LDO Deep Dive - Power Regulation in PCB Design: Part Two

Рет қаралды 10,335

Күн бұрын

In the second part of our Power Regulation series, we dive into LDOs or Low-dropout regulators. LDOs are simple, plug & play, and easy to place in your design. Before you wire a high voltage input to an LDO, watch this video to understand voltage ranges, efficiency, dropout, and more.
0:00 Why Do You Need a Power Regulator?
1:15 Error Amplifier Circuits and LDOs
1:43 What Happens in the Operational Amplifier Circuit?
2:59 Reference Voltage in LDOs
3:16 Efficiency and LDOs
3:51 Exploring LDOs and Voltage, Dropout
8:31 Input-Output Differential Increases and LDOs
9:56 When to Use a Buck Regulator
10:14 Dropout Voltage Changes and LDOs
13:00 Power Regulation Strategy with Buck Regulators and LDOs
15:53 Try CircuitMaker
Learn More about LDOs and Efficiency Here: resources.altium.com/p/testin...
LDOs Vs. Switching Regulators - Power Regulation in PCB Design: Part One: • LDOs Vs. Switching Reg...
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Пікірлер: 20

@jasmenelee Жыл бұрын

Brilliant, especially the graph showing the Input/Output Voltage vs Short circuit current for LDO voltage selection.

@harrydymond4488 2 жыл бұрын

The error circuit is not using positive feedback. The error amplifier is driving a PMOS transistor and there is in effect an inverting action from the output of the error amplifier to the output of the transistor. So, although the feedback signal is going to the positive terminal of the error amplifier, this is still negative feedback (due to the inverting action of the output transistor)

@Zachariah-Peterson 2 жыл бұрын

Thanks for catching Harry, yes you're correct I slipped up on that one

@victortorres2080 2 жыл бұрын

Hello Friend, good videos on the topic of "Power Regulators", hoping to see soon the PCB design with LDO, Buck, etc and their respective real considerations.

@tomyr95 4 ай бұрын

You're videos are awesome! You're a rockstar! Thank you!

@danielrioux54 Ай бұрын

At 10:20 when you present the impact of output current on the minimum input/output differential voltage you are using the LT1086H, listed at 0.5 A and not LT1086, listed at 1.5 A. The minimum input/output differential voltage for the LT1086 at maximum output current (1.5 A) is even lower than the LT1086H at maximum output current (0.5 A). Past 66% of its maximum current the LT1086 exhibits a shard in crease of its minimum input/output differential voltage which is not seen in the LT1086H past 66% of its capacity. You missed an important issue.

@leeslevin7602 2 жыл бұрын

Brilliant. Thank you.

@AltiumAcademy 2 жыл бұрын

Glad you liked it!

@MrAlistar28 2 жыл бұрын

thank you so much for these videos

@AltiumAcademy 2 жыл бұрын

You are so welcome!

@samamani5423 2 жыл бұрын

thank you..

@rolandoaguilera3114 Жыл бұрын

Typically a flyback converter is used when stepping down from a rectified AC voltage (Vac x sqrt(2) -> 25/12Vdc)

@asad5986 2 жыл бұрын

For the Error amplifier, is the FET specifically a MOSFET? At 8:43. Why would the current drop? If voltage increases and resistance is constant, wouldn't current increase? Around 14:30ish, why not just use multiple LDOs to step down, instead of a buck regulator? Wouldn't you be able to get rid of the disadvantages the buck regulator brings?

@Zachariah-Peterson Жыл бұрын

I Yes generally a MOSFET, although some circuit diagrams will show a BJT. About the current drop, I'm not sure about this, I would have to look into it. About the multiple LDOs, yes I've seen multiple LDOs in series but the current can get limited to a low value at each stage, so just be careful with that. This is something you might see with processors that need multiple core voltages.

@jameslmorehead Жыл бұрын

Why cover linear regulators as specifically only LDOs? LDOs are just a subset of linear regulators. Of which, LDOs are the least forgiving of linear regulators. This would probably have been better covering the venerable LM7800 series. Then look at the LDO version.

@Zachariah-Peterson Жыл бұрын

Well then maybe we'll just have to do something on the LM7800 series. Also we felt LDOs was a decent place to start because they are so frequently used in so many systems, including digital, RF, etc.