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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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1answer
29 views

The way to efficiently operate some power devices with less loss, and appropriate heat sharing

I'm using a buck converter(OKR-T/10-W12-C made by Murata Power Solutions). The converter supports 4.5 ~ 14.0V input. The input is 9.5V voltage from the another buck device. And between of them, the ...
8
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2answers
253 views

Buck converter, squeaking/whining inductor

I have a problem with my homemade buck converter. It is based on a TL494 control chip with my discrete MOSFET driver. The problem is that my inductor squeaks and whines, when the output current ...
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2answers
102 views

Torque and speed control of a DC motor

I'm new to electronics and this is my first post so please be patient with me. Introduction I am required to design a rehabilitative exoskeleton-like knee-brace to assist sit to stand, I have faced ...
2
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2answers
94 views

Measuring the resistance of USB car chargers

I have a few USB chargers that are powered through a 12 V car receptacle. I measured their resistance with a multimeter, applying the probes to the contacts of the 12 V input. One of the chargers had ...
3
votes
1answer
105 views

How does the coupled inductor, capacitor and diode combination work?

I was reviewing a buck regulator circuit. Circuit was designed for 3.3 V output (Vout1) simulate this circuit – Schematic created using CircuitLab From this buck regulator output, a coupled ...
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0answers
53 views

Controlling Buck converter (XL4016) with microcontroller

Briefly the project I'm working on is made up of a blue pill, rotary encoder, acs712 30 amp current sensor and an OLED display. Everything is in functional state. The aim is to provide a stable ...
1
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2answers
39 views

Something wrong with open USB circuit, electrostatic problem

I faced a strange problem with the following circuit. I'm using some buck converters and an Arduino. The buck converter (Vout = 5.25v) is for a USB charger (up to 2 Amps). Well, I think the circuit ...
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0answers
55 views

Buck converter - problem with connection or disconnection of battery

I am working on a buck converter from a solar panel to a battery, in order to do MPPT. It is a synchronous buck converter, with a 12 V battery for output. I am currently trying to make a prototype of ...
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1answer
71 views

12v to 1.8v 3.3v 5v

I'm fairly new to electrical engineering, tried my hand at a power supply circuit based on the Texas Instruments buck converter TPS65261RHBR. Goal is to step down from a 12V lawnmower battery to ...
1
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1answer
28 views

Input and Output Capacitor for PoE + DCDC Controller

I am trying to design a PoE solution using MP8007. It has integrated PD interface and isolated/non-isolated ...
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0answers
28 views

Making sure power is supplied from a DPS5020 fast enough for an induction board to oscillate

Apologies in advance - I'm a software guy who likes to dabble here and there and my latest project is a little beyond the comfort zone. I'm building an induction heater (with off-the-shelf parts for ...
1
vote
1answer
78 views

Why does the PWM signals amplitude drop once connected to low-side n-mosfet switch?

I am applying a 3.3 V pwm signal to a circuit similar to the following (Credit: Olin Lathrop): I am using an IRLR024N N-MOSFET, which switches if i connect the gate to the 3V3 pin of my ...
1
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1answer
57 views

Questions on Inductor Selection guide from TI [closed]

I have been researching on Selecting inductors for Buck Application and came across an Application report from TI. I have few questions which are listed below: On ...
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4answers
68 views

Multiple Buck Converters

I have multiple buck converters, model XL4005 (datasheet ), fed from a 12V battery source to several devices i.e. My motors (require 12V), Arduino (requires 5V) and Transmitter module (require 3.3V). ...
0
votes
2answers
153 views

How can I remove 1.4MHz and 150kHz switching noise?

(Please excuse my English) I have two types of DC-DC step-down(buck) converter modules, and the switching frequencies of the converter modules are 1.4MHz and 150kHz each. The two converter modules ...
3
votes
1answer
277 views

What might this term (N sub C) be, calculating ripple current for a buck converter output capacitor?

I'm reading through the datasheet for TI's TPS54302 step-down converter, and determining values for support components. There is a calculation to determine ripple current for the output capacitor ...
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1answer
63 views

Buck converter analysis

I have to reverse engineer a PCB of a buck converter and figure out the component values. Given is that Vin = 15-20V and output is ...
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1answer
38 views

Mini 360 buck converter: 5v to 3.6v possible?

I am new to electronics and for my first project, I am using an esp8266 12 e WiFi chip to put together an air sensor web server. My breadboard prototype works but I want to add some other sensors ...
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1answer
52 views

How to choose a output cap for a 5v buck converter

I am designing a 5v buck converter as a side project, what kind of output capacitor should I choose?
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0answers
31 views

TPS562208DDCT current problem

I have attached a PSU design which I have created. The input voltage is between 12 and 24V DC. The first stage creates an isolated output voltage of 7V that is then fed into the two TPS562208DDCT (...
1
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2answers
129 views

Multiple Step-Down Voltage Rails from a single DC Power Supply

I have one working PCB which has three different Voltage Rails: 3.3V, 4V and ...
2
votes
2answers
704 views

Is it possible to convert 19.5V 3.33A to 12V 5.5A?

I have a laptop charger which has 19.5 V 3.33 A output. I want to use it for raspberry, which needs 5V and 2.5A and for monitor which needs 12V 3A. Is that charger strong enough to run the whole ...
4
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2answers
83 views

Open-loop Buck LED dimming

About this buck LED driver... TL/DR the questions: 1) I intend to drive the FET from a microcontroller PWM via a suitable FET driver. This open loop control scheme seems too simple. Is it a trap? I ...
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1answer
28 views

Estimate minimum current draw for a device

I'm trying to sum up the minimum current draw for all devices fed by a buck converter in order to determine the necessary inductance value. The max current is typically easy to find on datasheets, but ...
4
votes
1answer
72 views

What's causing my buck converter's switching node to oscillate only some of the time?

We got an order of 24 PCBs recently, and one of them doesn't work. I'm trying to track down the point of failure, and it seems to be our 3V regulator circuit: At ~180ms intervals, the 3V output rail ...
2
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2answers
146 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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4answers
928 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
34 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 ...
0
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1answer
31 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
67 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
42 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 ...
0
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1answer
49 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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2answers
100 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
72 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
51 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 ...
1
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1answer
119 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
56 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
47 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 ...
1
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1answer
49 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
93 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
62 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 ...
2
votes
2answers
81 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
63 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 ...
2
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3answers
190 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 ...
2
votes
3answers
129 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 ...
0
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1answer
82 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),...
2
votes
3answers
44 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
45 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
81 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
53 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 ...