P-channel MOSFET as a High side switch | Why is it hard to use N-channel MOSFET as high side switch?

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#foolishengineer #MOSFETdriver #HighsideMOSFETdriver
0:00 Skip Intro
00:35 What is High Side switching
00:59 P-channel MOSFET High Side switching
03:55 P-channel MOSFET vs N-channel MOSFET
05:01 N-channel MOSFET High side switching & limitation
References:
- www.ti.com/lit/ml/slua618a/sl...
- www.vishay.com/docs/91021/irf...
- www.vishay.com/docs/91078/910...
- www.infineon.com/dgdl/Infineo...
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Пікірлер: 74

@chimeranzl9147 2 жыл бұрын

as a beginner in electronics, i spent ages trying to read and understand this concept. thanks for making sense of it - you explanations backed up with examples makes it so much easier to conceptualise!

@FoolishEngineer 2 жыл бұрын

Glad it was helpful! Thank you so much for watching!! Please don't forget to subscribe to our channel

@chimeranzl9147 Жыл бұрын

@@FoolishEngineer how do I use a P channel MOSFET as a high side switch if the gate voltage is from an ESP8266 (3.3V) yet the load (via drain) is 24V? I can never get that voltage differential to turn the MOSFET on? I can't use a N channel MOSFET here as the load has 3 x positive inputs and a common ground.

@mekh3317 9 күн бұрын

thank u for this vid. It really helped me understanding the function of different mosfets and selecting the right mosfet for a power source selection switch.

@emjaycpe Жыл бұрын

By far the best video about mosfet switching on KZfaq. Great job!

@FoolishEngineer Жыл бұрын

Thank you so much! Please show support to my video with Super thanks.

@aduedc 2 жыл бұрын

Hi, I am a chip designer, and I love your clips, because it teaches me how to do many things at the PCB level. In the chip level, we use either a capacitor or butterfly circuit to do this. In capacitor method as you know, we connect the capacitor to ground and Vsup through two switches, then when we want o turn on the high side NMOS switch we We turn the capacitor switches off and connect the ground of capacitor to supply and the other side of the cap to the gate. The gate of NMOS will fly to twice the supply voltage which turn of the NMOS. However, doing this in chip level is easy because the transistors are almost free, but at the PCB level we need four transistors to do that and becoming familiar with the chips that are already available is a blessing and better way to do that. This is why your clips are so interesting to me. Thanks for the good work.

@FoolishEngineer 2 жыл бұрын

Thank you so much for watching!! Please don't forget to subscribe to our channel

@TheAnbyrley Жыл бұрын

I'm becoming curious about the difference between the two design philosophies. Do you have any references for the chip level design? I'm a DSP engineer but like to play around with PCBs.

@Leif_YT 2 жыл бұрын

Thank you for this very useful content. I really like that you separate it in multiple videos. This way it's very detailed and at the same time easy to find what someone is looking for. Great work

@FoolishEngineer 2 жыл бұрын

Glad it was helpful! Thank you so much for watching!! Please don't forget to subscribe to our channel

@palliyil 2 жыл бұрын

Looks like your channel has become a MOSFET dedicated channel now :p But that is a good thing probably. All the relevant information needed in one place. Your videos are at a digestible level for someone who knows some hobby electronics. And I really like that you do not try to pack too much in a single video. Ideal for use in teaching. Wherever someone asks me something related to mosfets i just redirect them to some of your videos. Keep up the great work!

@FoolishEngineer 2 жыл бұрын

Thank you so much for watching!! Please don't forget to subscribe to our channel

@neilnerd8111 Жыл бұрын

Thanks for a clear description of biasing a p channel MOSFET!

@kabuchi254 Жыл бұрын

Your are a Smart Engineer. Getting to learn more that I didnt know from you.

@FoolishEngineer Жыл бұрын

Thank you so much! Please show support to my video with Super thanks.

@SubwayJack919 Жыл бұрын

Concise explanations with excellent visual's!

@FoolishEngineer Жыл бұрын

Thank you so much! Please show support to my video with Super thanks.

@james-sargent Жыл бұрын

you ahve finally made sense of the -V values in p-channel data sheets, I cannot thank you enough :p

@FoolishEngineer Жыл бұрын

No worries!

@Alex-xl4xe 6 ай бұрын

I'll be honest, the accent is a bit difficult for a non-native speaker but you are trying incredibly hard to make it work and that's noticeable, the video quality is top-notch, everything is explained very well and understanble.

@FoolishEngineer 4 ай бұрын

Thank you so much! Please show support to my video with Super thanks and don't forget to subscribe to my channel

@riaank.4585 Жыл бұрын

Thank you very much! I don't see yet, how you could switch OFF the P-MOSFET , i.e. how you could change the positive gate-voltage from VDD to 12V-MOSFET-supply...? Is an internal BIP-Transistor used for that inside the MOSFET-driver?

@luisfreire5724 2 жыл бұрын

gracias x el video y por los subtitulos en ingles ....ayuda mucho

@FoolishEngineer 2 жыл бұрын

¡Muchas gracias por mirar! Por favor no olvides suscribirte a nuestro canal

@priteshkchoughule5748 8 ай бұрын

Great information

@Patyx42 5 ай бұрын

Thank you so much!

@FoolishEngineer 4 ай бұрын

You're welcome!

@happyatheists9361 2 жыл бұрын

thanx...love from_Sri lanka

@FoolishEngineer 2 жыл бұрын

Thank you so much for watching!! Please don't forget to subscribe to our channel. Take care

@sabriahmed8203 Жыл бұрын

Nice job keep on.how can drive two mosfets N channel and p channel in same time with a sine wave with a high speed.

@LRoy-pp1uo Жыл бұрын

Hello, I like your videos, I want to learn that, what is the advantage of high-side drive over low-side drive, when is it better to choose high-side drive, and also what is the effect of them on the efficiency of the circuit(which has higher efficiency)?

@BoxingDayAC 4 ай бұрын

In reverse polarity protection, low-side has two problems that high-side does not. First problem is creating a voltage across the transistor's Rds on the ground itself. Second problem is separating the ground between the power source and circuit. In practice, this voltage is very small and probably within the acceptable noise level in most circuits. Splitting the ground should be fine in a battery-powered circuit but bad practice in a circuit powered from an outlet. High-side problem is just higher voltage loss from PMOS having higher Rds than NMOS. Thus PMOS is less efficient. Can use NMOS in high-side with a charge pump but that adds cost and complexity. One option for the charge pump meant for reverse polarity protection is the LM74610. Also, the zener + resistor aren't needed if you'll never exceed the MOSFET's Vgs limit, which is fair to say, never going to happen in a 3V battery circuit. Is a risk leaving them out in a circuit powered from the outlet due to voltage transients.

@arashcrouse2 5 ай бұрын

Thank you

@TheArmaanuiet 8 ай бұрын

Hi, i need help, to make a mosfet as switch, The source supply is 28 volts and load is 7 Ohm. Hence around 4 amps of current will flow. This entire circuit to be controlled by a 3.3 V control signal. Kindly suggest a logic level driver along with a mosfet.

@rayoflight62 2 жыл бұрын

You could have emphasized the comparison with a bipolar transistor. When the switch is connected with a common source configuration, the MOSFET works an an amplifier. When the MOSFET is connected in a common drain configuration, it acts as a voltage follower, with unity gain...

@ramagirikuna1586 Жыл бұрын

Hiii sir am currently working as design engineer..,Really your classes are worthble...❤

@FoolishEngineer Жыл бұрын

Great 👍

@RGDitchon Жыл бұрын

Romeo Jr. Thank you for the P Channel and N Channel relevant info Just ask about the resistor at the Gate how many ohms is it thanks

@FoolishEngineer Жыл бұрын

You can refer my other video to calculate the appropriate gate resistor value

@petername2608 2 жыл бұрын

Can you make 6 series MOSFET switching circuit using gdt

@tyronearendse1722 2 жыл бұрын

Hi friend thanks for another informative video

@FoolishEngineer 2 жыл бұрын

Thank you so much for watching!! Please don't forget to subscribe to our channel

@tyronearendse1722 2 жыл бұрын

@@FoolishEngineer I am a subscriber already, your explanations makes easier to understand, thanks again

@tomazis100 Жыл бұрын

Hi , so how can we switch a higher voltage like 60V with a N-channel fet ;

@Ed19601 Жыл бұрын

With a P-FET, switching on the FET is usually not a problem....just switch your driver pin LOW. However, switching it off may be a problem. Sure, if your driver pin is equal to the voltage on the Source, it will switch off, but most output pins of say a microcontroller, will not reach Vcc but stay slightly below it. If your MOSFET has a LOW Vgstreshhold tat might be enough to slightly open it. If one picks a MOSFET with a Higher VGS(th) that should not be a problem....but then say a 3V3 system may not be able to fully open the P-FET

@NOW-IS Жыл бұрын

Would defining an MCU output to an input with pull-up solve the issue of completely switch it off? I have a strange phenomenon on my circuit where I want to switch on external logic chip and off again. Sometimes it seems that the chip is not really in the same initial state and lost somewhere in nirvana and does not respond. I think it could be related to what you explain. So may this be a fix or do I still have a difference between gate and source?

@Ed19601 Жыл бұрын

@@NOW-IS interesting thought but in fact you are saying: let's try to get a higher voltage fed to the MCU pin. No real problem if the issue is that your mcu pin stays just below the rail voltage, but maybe not something that would work on a shared 3v3 / 5V system. Definitely worth a thought though

@kissmyaxe9121 5 ай бұрын

Could be easily solved by adding a pull up resistor of let's say 10k and connect it to vcc

@rameshwarshelke4633 2 жыл бұрын

Thank you sir .

@FoolishEngineer 2 жыл бұрын

Thank you so much for watching!! Please don't forget to subscribe to our channel

@errayyanar 7 ай бұрын

In motor driver circuits, we use N-channel MOSFET as Low & High side MOSFET, Why we are not using P-Channel as high side MOSFET in that case ? I suspect reason is, 1. Rds(on) high in P-Channel 2. To turn on & turn off high side MOSFET at same speed as Low side MOSFET to have synchronisation in on & off ? Any other reason or wrong assumption? Kindly reply.

@HemendraSinghChouhan-po2pp Жыл бұрын

Sir for irf840 N channel MOSFET can we use ir2113

@prashantmirjapur4772 4 ай бұрын

is there additional driver circuit in buck converter as they use nmos high side switching ? If yes then why they don't use pmos instead that complex circuit

@edisont.picard4112 3 ай бұрын

Usually a charge pump gate drive is used to switch the nmos. The reason why is that pmos is more expensive than nmos and it is much less .efficient. The Rdson of nmos is much lower than pmos, therefore less energy will be lost as heat during switching. This is important in portable battery powered applications.

@mery.m 3 ай бұрын

at 2:29 Is the Vdd power connected to the 12 Volt battery and if so why is it allowed. isnt it a short circuit? I`d be glad for any answer

@edisont.picard4112 3 ай бұрын

Why would it be a short? Vdd is the driver positive power supply input. It doesn't have to be the same supply as the load, but it usually is.

@flashuma Жыл бұрын

Thanks

@FoolishEngineer Жыл бұрын

Thank you so much for your super thanks!!

@jugaatbaat8891 Жыл бұрын

Can this circuit also be used for IGBT's ? do help me out please.

@FoolishEngineer Жыл бұрын

Yes

@TheSlagor Жыл бұрын

I did not understand + 7volt. or - 7volt. on the gate of p-mosfet ?

@TheArmaanuiet 8 ай бұрын

+7 volt, as voltage at gate minus voltage of source would be -5 voltage, negative allowable vgs will turn on the mosfet

@koldenrjk Жыл бұрын

P channels @ over 60 amps are becomming scarce - I need to switch to n channel perhaps.

@jameswyatt1304 Жыл бұрын

As you scale up, the P-channel refers to "parallel", LOL. Spreading the load between multiple FETs also allows better spread across a heatsink.

@Dc_tech386 9 ай бұрын

That’s why I see 129volt on the gate of the mosfets on my fully bridge driver because the gate and the switching voltage have to be almost the same to fully switch high side on that’s one information never mention in any mosfet data sheet so why is this information hidden from the user on the product

@kaiserschnitselsr.9228 Жыл бұрын

voeltaasshh?

@kimienick6721 2 жыл бұрын

Lol I always confuse with spelling OMPH cause to much see words UPM lol 🤣🤣🤣🤣🤣... 16V using for push your starter more powerful and food for music sound effects... BTW sorry for saying this lol it's old school skill now we have APP electric system

@jenkinssthomson8879 Жыл бұрын

Poor choice in using 7 v bc it’s not a realistic or practical real world example

@josepeixoto3384 Жыл бұрын

that is why i wonder how some youtubers are really good common world techs

@NICKLASFARFAR 10 ай бұрын

It makes perfect sense as it illustrates the maximum voltage that would turn on the P-fet. He even mentions grounding it afterwards as the realistic use case, thus connecting it to 0 volts and getting -12v VGS instead of the -5V VGS he got when he mentioned a 7V connection at the gate pin.

@herobrine1847 Ай бұрын

Here the engineer goes on again about “real world examples” 😏