (wild ass guess)?

 

your exactly correct,,, that is why Im here asking questions,, we all had to start somewhere

All I want is a PWM controlled mosfet,,,, for 12v lights,, motors, solenoids and anything that can be PWM controlled

I'm sorry if I'm not up to your standards,,, this forum used to fantastic and very helpful, if you look,, ive been a member for a long time,,,, looks like now some of you only want the top guys as members and non experienced thickos like myself your not happy with,,,, best thing,,, ignore my post and I'll wait for someone to help

Thanks anyway

You may think that this is a common, simple straight forward question to ask. In fact, it represents a significant design challenge, thus the request for clarification. If I go to Digikey and use their selection guide for a device that will sink 50 Amperes that will be a starting point. I like to include a little headroom so I chose 75 Amperes. Three parts came up in that search. One was in a TO-220 package and two were in a DFN5060 package which are surface mount devices. The TO-220 part is:

MCP75N10Y-BP

Datasheet Link:
MCP75N10Y(TO-220ABH).pdf (mccsemi.com)

The total gate charge is 32 nC, and the rise time and turn on delay are given as 50 ns and 10 ns respectively. The turn off characteristics, fall time and turn off delay, are better at 23 ns and 3.8 nas respectively. You don't get those time with a simple driver for the gate. You need an active current source and current sink to get there.