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Questions tagged [buck]

A non-isolated DC-DC converter topology which outputs voltage less than or equal to the input voltage

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40 views

Need help checking the schematic of buck converter

I designed this circuit to work as a buck converter, using atmega32a as a controller to get PWM with 500k HZ and 47% duty cycle, my problem is that I am not sure how to connect between the control ...
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2answers
94 views

PCB layout buck converter

I am making a PCB design of buck converter 30-50V to 12V using the Max5033 IC. https://datasheets.maximintegrated.com/en/ds/MAX5033.pdf This is the first time, I am doing a PCB design for a converter ...
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37 views

Designing buck converter [closed]

I need to get the desired 24 VDC as output when my input varies between 27 to 33 VDC. For the above, I found multiple TI buck converters (IC's having 10 to 28 pins). Here! Being a newbie, I could ...
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4answers
905 views

Ways to power an Arduino from 24 VDC

I want to power an Arduino (Wemos D1 Mini) with 5 or 3.3 V from my garage door opener, which has 24 VDC available. As far as I understand, this can be solved in the following ways: Step down buck ...
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2answers
30 views

buck converter inductor lm2576

I was curious and looking at the datasheet of the buck converter IC LM2576, looking at the inductor selection guide it feels counter intuitive to me. Why is the inductor value needed reducing as we ...
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1answer
25 views

Boost Capacitor of Step-down converter

I'm working on the LT8607 Step-down converter to convert from 12V to 5V/500mA output. The circuit schematic is as below. What is the purpose of using the BST capacitor as shown in the schematic.
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1answer
64 views

Power supply question in regards to powering 400 LEDs

I have WS2812B LED strips, that has 144 LEDs per meter. The ratings are: 43W/M .3W/LED .06A per LED Input Voltage of 5V DC The recommended power supply stated by the website is 5V DC and 10A for 1 ...
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3answers
31 views

Buck converter input current

How to calculate the input current consumption of the buck converter. It's seem that the output current only depends on the output voltage, duty cycles, input voltage, and coil inductance. Does the ...
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1answer
39 views

Burst mode in synchronous buck converter with current mode control?

I read this previous question: The meaning of Burst Mode It says burst mode happens when the resistance of the load is light and the system stops switching the MOSFETs. However, I just cannot ...
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0answers
21 views

Typical break time of an input power loss of a DC-DC buck chopper

For my graduation project I am using an LM2596S-ADJ module to power a raspberry pi 3 (power consumption 5V 2A). I want a rough idea of how long it would take to cut off the power to the pi if the ...
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2answers
96 views

Buck, Boost..etc Is there always an IC for that?

First of all I am still in school so perhaps I have not been exposed to material that may answer this question for me. I have recently become interested in power electronics. I have purchased a book ...
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1answer
49 views

How does soft start work in TI buck regulators?

I am planning to use "TPS54341" in my design. I am curious about how the soft start circuit internally works in TI regulators. The datasheet explains to how to use it, however, does not go in much ...
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2answers
45 views

Modifying a buck converter for lower current rating

I have been learning about buck converters and I think I understand the principle of their design. However, I am unsure of how a current rating would be calculated for a particular design. The ...
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1answer
107 views

What is the purpose of the op-amp feedback circuit?

This is an existing circuit of buck regulator circuit I have been reviewing with.(Here I have not mentioned the part number of the due to the confidentiality issue) Following is the screenshot of the ...
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1answer
54 views

Buck converter inductor calculation doesn't agree with typical application schematic

Im trying to play around with some buck converters and have found one that I might want to make a circuit with. The IC I want to use is the the TPS53125 in QFN package. It's a dual output buck ...
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1answer
35 views

How to increase current output of capacitor bank with buck booster?

I'm pretty novice when it comes to electronics given that my background is in mechanical engineering. But I am trying to design a circuit that can take a 5V (almost 0A current) to charge a capacitor ...
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1answer
44 views

Acceptable Buck Converter Output

I've just put together my first busk converter with a LMR16006Y-Q1. http://www.ti.com/lit/ds/symlink/lmr16006y-q1.pdf Here is what it looks like on the scope. The Pink signal is unloaded, the other ...
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2answers
66 views

DC/DC Converter Output Power Rating

Looking at chips such as AP6502A TPS5430 The output capability is rated in peak and continuous current. Why are they not rated in terms of power? What output voltage is this current rating for? ...
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0answers
59 views

DC-DC buck output voltage

I am designing a DC-DC step-down converter (asynchronous) and I would like to achieve a Li-Po charging with it (18 - 22 V input voltage). My goal is the CC/CV charging but to do this, I need constant ...
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2answers
56 views

Buck converter load disconnection

We use a buck converter to drive a resistive load with varying voltage/power. Now we detected a problem with load disconnection at high duty cycles where the driving mosfets and the flyback diode burn ...
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2answers
53 views

Rectifier, Flyback vs Transformer, Rectifier, Buck

I've just finished doing my first off-line flyback, which proved a success. A simple block diagram is as follows: I know this topology seems common now, for example it is used in Apple USB Charger ...
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3answers
173 views

Designing brake light with specific luminous intensity

I am currently designing a brake light for a Formula Student car and I am looking into existing solutions on the market for inspiration. The two specific solutions are this, and this. The LED I found ...
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3answers
118 views

Can I convert 72V to 12V using potential divider?

In our automation project, we'll be using a buck converter to convert the DC voltage from 72V to 12V. This method of conversion is quite expensive!! We are converting the voltage to power the ...
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1answer
79 views

Correct power supply for my project

I am making an autonomous bot where i need to power a few sensors (IR, PIR, sonic,etc) and an arduino. In total the sensors draw about 300 mA current(max). My power supply is a LIPO of 12 V (11.1 V),...
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3answers
41 views

Setting current on Diodes Inc PAM2863 LED driver IC, with external resistor AND driving different voltage to VSET

I'm looking to use the Diodes Inc PAM2863 DC-DC LED driver in a project. The datasheet gives a V=IR method for setting the average output current with an external resistor, where Iout = 0.1 / Rs. ...
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1answer
44 views

pmp6712 active buck snubber operation

I need to design a clamp circuit in order to clamp the ringing voltage of a square wave. Therefore, I am planning to use the circuit given below. This circuit belongs to TI however, I couldn't get any ...
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1answer
51 views

Voltage drop pulse transformer

I'm trying to design a buck converter controlled by a PWM signal. The PWM signal and the converter is isolated with a pulse transformer. My issue is that the pulse transformer behaves differently ...
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1answer
43 views

TL5001 buck converter issue

I have constructed the following 12v in - 3.3v out buck converter circuit using a TL5001 PWM controller based on this document. After etching PCBs and soldering surface mount components the board ...
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1answer
108 views

Configuration of Multiple Buck Regulators on One PCB

I have been doing a lot of switching regulator research for a board design that uses two buck regulators on the PCB to get 9V and 3.3V out from a 12-28V DC supply. The majority of my questions have ...
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2answers
69 views

Buck-converter dynamic output-voltage using digital-potentiometer

I am driving a load at 40 V, 4.8 A, and would like to dynamically change the voltage being supplied to it, ideally creating a 2-40 V range with increments of <0.1 V. To achieve this, I am thinking ...
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2answers
74 views

Any downside to feeding a buck regulator into a linear one?

I need to convert 12 V down to 5 V and 3.3 V. I am using linear regulators right now but they get pretty warm and eventually I would like to supply more current for it (around 500-700&...
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1answer
34 views

Cathode of Rectifier diode connected to GND of Error amplifier circuit

[![enter image description here][1]][1]I've this circuit of 60v to 12v buck converter. In this UC3845B is used for gate firing. I didn't get one thing in the circuit that the Cathode of rectifier ...
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1answer
69 views

Buck converters

I have seen many high watt like 1200 or 1500 watt boost converters and not a buck converter with that high wattage or power rating . I'm planning to make one buck converter (input- 35 volts output-3 ...
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1answer
44 views

Making sense of TI power-designer sims

After a day of struggling with trying to simulate an LM2678 based buck converter (see: this post) another user suggested using TIs online power designer web bench tool to simulate. Selecting a design ...
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2answers
52 views

How to set output voltage on this dual output buck converter board? [closed]

I guess this board's dual output voltage is configured by the EN terminal? Resistance to ground? (Link to the eBay listing: 20W DC-DC Step UP & Down 5V-35V 12V 24V to ±5V ±9V ±12V ±15V Dual Power ...
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83 views

Low output voltage on buck converter

I am making use of the LM2678 adjustable version switching regulator in the design of a 5.5V buck converter. I made use of the design equations detailed here: lm2678 datasheet For the following ...
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1answer
170 views

Trying to power 100 Arduinos from single power line

I'm trying to power up to 100 Arduinos that will be spread across a 25m wall using a single power line. The idea is each Arduino will have a few a few buttons, leds & an oled screen and will all ...
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1answer
37 views

LTC1775 Buck converter component question

I am trying to design a 12v,10A buck converter using a with LTC1775 and have gone through the calculations assuming a 40% inductor ripple current and a switching frequency of 150kHz. This gave an ...
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109 views

Buck converter with uc3843

I'm not much experienced in electronics and have no idea whether or not this attached circuit will work .Im trying to make a buck converter with 20A output current and cc cv mode so i choosed uc3843 ...
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2answers
116 views

Running 20 WS2812 LED strips (80 pixels each) from a single Arduino and 24V Power Supply with Buck Converters

I am building a matrix with 20 WS2812 LED Strips. Each strip is 80 pixels for a total of 1600 pixels. I want to drive them all from a single Arduino Mega board. To handle the power needs, I have a 24V ...
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1answer
246 views

Why my Buck converter is undergoing smoke and fire

I am new to electrical. I am powering my router from 24V battery. But power requirement of router is 12V/1A. So I am using LM2596 buck converter. The specification for this buck converter is as ...
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0answers
61 views

How to protect a buck DC-DC being backfed from the load (e.g. a battery as a load)?

Background I want to design a DC-DC adapter that is foolproof and has some protections in place so that it doesn't accidentally damage the somewhat expensive equipment downstream. Here's what I have ...
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0answers
61 views

Sloppy DC pre-filtering for 24V → 5V 1A Buck converter

I have done DC converters before, both the curious way (AVRing it) and the lazy engineer's way (applying a datasheet formula) but it was always from nice DC sources with a fairly big filter cap. Now, ...
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2answers
257 views

Current relationships across a voltage step down convertor

This question arose from a conversation over the weekend and we tied ourselves in knots trying to get to the bottom of it. I didn’t have time to put a simple circuit together so it would be great to ...
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2answers
73 views

high current buck converter?

I am in the process of building a power bank with 18650 batteries for a trolling motor. The nominal voltage for this battery is 14.8 V. The motor specs are 12 VDC - 45 A max current draw. Now the ...
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3answers
69 views

Is there a Semisynchronous Buck Topology which mixes the advantages & disadvantages of both?

I was looking at "What is the purpose of using MOSFET instead of free-wheeling diode in Buck topology?" and the referenced PDF which discusses the trade-offs between a traditional asynchronous Buck ...
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1answer
41 views

LM2596 Cin requirements

I'm going to use an LM2596. My maximum input will be 40V to a fixed output 5V 3A. I've read in the datasheet that for Cin you need 1.5x for an electrolytic capacitor. So 40V x 1.5 will be some 60V. ...
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3answers
142 views

How does using a DC-DC step down converter save power?

I understand how DC-DC buck converters save power when compared with a linear regulator, but do they save power when compared to not using power conversion all together? In my specific case, I have a ...
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2answers
124 views

Altering switching power supply schematic to generate 5v instead of 3.3v at 5A

Im fairly new to this level of more complex circuit design so forgive me if I sound like a newb. I'm creating a DC/DC Step down buck regulator using the LM22678 switcher from texas instruments: http:...
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2answers
95 views

Simple Buck/Boost/Other Topologies building tutorials [closed]

For educational reasons, I want to build physical DC-DC converters. I would start with simple buck or boost topology. For start, I wish to have a simple gate-drive for switches, without PWM modulation....