LDO Regulator Hardware Design

LDO Regulator Hardware Design - Phil's Lab

Рет қаралды 38,794

Күн бұрын

How low-dropout (LDO) regulators work, when they should(n't) be used, LDO datasheets, key parameters to choose, power dissipation and thermals, and PCB layout/routing demo. PCBs by PCBWay www.pcbway.com
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[TIMESTAMPS]
00:00 Introduction & Basics
01:57 Altium Designer Free Trial
02:35 PCBWay
03:04 Reasons for Using LDOs
04:19 How LDOs Work
09:31 Power Dissipation Calculation
10:58 Datasheet & Key Parameters
15:05 Input/Output Capacitors and Derating
17:01 Cascading Switching and LDO Regulators
18:15 Example Design
19:34 Layout & Routing
25:47 Outro

Пікірлер: 74

@tsraikage Ай бұрын

this channel is the goldmine for novice electrical engineers. Thank you so much.

@dhruvbose8294 Жыл бұрын

Thank you thank you thank you! Cannot thank you enough for teaching all of us and helping us build foundations in electronics and PCB design!

@PhilsLab Жыл бұрын

My pleasure - thank you very much for watching!

@user-ww2lc1yo9c Жыл бұрын

@@PhilsLab I am having some trouble with a topic. Eveywhere I see the concept of characteristic impedance and PCB tracks is covered in detail. But how to match via impedance with track impedance and how to ensure that via does not cause SI problems in high speed signals is not covered in detail anywhere. What do I do?

@user-pn9be1zt7n Жыл бұрын

@@user-ww2lc1yo9c About via effect to transmission line (SI problem you mentioned), probably there're just few methods to minimize your concerns. 1. Put extra vias connected to your return path (may be a soild ground plane or a specific power plane. Depend on your chip driver design) near the vias of your signal transition. 2. From the PCB design, can try back drill or HDI design to minimize the drop of impedance caused by via Via isn't always critical. It depends on rise time need of your digital signals running on the PCB. If the rise time isn't too short and longer enough in your design, I think a little bit impedance drop caused by via should be acceptable. Hopefully, this info is helpful to you.😁

@user-pn9be1zt7n Жыл бұрын

Great video. It's the first time I see someone explain this topic with block diagram. Clear enough.

@teddyjamilonatefreire8797 Жыл бұрын

What a good explanation, Phil! I love learning with all your teachings and advices.

@PhilsLab Жыл бұрын

Thank you, Teddy!

@TYGAMatt 5 ай бұрын

Phil you're a star! I love your vids but quite often struggle to keep up as I'm just a hobbyist. This vid was just what I was looking for. Clearly explained and has set me on the correct path for the regulation I need. Cheers! Matt

@sc0or Жыл бұрын

What I like the most in these videos, is that I get knew interesting IC models every time. For instance, it was good to find out a better alternative to lm317, with a lower output noise at the same price.

@PhilsLab Жыл бұрын

Glad to hear that the vids are useful in that way as well, thanks!

@imagiro1 Жыл бұрын

Couldn't agree more. And actually it would be great if Phil could post a video with suggestions for some standard parts, which are easy to use, reliable and of course cheap at pcbways and / or jlcpcb. Finding parts takes such a lot of time, and without experience you often don't have the slightest idea what to look for.

@augustinwaga4948 Жыл бұрын

Thank you very much for all you do for us Mr Philips

@PhilsLab Жыл бұрын

Thank you for watching, Augustin :)

@horiarizea8258 Жыл бұрын

This is an EXCELLENT video - well done. Subscribed!

@PhilsLab Жыл бұрын

Thank you!

@arp_catchall Жыл бұрын

Thanks Phil for another great presentation.

@PhilsLab Жыл бұрын

Thank you for watching!

@Ashishkumar-gz3ww Жыл бұрын

Thank you for sharing you knowledge 🙏

@bikothewolf Жыл бұрын

Great video as always!

@PhilsLab Жыл бұрын

Thank you, Biko!

@TimPerfetto Жыл бұрын

Thank you! One thing I keep hoping for is to see you build a logic analyzer maybe just the front end if that is easier

@ahou3236 Жыл бұрын

I was looking for a video from you about this topic like 10 hours ago and you uploaded one right after 😂

@PhilsLab Жыл бұрын

Yay, glad to hear that :)

@stompreaper Жыл бұрын

Really good video, thanks!

@PhilsLab Жыл бұрын

Thank you, Stephen!

@user-kr8tp3ko8z Жыл бұрын

Nice tutorial 👍

@PhilsLab Жыл бұрын

Thank you!

@deangreenhough3479 Жыл бұрын

Great work Phil, always worth the time to watch. When's your FPGA course due to be released? I am eagerly awaiting it 🙂

@PhilsLab Жыл бұрын

Thank you, Dean! Within the next 1-2 weeks. I've uploaded more than half the content already. Will make a video once it's released!

@AbbasA-gg1fp Жыл бұрын

Thank you very much

@Debraj1978 Жыл бұрын

Usual linear regulator --> uses darlington transistor, which drops more voltage across itself (Darlington has higher Vce drop), but needs less base current drive. LDO --> Uses 1 transistor (PNP), which drops less voltage across itself, but needs more current to drive the base. This current is not seen in the output, but is used by LDO to operate itself.

@matheokoning4456 Жыл бұрын

Normally I find your videos too complex for me but this one was perfect!!

@PhilsLab Жыл бұрын

Glad to hear this one was just right! Any other topics you'd be interested in?

@matheokoning4456 Жыл бұрын

@@PhilsLab I find all your videos interesting to watch. You explain it well. There are plenty of interesting topics. For example, I'm trying to copy the fs1000a module myself to use in my own pcb, but I don't understand it yet. There is also little information about a 433mhz pcb antenna. I am also curious what determines the efficiency of a boost converter and how you can possibly improve it. I am also curious about programming the cheaper microcontrollers such as the padouk or ch32v003 microcontrollers. But like I said. Find all your videos very interesting to watch! So keep it up!!

@matheokoning4456 Жыл бұрын

@@PhilsLab But what might suit your videos more.... Maybe you could make a video explaining how to properly read a schematic off a datasheet. As an example the IP5306 (power bank) ic. In the schematic you see different input and output capacitors. What are they for and how do you know which capacitor should be placed close to the IC. Perhaps you can share some general tips with us to read a schematic properly and translate it into a pcb.

@PhilsLab Жыл бұрын

Those are great ideas, thank you! 'How to read a datasheet' is something I actually wanted to record in the very-near future.

@matheokoning4456 Жыл бұрын

@@PhilsLab That is amazing. I eagerly await that video!!

@temyraverdana6421 Жыл бұрын

Great lesson! thanks a lot

@PhilsLab Жыл бұрын

Thanks!

@andrewFJ 5 ай бұрын

It would be bice to know also how you arrangeg ground around and near the LDO and see traces that carry voltage to components.

@PhilipStubbs Жыл бұрын

Much appreciated. Thank you.

@PhilsLab Жыл бұрын

Thanks for watching!

@technical5880 Ай бұрын

thanks

@muzafferok910 Жыл бұрын

At last something for noobies

@henryverity5372 Жыл бұрын

Just the tutorial i needed! Would you consider doing a video on power switching? I.e switching from battery power to usb power when it is plugged in. This is a topic i can't seem to find much information on. Thanks!

@PhilsLab Жыл бұрын

Thanks, Henry! Yeah, that's actually a great idea :)

@girideshsekar7465 11 ай бұрын

Hi, amazing video. I'm complete beginner and I was able understand stuff. I have a question, for the power supply design what documents would u suggest me to go through to find if I should use a SMPS or a LDO in my design, what were the documents that u referred for the circuit in this video. a small comment would be really helpful. thanks

@Machine1136 Жыл бұрын

Question - if I use cascaded LDOs, with the first meant to regulate from 12V to 5V and the second from that same 5V to 3.3V, what will the output voltage of the first LDO be if it is only provided 5V? Will the output just be unregulated, after a body diode voltage drop of the "pass element" of the first LDO?

@PhilsLab Жыл бұрын

In general, if you apply a lower input voltage than the 'set' output voltage, the output voltage will decrease linearly with the input voltage (e.g. input minus ~dropout). The datasheet should provide a graph of output vs input voltage.

@electroroomi Жыл бұрын

Great vdo once again. When you are moving a component the designator is becoming visible ? How to turn on this function in Altium ?

@1deepakbharti 6 ай бұрын

Hi Phil, Can't we use the NC Pin 7&2 with VCC and 3V3 respectively for better power delivery

@AnjanaNagpal-ej9by 27 күн бұрын

please provide video to calculate power budget of an existing hardware design

@AlbertRei3424 Жыл бұрын

A video tuto on ferrite bead please!

@TheUeffects Жыл бұрын

Thank you so much for these awesome videos. Do you think you could make videos about rf video transmission in digital and analog ways? I think it would fit really well because you have great experience with FPGA's and analog circuitry. Greetings from Germany.

@PhilsLab Жыл бұрын

Moin, I'd like to make more videos on RF - however, haven't had much personal need. But I'll see what I can do :)

@andymouse Жыл бұрын

Nice...cheers.

@PhilsLab Жыл бұрын

Thanks, Andy!

@p_mouse8676 Жыл бұрын

Cheese!

@AnTrii7 Жыл бұрын

Thank you for video! Could you please tell, what software was used to create the sketch for linear regulator work explaination (from 4:20)? It has some vintage vibes.

@PhilsLab Жыл бұрын

Thanks for watching! I used draw.io (free, online).

@AnTrii7 Жыл бұрын

@@PhilsLab Thank you very much!

@sanjikaneki6226 Жыл бұрын

For large current LDOs how would you chose the heatsink? Also would you ever consider making a LDO from discrete parts? (asking since there was some question from sometime ago about regulated 115V from rectified mains in the US, but it was low power , and that made me think that a discrete LDO could be used there )

@PhilsLab Жыл бұрын

Figure out power dissipated in the LDO, use the thermal resistance of the LDO package to figure out temperature rise, calculate required parameters of heatsink. I'd personally only make a discrete LDO for demonstration purposes.

@HerraHazar Жыл бұрын

I have a circuit with analog sections, an mcu and adc. Main voltage is +/-15v, already regulated and stable but i need 5v and 3.3v . I need this to be low noise mainly due to the adc. I need the 5v to be exactly 5v. Can anyone give me advice on what parts to use?I imagine I need an accurate 5v regulator going into an 3.3v ldo. Is there any reason to use an 5v ldo since my main voltage is +/-15v ? Using a 7805 i have noticed that the 5v is not accurate and seems to vary from 4.8v to 5.2. Any thoughts.

@rkdgur90 Жыл бұрын

Hi! Phil. May I know when your 'Advanced Hardware Design Course' is coming out?

@PhilsLab Жыл бұрын

Hey, I have three lessons left to upload (out of twelve) - goal is to release this or next week! Will make a video once the course is live.

@rkdgur90 Жыл бұрын

@@PhilsLab I'll hold my breath until the lecture is released :)

@adam79634 Жыл бұрын

I have used LDO regulators in the past, one problem i have had is output oscilation in some case this was solved using a residtor in series with an output capacitor or a high ESR capacitor (tantalum or electrolitic). Does anyone know of any other solution to reduce output oscillations?

@lotrbuilders5041 Жыл бұрын

Generally if an LDO can accept ceramics you can use those. Otherwise, higher ESR capacitors or extra series resistance is a good method

@tamaseduard5145 Жыл бұрын

👍🙏❤

@eyallampel Жыл бұрын

What is the difference between LDO and DC-DC (buck / boost) power supply ? the DC-DC can deliver much higher currents and is much more efficient , so why not always chose the DC-DC option ? its just because LDO takes less space and BOM ?

@Lasseu Жыл бұрын

LDO has no switching noise. More like just a constant smooth DC.