Is this the BEST Voltage Converter? Trying to build a Synchronous Converter!



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Previous video: https://youtu.be/KE3CjZ0BUFo
MOSFET Driver video: https://youtu.be/8swJ_Bnsgl4

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Parts list (affiliate links):
IR2184 MOSFET driver: https://s.click.aliexpress.com/e/_AnpUcr
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SS34 Diode: https://s.click.aliexpress.com/e/_Ac5TCb
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IRFB3077 MOSFET: https://s.click.aliexpress.com/e/_AL7HWB
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100uH Inductor: https://s.click.aliexpress.com/e/_Aq42ab
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470uF Capacitor: https://s.click.aliexpress.com/e/_AFCjAJ
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PCB Terminal: https://s.click.aliexpress.com/e/_A8H315
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In this video I will be showing you how I created a synchronous buck converter. Such a synchronous design comes with one big advantage and that is a better efficiency. Datasheets claim an efficiency of 95% and above which I wanted to confirm by myself. That is why I will not only show you how a normal buck converter functions, but also how to transform it into a synchronous buck converter. Let’s get started!

Useful websites which were shown/mentioned in the video:
https://www.we-online.com/web/en/index.php/show/media/07_electronic_components/news_1/blog/midcom_blog_photos/SMPSChart.pdf
https://www.ti.com/seclit/ug/slyu036/slyu036.pdf
https://www.maximintegrated.com/en/design/technical-documents/app-notes/6/6129.html
https://techweb.rohm.com/knowledge/acdc/acdc_pwm/acdc_pwm04/3551
https://www.monolithicpower.com/en/the-difference-between-ccm-and-dcm-explained
https://www.ieee.li/pdf/viewgraphs/topology_review_dc_dc_converters.pdf
https://www.ti.com/lit/ds/symlink/lmq61460-q1.pdf?ts=1634034318661&ref_url=https%253A%252F%252Fwww.ti.com%252Fpower-management%252Fnon-isolated-dc-dc-switching-regulators%252Fstep-down-buck%252Fbuck-converter-integrated-switch%252Foverview.html%253Fgclid%253DEAIaIQobChMIv4Xm99PE8wIVAeztCh3vQAOeEAAYASAAEgIDtfD_BwE%2526gclsrc%253Daw.ds
https://www.ti.com/lit/an/snva038b/snva038b.pdf
https://fscdn.rohm.com/en/products/databook/datasheet/ic/power/switching_regulator/bd93291efj-e.pdf
https://www.ti.com/lit/ds/symlink/lm61495.pdf?ts=1634225117018&ref_url=https%253A%252F%252Fwww.ti.com%252Fpower-management%252Fnon-isolated-dc-dc-switching-regulators%252Fstep-down-buck%252Fbuck-converter-integrated-switch%252Foverview.html

Thanks to JLCPCB for sponsoring this video.
Visit https://jlcpcb.com to get professional PCBs for low prices.

Music:
2011 Lookalike by Bartlebeats

0:00 Why a “Synchronous” Voltage Converter?
1:15 Intro
1:54 Buck Converter Theory
4:09 DIY Buck Converter
5:25 Improving The Buck Converter (Synchronous Design Theory)
6:59 DIY Synchronous Buck Converter
8:16 DCM Problem with the Synchronous Design
9:40 Power/Efficiency Tests

source

35 thoughts on “Is this the BEST Voltage Converter? Trying to build a Synchronous Converter!

  • October 31, 2021 at 4:52 pm
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    Those efficiency guidelines are just guidelines. DCM Flyback converter for instance can easily be used for power levels greater than 100W (I have a 130W Dell charger for instance, I would not be surprised to learn if my 200W HP charger is also a Flyback converter) and can achieve high efficiency as well, total conversion efficiency of 88% is required.

    Forward converters are also commonly used on medium power ATX power supplies, even good ones with 80+ ratings. (I would classify the 0.44 drawings for forward, push-pull, and and half bridge all as types of forward converter, being defined mostly by the secondary LC stage.)

    LLC Converters are used where you need really high power! ATX Computer Power Supplies that are over 800W are going to be of the resonant topology.

    Reply
  • October 31, 2021 at 4:52 pm
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    Ya just took electronics in bifocal in 11th and your videos help me in the electronics

    Reply
  • October 31, 2021 at 4:52 pm
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    Hey Scott, great video!
    Have you seen the Voltera V1 ads on YouTube? It's this small little PCB making machine that can sit am your desk. Is it possible for you to test it?

    Reply
  • October 31, 2021 at 4:52 pm
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    4:01 mistake. NPN mosfet cannot work on the high-side since it will turn itself off.

    Reply
  • October 31, 2021 at 4:52 pm
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    that's why I am follow @great scoot much much informational video LOVE FORM INDIA

    Reply
  • October 31, 2021 at 4:52 pm
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    I was curious what you'd use to drive a low power higher voltage thingy. Like a piezo buzzer with a 3-30V range off an Arduino. (Voltage is more noise, right :P)

    Reply
  • October 31, 2021 at 4:52 pm
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    How to increase the efficiency of most circuits 101:
    Replace bipolar transistor with a FET and some complicated logic that emulates the bipolar.

    Reply
  • October 31, 2021 at 4:52 pm
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    Great work eh! Very easy to understand video. A couple questions – Is that a programmable load for testing that you were using (the thing with the heatsink and fan)? If so where would I order one? Such a handy tool to have.

    Reply
  • October 31, 2021 at 4:52 pm
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    What ever happened with that issue from the company in China that stole your project? Were you able to get a happy ending?

    Reply
  • October 31, 2021 at 4:52 pm
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    I think these converters are used in motherboards to powering cpu's. Great tutorial as always thanks Great Scott

    Reply
  • October 31, 2021 at 4:52 pm
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    If only JLC had a matt green solder mask it would be my number one shop….

    Reply
  • October 31, 2021 at 4:52 pm
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    I want to know how to make PCBs using the company in your advertisement, can I send them circuit diagrams?

    Reply
  • October 31, 2021 at 4:52 pm
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    Sounds like How your GPUs/VGAs' Chipset and VRAM module voltage are supplied. A mosfet driver, Low and High Side Mosfets, A Capacitor, and an inductor/Coil. Interesting!

    Reply
  • October 31, 2021 at 4:52 pm
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    Sometimes, the AC resistance of the inductor can be a tricky bit, as, at short duty cycles, the apparent frequency content of the inductor current can be high enough to cause several % loss. And, of course, PCB layout can affect performance due to parasitics that reduce switching performance ….and so on, as I'm almost sicher that you know. Nice video. BTW, the ripple frequency and amplitude when in DCM, lets you do some calculations of parasitic capacitance and ACR. "Left as a proof by the student" 😉

    Reply
  • October 31, 2021 at 4:52 pm
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    can u make a 12v lead acid battery charger using old pc power supply unit….. there is many videos on YouTube but no one shows does it safe..

    Reply

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