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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141 views

Using Buck Converter as Solar Charge Controller ? (see pic)

Can I charge Li-Ion safely by connecting PV Panels to a CC CV Buck Converter then through BMS to a 3S3P batteries? This is basically a plan for a very small solar powered device that takes in solar ...
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376 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
141 views

When and how does a buck converter behave in a boost converter mode?

My question is with reference to this answer for this previous question. The answer states that a buck converter will behave in a boost mode for some cycles during light load or no load condition. Can ...
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1answer
196 views

NCP3420 failing in buck converter

I designed a constant current buck DC-DC super-cap charger with the NCP3420 as a dual MOSFET driver. The current is hysteresis controlled and the disable and PWM lines are pulled low on power-up. The ...
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1answer
460 views

Should I be concerned about the test frequency?

I am using a LMR16006Y buck converter with a 4-65V input to 3.3V output 600mA. I am a little confused on the choice of the output inductor. The Y version outputs @ 2.1MHz. The inductor I am looking at ...
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33 views

Help troubleshooting my 1st hobby project using small solar panel [closed]

Since I am very much a newbie with electronics, please bear with me if I miss any important details or have inaccuracies in my description of the problem. I have a 10W solar panel, which under my ...
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35 views

How to reduce noise Buck converter at constant current mode ACT4088

Hello i am using a ACT4088US-T (datasheet here) Buck converter and i made it to run in constant current mode 500[mA] through a Diode (D5): Everything works fine. It draws 500mA no matter the load i ...
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3answers
781 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
140 views

Intertrack spacing and decoupling cap package for high voltage buck regulator

We're routing a PCB for a LM5085 buck controller of 8 pin WSON package with a maximum input of 75V. My questions are for the relatively high input voltage 0603 is the smallest input decoupling cap I ...
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22 views

How to do high frequency simulations in simulation softwares (proteus, multisim, etc)

So i am trying to build a buck converter which requires switching at high frequencies. Before making the whole circuit however, i decided to use a circuit simulation software so that i can experiment ...
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29 views

Buck converter small signal model

Hi Recently, I am using the buck converter to charge the battery, and I am confused, how to model the buck converter in small signal, when load is a resistor, I can know the duty to output, duty to ...
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176 views

Changing output voltage of a buck converter by electronically swapping the feedback resistors

I am going to design a circuit which is going to output some digital signals. The output stage of the circuit will have some level shifters. The level shifters will give flexibility to the user to ...
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44 views

Can using Interleaved PWM signals increase the resolution in a buck circuit?

I have a working, normal buck convertor circuit but I would like to vary the output current in finer steps. I'm limited now by the duty cycle resolution of the PWM controller. I'm looking at ...
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1answer
238 views

Is isolation required for MOSfet gate driver's and microprocessor's power supply?

I have designed a 62W , 24V-5V buck converter operating at 250KHz. I am using TI's UCC27200A gate driver and Infineon's Optimos 4. The problem is that the driver doesn't have any kind of isolation ...
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1answer
82 views

battery voltage supply too high for electronics

I am driving brushless DC motors with an STM32 blue pill. My application includes said STM32 blue pill, L6234 motor drivers, 2 MPU5060 gyros and 2 AS5048a encoders. I am using a 14.8V battery to feed ...
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11 views

Open Loop Gain in Buck Converter

I'm trying to understand this application note from On-Semiconductor regarding the loop control design of buck converter Designing Stable Control Loops for High Current Voltage Mode Synchronous Buck ...
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1k 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 ...
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72 views

Buck converter design review - updated

Last week I asked this question attempting to find a solution to efficiently converting higher voltage to lower voltage. From the answers, I arrived at TI Power Designer and I ended up with this ...
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0answers
46 views

MIC28515 overheating with high input voltage

I've designed this MIC28515 buck regulator based on the manufacturer schematic reference. I'm planning to run it at 70VIn I'm doing the tests with @ 5V 2A load Temp(Amb) = 20C. When I set a VIn of ...
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3answers
718 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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2answers
549 views

LM2596s-Adj dc to dc buck converter

Does the schottky diode current rating affect the performance of a dc to dc buck converter when loaded? Im using a 1N5822 shottky type instead of a 1N5825 on a National Semiconductor LM2596s-Adj based ...
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1answer
43 views

Buck Converter Bad Regulation

I'm working on a 5V buck converter circuit. Below is the schematics: The circuit is designed using the LM43603-Q1. I put in an input voltage of 8.4V into the PCM_IN pin. I used a variable load to ...
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2answers
44 views

Can a fixed output buck have too much output capacitance?

I'm working on a design with this buck regulator: tps62130 I'm using the 5V fixed output voltage version. I'd like to have significant capacitance on the 5V output because the device can be powered ...
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1answer
42 views

Error in resonant converter simulation

I designed a closed loop resonant buck converter using voltage mode control and simulated on PSIM. Here is my circuit:- This gave correct results. Now I want to design an input filter so I simulated ...
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2answers
76 views

How to create a high power buck converter power supply? [closed]

I am building a device that requires a lot of energy at its peak, about 30W. The kind of supply I want to build looks like this: I understand that this is made of a controller which switches a ...
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0answers
40 views

Buck boost converter inductor rating

I am designing a buck boost converter with a 12v output, and 50A current output. The input range is 8v-14v from a supercapacitor. However based on the Texas Instrument buck boost design sheet Basic ...
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41 views

on/off pin problems with the LM2678 5.0

PCB: My name is Ertuğrul. I made a regulation board with an LM2678 but I have a problem: I provide 12V input but I can not get 5V output. I only get 5V with the on/off pin enabled, but the datasheet ...
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60 views

Buck converter placement on PCB

I want to place this XL4015 buck converter board on my PCB. Is it reliable to mount this module directly above digital logic IC components using spacers? I am not sure if the module has a good ground ...
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1answer
32 views

Multiple buck converters and their draw

This is another LED pixel project that I'm looking to power in a slighty different way. It's 110no. 5050 SMD pixels on a 300mm x 300mm board. The long and short of it is that I'll use USB-C Power ...
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1answer
112 views

Buck converter problem

I have this buck converter - BD9G201EFJ-M Buck converter specifications: Input voltage - 18V to 32V Switching frequency - 300kHz Output voltage 9V Load current - 0mA to 200mA maximum. I am ...
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2answers
64 views

How does increasing the capacitance affect the output voltage for a buck converter and boost converter?

From the formula of charge relating capacitance and voltage, $$ Q = CV $$ Capacitance is inversely proportional to voltage. This is how I got the idea that possibly when increasing the capacitance, ...
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1answer
51 views

Is there a mathematical representation that represents the output voltage of a buck or boost converter in discontinuous mode?

Recently I have learned that in buck or boost converters, the output voltage depends only on the duty cycle and input voltage in continuous conduction mode or when current is continuous. However, in ...
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1answer
53 views

Buck converter current

I have this synchronous buck converter. Input voltage - 8.7V Output voltage - 5V Switching frequency - 350kHz to 450kHz Output load current is 2A Schematic: I have an input capacitor of 68uF and an ...
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2answers
59 views

How does a boost converter allow for a gain in output voltage by just switching the positions of the inductor and switch?

I get that in a buck converter, a low pass LC circuit was attached and this effectively filters out high frequencies. If the bandwidth is configured so that it is lower than the switching frequency, a ...
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2answers
558 views

Practical buck converter output voltage too high for given duty cycle

I'm attempting to implement a buck converter as shown in the schematic using a p-channel mosfet as a switch. I'm having difficulties implementing this circuit practically. The simulation produces a ...
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3answers
3k views

Do 100% duty cycle buck converters have no voltage drop?

I am currently designing a circuit which should be able to take 12-28V DC power in and output 12V DC @ 1.5A. The question is: is this possible with a 100% duty cycle buck converter (like TPS54302)? ...
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1answer
165 views

State Space Average Model of Non-Ideal Buck Converter

I've been learning power electronics and am trying to design a dual-switch forward converter. One of the things I've been trying to do is derive the small-signal equivalent circuit of the non-ideal ...
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3answers
81 views

Components for adjusting the current and voltage of a very high energy power supply

I have two microwave transformers in series connected to a Cockroft Walton voltage multiplier. This allows me to generate well over 1 million volts (measured by spark gap) at high current (it looks ...
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34 views

Why is my buck converter getting hot when voltage is supplied to the output?

I have a buck converter (LM2596) converting 12V to 3.3V to power an ESP32 off of a 12V battery. When I power my ESP32 via USB and it is connected to the output of the buck converter but the buck ...
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1answer
24 views

Buck converter AP65111A gives no power when bootstrap capacitor is connected

I'm using AP65111A buck converter and it works fine. It has typical beginner-level ripples, somehow manages to keep the voltage under moderate load and so on. However, following the schematic 1:1 for ...
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1answer
69 views

Best way to Step down 6V DC or 9V DC for 3.3V DC operation

I am basing on TIs TPS62745DSSR. I have the circuit above and I want to use two CR2032 coin cell batteries to power VCC_IN. I have made this circuit based on info collected from the internet. My load ...
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1answer
74 views

Buck Converter EMI simulation output LTSpice

I am trying to do an elementary EMI analysis on my Buck converter circuit by modelling the LISN circuit. I am using LTSpice for this. The buck converter works when I simply simulate this circuit alone:...
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3answers
150 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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3answers
1k views

Android Device Using Buck Converter (Voltage Regulator) instead of Li-Ion Battery

I have a project that is basically replacing my car's instrument panel with an Android device (a tablet). I managed to make everything work except for one thing: the Li-Ion battery of the tablet was ...
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2answers
58 views

LDO and buck converter

I heard someone said, using LDO is better than buck converter, but I don't know why. Why is an LDO better to be used with op-amps than a buck converter?
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1answer
144 views

36x LED 5730 in series: diodes burnt when LED driver (based on BP9833A or MT7854BD) powered up

Background: I have 18W, 36 LED lamp fixture which I cannot change. Originally it has 2x parallel 18off 5730 LEDs and 300mA driver. It works for some time, but diodes starts burning. I thought that ...
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55 views

Absurd screeching from a buck convertor

I got a buck converter from Amazon. This- https://www.amazon.com/MCIGICM-step-down-Converter-3-0-40V-1-5-35V/dp/B06XZ1DKF2 Now it's soldered onto a custom PCB I designed. I'm supplying it with 12V and ...
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1answer
29 views

What is the relation between the control voltage and resulting pwm in a voltage-mode control system for DC-DC converters?

I'm currently learning about negative feedback and voltage mode control for various DC-DC converters. I'm very confused about how the control voltage changes the pwm signal, along with how the ...
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1answer
109 views

How to step down the voltage efficiently

I need to power three devices/loads from a single DC source (a 48V at 200A battery). The buck converter used is this. The three loads are: RFID reader (24V DC @ 2.1A) Rasberry Pi 4 (5V DC @ 3A) DC ...
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1answer
209 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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