Thank you Dr. K! I am diagnosing a circuit board with a DC motor controller. The MOSFET gate is driven with a totem pole circuit. Your video was super easy to understand and provided me with confidence to troubleshoot this controller.
Very great professor. Thanks for sharing this knowledge. This kind of on demand stream education is accelerating and optimizing our society work power. Cheers.
Adam, you are welcome for the content and are correct. The audio in this video is awful. I need to recut this one with better graphics and will clean up the audio. I think there's value in this as there's not much on the totem driver circuit out on RUclips. Thank you for watching and thank you for the feedback. Best wishes. -Dr. K
I can buy a digital temperature sensor with digital display, but in a classic 53 year old GM truck. It and the EFI engine fell into my hands for free. My son gave up on the old truck, then hit a tree off black ice in a 2003 Tahoe. That engine is going to make my daily driver more reliable. My task is cooling the transmission, using a NTC thermistor in a voltage divider circuit with a potentiometer to drive a N-Type mosfet. I have not measured the amps the fan pulls but would guess it’s 24-30. I wanted to use a matched relay to make a simple but robust circuit. A relay makes future diagnostics easy, as I have room next to others. One gentleman said I would have hysteresis in the relay. Your video was the first time I have heard of a driver for the mosfet. The store bought on loosed it’s memory if power is lost. Hate to ask, but do you have any thoughts? I have 3 parts bins of electrical components my grandpa owned. He was an electrical engineer and ran field generators for a new thing called “Radar” in WW-II. I lost him the year before I married, 40 years back. Thanks for the videos that allow enthusiasts like me, to learn!
Hi Dean, you could probably use a DC relay to drive the MOSFET. Watch your Vgs limits as you do not want to exceed the max values on the data sheets. Thanks for watching. -Dr. K
Excellent point Jono. As a designer, you have to always account for the the logic polarities on the interface between your control and drive circuits. Thanks for watching.
Hi Pre, the gate to drain capacitance charging and discharging is impacted by the Miller Effect. Here's a good application note www.vishay.com/docs/73217/an608a.pdf. Also, please reference my video on MOSFET switching ruclips.net/video/RViwOc4g-gw/видео.html. Thank you for asking. -Dr. K
You are right. I do need to re-edit that video. It is one of the more popular ones and the audio terrible. My summer project. Thank you for the feedback. -Dr. K
I want to drive my igbt at 15 volt but the Ic can push the current but I get 15 volt on the output at 250 milliamperes but I need 5 amp at 15 voltage to draw the 5000 watt inverter I design with igbt so can the totem pole base receive the 15 volt with 2k resistor will the base break down at the higher volt of the totem will work
Great question which applies to high-side driving of typically a P-channel MOSFET. The answer is yes. However, the switching frequency range is relatively broad and will partially determine the value of boot-strap capacitor used. As an example, it is impossible to never switch because the boot-strap capacitor requires charge and this capacitor charges up when one side is switched to ground either through the driver or through the low-side switch. Once charged, the boost-capacitor can then be used to drive the MOSFET and acts like a floating voltage supply. However, the capacitor will eventually discharge over time and the result is Vgs will slowly decrease to an in operable point. If the switching frequency is to high, the boot-strap capacitor never fully charges up or takes too long to charge. Often the high-side gate drive datasheet will provide information on selecting the boot-strap capacitor based on your switching frequency. Best wishes on your design. -Dr. K
@@powerelectronicswithdr.k1017 thanks for perfect explanation. one more question about gate drive. Gate drive require high current for a moment ,(say 500 mA), due to Cgs. If we use bootstrap, does bootstrap capacitor can deliver such a high current?
Excuse me 1.the totem pole use Mosfet how it work I know use the BJT the current could be larger but the mosfet can do the same thing? 2.what's benefit BJT connect the mosfet is the loss can reduced?
Yes, you can use MOSFET technology in a totem configuration. Often integrated drive circuits use MOSFETs or a combination of MOSFETs and BJTs. If you build your own drive circuit using discrete devices, I would recommend BJTs. Yes, the losses are a concern for the totem circuit, but usually are small compared to the power switch. Thanks for watching and best wishes on your designs. -Dr. K
@@powerelectronicswithdr.k1017 sir I still have question how to drive the mosfet totem pole, it is the same with BJT? BJT can do the emitter follower mosfet can do?
@@rj8528 It depends on what you are using the totem circuit topology for. Is this for a push-pull voltage follower amplifier? If so, the n-channel MOSFET is on top and the p-channel is on the bottom of the totem. If you are using MOSFETS in a totem configuration as a gate driver, then I strongly suggest you implement using an integrated circuit and do not try to build a discrete driver circuit. Here's an example of a gate driver IC that uses a MOSFET totem circuit topology www.analog.com/media/en/technical-documentation/data-sheets/44411fa.pdf. You can see on page 8, that N1 and P1 make up the main drive circuit. Best wishes. -Dr. K
Hi Anjo, the base resistor is calculated in a similar manner to calculating a current limiting resistor for an LED. The base-emitter is a pn junction in a BJT and behaves like a diode. Use the data sheets to determine the collector-emitter saturation current and the minimum value of beta for the device. Use these values to compute the minimum value of base current required for saturation, so I_base = Ice_sat/beta. Assume a 0.65V for the base-emitter junction and let Vs equal your control voltage applied to the totem-circuit. Rb = (Vs-0.65)/I_base. You can use the next standard resistor size smaller than your calculation. Hope this helps. -Dr. K
Hi Gonzalo, that's not an easy answer as it depends. The power consumption will primarily be switching-based and very dependent on the IC gate driver you select. If you are using a gate driver IC, then I would look at the data sheets. Best wishes on your design. -RWK
You’re competing with your music in beginning, tone it down a bit. The audio also cuts in and out when you’re going over some of the logic and data sheets.
Hi Dmitriy, thanks for the feed back. I may go back and re-edit this video if time permits. The operation of totem pole circuit is good to know for analyzing a gate driver and there isn't much on RUclips covering this circuit. Thank you for watching and helping me improve the user experience.
Qu'est-ce que c'est que ce tintamarre d'enfer en introduction particulièrement pénible et lequel couvre votre voix ? Déjà qu'il n'est pas simple d'entendre vos paroles et de vous comprendre, il y aurait intérêt à supprimer ce bordel ambiant, parfaitement inutile et désagréable. Merci !
Hi James, profanity is not allowed in the replies. I know the audio is poor. I've kept it up because there is still some value to the content (even with poor audio). These videos were done for course I was teaching during the initial pandemic closures in March 2020 and was publishing this at a very quick pace. This was one I meant to re-edit with improved audio. Thanks for watching and please clean up your post or it will be removed. - Dr. K
Very clear explanations. I came for the BJT Totem pole driver part and think I understood all (I'm a beginner). Thank you very much, sir !
The world's best teacher
Kabanda, thank you for the kind words. -Dr. K
Thank you Dr. K! I am diagnosing a circuit board with a DC motor controller. The MOSFET gate is driven with a totem pole circuit. Your video was super easy to understand and provided me with confidence to troubleshoot this controller.
Anthony, you are welcome and glad the video was helpful. Keep me updated on your troubleshooting. -Dr. K.
Very great professor. Thanks for sharing this knowledge. This kind of on demand stream education is accelerating and optimizing our society work power.
Cheers.
Thank you for the kind words. Best wishes on our designs. -Dr. K
Good video, but it was kind of frustrating that the audio kept cutting out at the end of the video. Thank you for the great content!
Adam, you are welcome for the content and are correct. The audio in this video is awful. I need to recut this one with better graphics and will clean up the audio. I think there's value in this as there's not much on the totem driver circuit out on RUclips. Thank you for watching and thank you for the feedback. Best wishes. -Dr. K
Good Job. Best regards from Brasil.
Thank you Leanardo. Best wishes on your designs. -Dr. K
I can buy a digital temperature sensor with digital display, but in a classic 53 year old GM truck. It and the EFI engine fell into my hands for free. My son gave up on the old truck, then hit a tree off black ice in a 2003 Tahoe. That engine is going to make my daily driver more reliable.
My task is cooling the transmission, using a NTC thermistor in a voltage divider circuit with a potentiometer to drive a N-Type mosfet. I have not measured the amps the fan pulls but would guess it’s 24-30. I wanted to use a matched relay to make a simple but robust circuit. A relay makes future diagnostics easy, as I have room next to others.
One gentleman said I would have hysteresis in the relay. Your video was the first time I have heard of a driver for the mosfet. The store bought on loosed it’s memory if power is lost. Hate to ask, but do you have any thoughts? I have 3 parts bins of electrical components my grandpa owned. He was an electrical engineer and ran field generators for a new thing called “Radar” in WW-II. I lost him the year before I married, 40 years back.
Thanks for the videos that allow enthusiasts like me, to learn!
Hi Dean, you could probably use a DC relay to drive the MOSFET. Watch your Vgs limits as you do not want to exceed the max values on the data sheets. Thanks for watching. -Dr. K
Simply excellent! Those totem pole drivers are used in inverters. My humble thanks Dr. 👍
Thank you. Dr. K
sir, you are a real genius..thanks..its been long i heard the word totempole..made search on drivers a little bit easier..thanks sir
You are welcome. Hope it helped with your design.
your explanations are very clear and helpful, thank you
god bless you!
You're welcome. Hoping the information was helpful. Best wishes with your designs. -Dr. K.
Except for the part where the volume kept coming in and out 🙁
It's also worth noting that MOSFET totem-pole inverts the signal!
Excellent point Jono. As a designer, you have to always account for the the logic polarities on the interface between your control and drive circuits. Thanks for watching.
Excellent!
Prof. could you please make a step by step video on a SiC MOSFET. Please!!!
For diy, a soic (1.27mm pitch) would not need a stencil, and they make one: NCP5901BDR2G
how ever the sound wasn't great, but we're engineer and... We got it(we use estimator and kallman filter :D ). thanks!
LOL. Thank you. I'll be fixing the sound on this video in a couple of months. I'm surprised that it is one of the most watched on my channel.
Thank you
Wow, it was awesome, congratulations... May I learn Which accent you speak?
Hi Necip, sometimes I will slip into a Milwaukee dialect. This dialect stems from the German and Polish heritage of Milwaukee :) -Dr. K
Thank you Dr K for the video. Could you please clarify if you meant "gate to source capacitance" at 12:46?
Hi Pre, the gate to drain capacitance charging and discharging is impacted by the Miller Effect. Here's a good application note www.vishay.com/docs/73217/an608a.pdf. Also, please reference my video on MOSFET switching ruclips.net/video/RViwOc4g-gw/видео.html. Thank you for asking. -Dr. K
Thanks 😊👍🙏💯
This vidio is so valuable. Please edit and make this better(interupt audio). Thanks bytheway.
You are right. I do need to re-edit that video. It is one of the more popular ones and the audio terrible. My summer project. Thank you for the feedback. -Dr. K
I want to drive my igbt at 15 volt but the Ic can push the current but I get 15 volt on the output at 250 milliamperes but I need 5 amp at 15 voltage to draw the 5000 watt inverter I design with igbt so can the totem pole base receive the 15 volt with 2k resistor will the base break down at the higher volt of the totem will work
You might want to search for a driver or will need to design your own totem circuit. I would look for a driver for IGBTs first.
Does bootstrapping limits switching frequency ?
Great question which applies to high-side driving of typically a P-channel MOSFET. The answer is yes. However, the switching frequency range is relatively broad and will partially determine the value of boot-strap capacitor used. As an example, it is impossible to never switch because the boot-strap capacitor requires charge and this capacitor charges up when one side is switched to ground either through the driver or through the low-side switch. Once charged, the boost-capacitor can then be used to drive the MOSFET and acts like a floating voltage supply. However, the capacitor will eventually discharge over time and the result is Vgs will slowly decrease to an in operable point. If the switching frequency is to high, the boot-strap capacitor never fully charges up or takes too long to charge. Often the high-side gate drive datasheet will provide information on selecting the boot-strap capacitor based on your switching frequency. Best wishes on your design. -Dr. K
@@powerelectronicswithdr.k1017 thanks for perfect explanation.
one more question about gate drive.
Gate drive require high current for a moment ,(say 500 mA), due to Cgs. If we use bootstrap, does bootstrap capacitor can deliver such a high current?
Audio a bit choppy sometimes but I think I got everything.
Excuse me
1.the totem pole use Mosfet how it work I know use the BJT the current could be larger but the mosfet can do the same thing?
2.what's benefit BJT connect the mosfet is the loss can reduced?
Yes, you can use MOSFET technology in a totem configuration. Often integrated drive circuits use MOSFETs or a combination of MOSFETs and BJTs. If you build your own drive circuit using discrete devices, I would recommend BJTs. Yes, the losses are a concern for the totem circuit, but usually are small compared to the power switch. Thanks for watching and best wishes on your designs. -Dr. K
@@powerelectronicswithdr.k1017
sir I still have question
how to drive the mosfet totem pole, it is the same with BJT?
BJT can do the emitter follower mosfet can do?
@@rj8528 It depends on what you are using the totem circuit topology for. Is this for a push-pull voltage follower amplifier? If so, the n-channel MOSFET is on top and the p-channel is on the bottom of the totem. If you are using MOSFETS in a totem configuration as a gate driver, then I strongly suggest you implement using an integrated circuit and do not try to build a discrete driver circuit. Here's an example of a gate driver IC that uses a MOSFET totem circuit topology www.analog.com/media/en/technical-documentation/data-sheets/44411fa.pdf. You can see on page 8, that N1 and P1 make up the main drive circuit. Best wishes. -Dr. K
@@powerelectronicswithdr.k1017 I Thanks
Can you teach us next how to calculate the resistor used for base totompole. Also for switching MOSFET gate resistor
Hi Anjo, the base resistor is calculated in a similar manner to calculating a current limiting resistor for an LED. The base-emitter is a pn junction in a BJT and behaves like a diode. Use the data sheets to determine the collector-emitter saturation current and the minimum value of beta for the device. Use these values to compute the minimum value of base current required for saturation, so I_base = Ice_sat/beta. Assume a 0.65V for the base-emitter junction and let Vs equal your control voltage applied to the totem-circuit. Rb = (Vs-0.65)/I_base. You can use the next standard resistor size smaller than your calculation. Hope this helps. -Dr. K
@@powerelectronicswithdr.k1017 very nice sir. Thank you sir. Waiting for MOSFET gate resistor calculation for high speed application.
How can I simulate DRF1400 circuit if anyone have idea please share with me that will be highly appreciable thanks
how could I get the power consumption of a gate driver?
Hi Gonzalo, that's not an easy answer as it depends. The power consumption will primarily be switching-based and very dependent on the IC gate driver you select. If you are using a gate driver IC, then I would look at the data sheets. Best wishes on your design. -RWK
I want to usé a tótem pole to drive my mofets on my tesla coil this help a lot
Glad it was helpful. Best wishes on that Tesla coil. -Dr. K
You're obviously not a sound-editing "Dr". 😁
Lol. One day I'll re-mix this video :) Thank you for watching Edin. -Dr. K
You’re competing with your music in beginning, tone it down a bit. The audio also cuts in and out when you’re going over some of the logic and data sheets.
Hi Dmitriy, thanks for the feed back. I may go back and re-edit this video if time permits. The operation of totem pole circuit is good to know for analyzing a gate driver and there isn't much on RUclips covering this circuit. Thank you for watching and helping me improve the user experience.
I ain't looking for somewhere to sit
Qu'est-ce que c'est que ce tintamarre d'enfer en introduction particulièrement pénible et lequel couvre votre voix ? Déjà qu'il n'est pas simple d'entendre vos paroles et de vous comprendre, il y aurait intérêt à supprimer ce bordel ambiant, parfaitement inutile et désagréable. Merci !
What's wrong with the audio? The main shot is muted at overly annoying times.
Hi James, profanity is not allowed in the replies. I know the audio is poor. I've kept it up because there is still some value to the content (even with poor audio). These videos were done for course I was teaching during the initial pandemic closures in March 2020 and was publishing this at a very quick pace. This was one I meant to re-edit with improved audio. Thanks for watching and please clean up your post or it will be removed. - Dr. K
@@powerelectronicswithdr.k1017 thanks for the great videos they're awesome, I've been learning a lot from you. But I didn't see profanity .
My mistake, James. I misread "shot." Thanks for watching and sorry about the lousy audio in this one. Best wishes on your designs. -Dr. K