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DC-DC(Buck) shuts down when LDO enabled (intermitent)

Here are a few suggestions to diagnose and potentially resolve this problem: 1. Check for Inrush Current: The inrush current when the LDO enables its load might ...
Phi's user avatar
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0 votes

Mode selection for Boost converter

By referring the documentation provided in ti.com I was able to calculate the Inductor ripple current which was equal to 72A That's not too far off: - My ideal boost calculator indicates that the ...
Andy aka's user avatar
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1 vote
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Control multiple LM2596 with just one potentiometer

There is no link to a datasheet or schematic of the LM2596 based buck-convertor in the question. The onsemi LM2596 datasheet shows the following test circuit: Which shows the resistors (...
Chester Gillon's user avatar
1 vote

Control multiple LM2596 with just one potentiometer

Each regulator requires feedback from its own output. You can't control 20 adjustable regulators by connecting them to single potentiometer. If you want to fix the voltage, replace the pot with fixed ...
Justme's user avatar
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-1 votes

Can I join a 5v 5050 RGB LED strip to a 12v 5050 RGB strip?

Yes. Your model typically requires an input voltage of at least 7V to 35V to properly regulate to 5V. However, the LM7805 can get warm when regulating higher currents, so you should you a heat sink in ...
PNPTransistor's user avatar
5 votes

Are unregulated charge pumps used in some applications?

Normally, at low currents, where the switching loss of a capacitive load is tolerable, and where regulation isn't required. High power levels are discouraged because the startup current especially can ...
Tim Williams's user avatar
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2 votes

Are unregulated charge pumps used in some applications?

One use for unregulated charge pumps is raising 1.2 or 1.5 V NiMH or Leclanché cell to ~3 V to power LED's. Here, intrinsic current limiting of a charge-pump can be an advantage. One of the older ...
DrMoishe Pippik's user avatar
0 votes
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How can I protect a DC/DC converter when VIN is floating?

Usually there would be two problems. Over current and over voltage. It's unlikely that over current would be an issue as the DC/DC converter should be current limited and it already has a current ...
Voltage Spike's user avatar
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3 votes

Correct Implementation of Flyback Diode, TVS Diode, and Snubber Circuit for Buck Converter?

Always start with the datasheet: The TPS62136 and TPS621361 are high efficiency and easy to use synchronous step-down DC-DC converters [ed: emph] The application diagrams show no catch diode, nor RC ...
Tim Williams's user avatar
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3 votes

Correct Implementation of Flyback Diode, TVS Diode, and Snubber Circuit for Buck Converter?

First, D8 isn't a TVS diode. and if it is, it's the wrong symbol. NBD, rookie mistake. Also, this isn't where you would typically put a TVS. Flyback diode (D6) is in correct location and orientation. ...
MOSFET's user avatar
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1 vote
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Analysing 42v to 3.3v DC converter circuit & component identification

Looks like a simple linear pre-regulator for the LDO. The two big transistors are connected in parallel, and the little transistor (G1k) is connected as a Darlington combination with them. There's a ...
Dave Tweed's user avatar
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2 votes

Kapton instead of air gap (ferrite core)

1mm is rather thick to build up from polyimide (Kapton(R) is a brand) tape, but yes, that will do. Mind that the adhesive layer is smooshy, so the thickness may not be as consistent as you'd like, or ...
Tim Williams's user avatar
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2 votes

Kapton instead of air gap (ferrite core)

You can use anything like that. Kapton is chemical and heat resistant so it's a reasonable choice. Note that you get double the effect of the (somewhat better) option of reducing the center post ...
Spehro Pefhany's user avatar
2 votes
Accepted

Kapton instead of air gap (ferrite core)

I can put 1 mm thickness of Kapton, is it right ??? Kapton tape is a good solution I've sanded down ferrites with no problem You can try sanding an outer edge just to prove it to yourself However, a ...
Andy aka's user avatar
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1 vote

6V 3W solar panel and to charge phone through a DC converter XL6009E1 via a 12V 2A car charger

6V 3W is only 0.5A. In theory, if you step it up to 12V, then back down to 5V, then that could give 0.6A. But that assumes 100% efficiency at each conversion, which isn't ever going to happen. So ...
Simon B's user avatar
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4 votes
Accepted

Boost converter does not work according to the theories

Welcome to Power Electronics! Here's my strategy for moving forward on this: Replace the transistor and diode with ideal parts, as follows: Replace Q1 (NPN 2SC1815) with an ideal switch, with an on-...
Fabio Barone's user avatar
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2 votes
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How do the switches and level translator work in the LMC7660 Switched Capacitor Voltage Converter

The datasheet explains this on page 6: In the circuit of Figure 11, S1 is a P-channel device and S2, S3, and S4 are N-channel devices. Because the output is biased below ground, it is important that ...
Jonathan S.'s user avatar
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3 votes
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A question of control of flyback converters

It's totally possible to control a flyback with a pure current load. One trick you can use is to employ current-mode control, rather than voltage-mode (PWM duty cycle) control. You could, for example, ...
Jonathan S.'s user avatar
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5 votes
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What conditions create subharmonic oscillations in switching converters?

The 50% threshold is oft-repeated and erroneous to begin with, but you haven't taken note of the specific case under which it arises. There are two common cases actually, that I'm aware of: For ...
Tim Williams's user avatar
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1 vote

Calculate Li-ion discharge time for two different loads, one after the other

Still ambiguous - is the 3000mAh spec for one cell? Or one pack? I'll assume it's for the whole pack for the analysis (the solution will be doubled if this assumption is wrong). I'm also going to ...
MOSFET's user avatar
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0 votes

LTspice AC/DC converter with DC/DC boost converter

Any notes or ideas would be amazing. Well, if you are trying to have a power-factor-corrected regulator then you will still need a small capacitor across the bridge output (i.e. before L1). And also, ...
Rohat Kılıç's user avatar
0 votes

Circuit design for adjusting the electrical load of a small wind turbine (MPPT)

An ideal buck converter has no power loss, so if the output voltage is 20 V, the output current must be 2 A. Step down to 10 V, and the current must be 4 A. But if the load resistance is the same, how ...
susk's user avatar
  • 41
1 vote

Energy harvesting using LTC3108 not working

You will NEVER get this circuit to operate properly (or at all) using a protoboard, or small test leads or any other source of input resistance (such as an ammeter). You must remember that you're ...
David Salerno's user avatar
6 votes

Help is needed with IC identification

I found the schematics here by searching for your P5WE0 Schematic, landing here, then checking Rev 2.0. Then I Ctrl+F searched the PDF for PU6 since that appears to be the part designator labeled on ...
vicatcu's user avatar
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