8-100V to 5V-1A DC to DC Buck Converter using MP9486
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- Опубликовано: 26 авг 2024
- 8V to100V to 5V 1A DC to DC Buck Converter using MP9486
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Altium Designer + Legal License (Free): www.altium.com...
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Altium 365: www.altium.com...
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OctoPart: octopart.com
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Article: www.pcbway.com...
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Gerber/PCB Order: www.pcbway.com...
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Other Videos: bit.ly/2N9OlPa
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DC-to-DC buck converters are utilized ubiquitously in electronic devices. Three major types of non-isolated DC-to-DC converters are introduced: Buck, Boost, and Buck-Boost. The most frequently employed type is the Buck converter. In this article/video, I introduce a compact buck converter board, capable of accepting input voltages ranging from 8V to 95V and handling 5V-1A at the output.
The selected controlling chip is the MP9486. It is a high-frequency and somewhat sensitive controller chip as some users reported encountering instability issues. However, I have applied a few modifications to the circuit and as a result, you can utilize this circuit, PCB, or assembled board without any issues. The circuit offers consistent regulation within the defined input voltage range, effectively managing the maximum output current.
For the schematic and PCB design, I utilized Altium Designer 23. I shared the project with my colleague for feedback and edits through Altium 365's secure cloud space. The Octopart component search engine proved invaluable for obtaining component information and generating the Bill of Materials (BOM). To ensure the production of high-quality fabricated boards, I forwarded the Gerber files to PCBWay.
I tested the circuit's performance for a range of input voltage, output current, stability, and output noise. This comprehensive testing was conducted using the Siglent SDL1020X-E DC Load, the SDM3045M multimeter, and the SDS2102X Plus oscilloscope.
I am confident that this circuit fulfills your requirements for a compact high-voltage buck converter board.
DC to DC Buck Converter using MP9486
Cool for automotive application 🚘
Yes, it meets the requirements
Hi, I'm designing one for 4.2V and 12.0V, I've managed to get the output voltage with R4=10K, R3=590K (for 12V) and R3=200K (for 4.2V).
As per the datasheet's application note, the inductors are 33uH for 5V and 47uH for 12V output, so I put the same with 1.5A rating (going to replace with larger current ratings favoring lower DCR)
The 4.2V application needs at least 600uF at the output for handling the voltage dips due to current spikes (1.6A bursts for ~600usec every 4msec), so I've put 2 units of 330uF 6.3V.
The 12V application works with 100uF, but I will put 470uF 16V for output voltage stability.
The input capacitors are the same as datasheet, i.e. 2 units of 2.2uF.
Now for these two applications, what should the values of R2, C5, C7? from reading the earlier comments, I looks like there's a linear relationship between R2 and the output voltage, therefore, for 4.2V the R2 should be ~400Ohm and for 12V the R2 should be 1.1KOhm ????
If that's correct then these resistors are not readily available, can I use 470Ohm and 1.2K ?
C5 and C7 are identical for whatever output voltage. if finding the right resistors is difficult, you can use a potentiometer, otherwise, the Vout formula is within the datasheet. Choose the value of R2 in a way to draw at least 10-15mA. value is not critical however pay attention to the power dissipation on the resistor.
@@MyVanitar I'm curious to know why R2 is required? It was not suggested in the datasheet of this device!
Have you watched the video completely? many people have a problem with this chip and wrote posts on the manufacturer's forum. this circuit was the only possibility that it worked for me flawlessly.
How to make 12v?? I want 50 v until 70v input, out 12v, load mybe 0,5A or less only for input IC
Just order the PCB directly, because circuit is identical. You only need to change the values of R1, R3, R4 and C6 (C6 for 16V, maybe 100uF-16V has the same footprint).
if you want this assembled, just let me know to make a new BOM and you can place your order
@@MyVanitar no i want combine with my circuit, but i dont know how to get 12v, i see the data sheet also i dont get it
I suggest you not to combine it and mount this board on your main PCB instead, it is clear that you have not watched the video completely.
@@MyVanitar yess i just want to get the output 12v, wich value resistor should i used?
another cute project. It can be complex although it looks simple 😢
Thank you! 😊
Thanks for all the info on this circuit! I see the BOM lists C2 and C3 as 10uF but on the schematic they're labeled 22uF. Any clarification on this? Thanks!
Thanks. if you could find 22uF capacitors with that voltage and package size, use 22uF, otherwise most of the capacitors in the market for that voltage and size are not higher than 10uF
Gotcha! Im trying to stick to through hole components so maybe I will try for two 10uFs in parallel for good measure. Space isn't much of an issue in my case@@MyVanitar
the input side is not as sensitive as the output. the layout is very important
Thank you
You're welcome
what values do we need to change to achieve 24 V, a comparison example would have been great
Just order the PCB directly, because the circuit is identical. You only need to change the values of R1, R3, R4, and C6 (C6 for 35V, maybe 47uF-35V has the same footprint). Check this yourself
also the R2 should be 2.2K for 24V output
Nice video 🙏
Thanks for the visit
Can i input ac main 230 v
No, maximum 90V-DC
@@MyVanitar any buck converter support 200 v dc?
I can design it for you as a premium project. also, I have some designs that can get 230V mains input on the channel, but the output is fixed