Questions tagged [buck-boost]

A non-isolated DC-DC converter topology

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how to make a constant current source variable 50-150mA with up to 1k ohm load [closed]

How can I make, or can I buy a DC constant current source that I can run off a battery to supply variable 50-150mA on up to 1k ohm load? This is needed to make a constant current electric nerve ...
Drew Mc's user avatar
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Adjusting Output Voltage of a DC-DC Boost Converter controlled by STM32 PWM

I'm building a boost converter from scratch and am planning to use an STM32 microcontroller to generate a PWM signal to regulate the output voltage. The power supply voltage of the circuit is 24 V, ...
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Buck Boost Charge Capacitor Balance

For a buck boost capacitor charge balance, I am curious if adding equation 11.7 and 11.10 is correct? Or is this the average inductor current?
Mr. Blue's user avatar
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Flyback transformer -measurement of average voltage

Consider buck-boost converter using self-osc. driving, in critical conduction mode, so the duty changes according Vin and Load. Does measuring the Vx as it is shown between collector and +Vcc, ...
Michal Podmanický's user avatar
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Switch Selection in Buck-Boost Controller Designs

I have reviewed several buck-boost controller designs, including the LT8390 nd I am puzzled by the selection of different switches for the buck and boost sections. For instance, on page 27, the ...
chami's user avatar
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How to understand MAX25431 datasheet on inductor selection?

I am trying to design a project featuring MAX25431 buck-boost converter. After examining the datasheet I started the part selection for my application, but I have troubles understanding few details: ...
vorobey's user avatar
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Seeking a very low cost buck boost 3 V or 5 V to 3.3 V [closed]

I am seeking an SMPS chip for ARM/LoRa PS circuit which needs to use every drop of energy at 3.3 V from a pair of LR6-AA batteries (3V) or use 5V USB.
Peter Laidlaw's user avatar
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How to get a stable 3.3V/2A output out of a single cell (18650 Li-ion) battery?

In my tiny quadcopter, I need to power a long range wifi card which take 3.3V/2A max as input. The quad runs off a single high current 18650 Li-ion battery. Are there any chips or modules that will ...
Dave's user avatar
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Identification of IC used in Pololu 5V, 5A Buck Converter (my2101 330)

I have identified the chip on the Pololu 5V, 5A buck converter as my2101 330, but I am having difficulty finding information about this chip on any platform. I've checked the Pololu resources page (...
mastermind's user avatar
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TL494 Based buck boost converter not working properly

I was working on the buck-boost converter using the TL494 IC. The requirement is 5-50V output 10A fs=70k approx, Vin=15V. Initially, I had used a PMOS irf9450 for the switching. The simulation worked ...
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Not able to get enough current from buck boost (sepic) converter made using TL494

I am trying to build a buckboost converter for converting 5-40v input to 5-35V output at 3A max to use it for many purposes by usign TL494. I am using a SEPIC topology as i want a non inverting output....
Logesh-0304's user avatar
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Boost mode doesn’t work properly for a syncronous non-inverting buck-boost converter

I posted a related question 5 days ago. I fixed the capacitor position the same as the datasheet recommendation of the gate driver by making it connect Vb with Vs, also the one who answered my ...
loa rifa's user avatar
2 votes
3 answers
87 views

Using alkaline C cells to drive a pair of solenoids

I am working on a walking robot for my class in mechanical engineering. I have two 12 VDC solenoids that need to be actuated. Their resistance is 4 ohm so basically will require 6 amps @ 12V for the ...
remusconnor's user avatar
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Charging IC for a 1S or 3S Li-ion battery

I have quite specific problem; I'm designing a PCB for my robot, that is used the main board for controlling motors, gathering data from sensors, etc. The whole PCB will be designed as a Raspberry Pi ...
LosVocelos's user avatar
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TI synchronous buck converter went up in smoke, where do i start?

I’m using a TPSM63606RDLR power module device. Everything looked perfect for multiple days, but yesterday it started smoking. I did move the PCB and there are some LED strips connected externally to ...
Bibber's user avatar
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FET turn-on time in DC-DC converter

I am selecting a GaN FET for a buck-boost DC-DC converter application. The Vgs of the part I'm looking at combined with the gate charge and gate resistance lets me switch the FET on in about 5.3 ns. ...
entieda's user avatar
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Boost Current and Limit Voltage

I have a radar gun which has a serial interface. The gun reports the velocity out to the serial port. I want to attach a microcontroller (ESP8266/ESP32) to the serial interface and forward the ...
namarino41's user avatar
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Forward biasing of diode bridge in a discontinuous mode operation of a three phase buck-boost derived power factor corrected converter

In this paper, they said that during mode 1 the diode bridge is forward biased because the output capacitor voltage is greater than peak line to line voltage but during mode 2 they are forward biased. ...
God Pool's user avatar
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1 answer
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Peak current limit and valley current limit of inverting buck-boost converter

I am trying to understand, in a inverting buck-boost converter, why the peak current in the inductor should be smaller than the high-side current limit and valley current in the inductor should be ...
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BD8306MUV and idle current

I need to generate 3.3 V from a 3.6 V battery to power a sensor. I choose the Rohm buck-boost converter BD8306MUV for that, but I discovered that it consumes nearly 5 mA of current in idle mode ...
Tiith's user avatar
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Can you power 2 voltage rails simultaneously using a buck-boost converter?

I am designing a custom PCB and want to power 2 rails: a 3.3V and 5V rail, with a single 250mAh LiPo battery (3.7V) and need the 5V rail to have as stable a voltage as possible. I understand that a ...
rtx_q505's user avatar
1 vote
1 answer
106 views

Low power circuit design for powering an e-paper display

This is a follow up to my last question on Low power circuit design for turning an LDO on/off at specific voltage levels, where I wanted to find a low power way to turn an LDO on/off at specific ...
enwi's user avatar
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Boost converter gets hot

I'm building a LCD backlight power supply boosting 5 V to 12 V. The max current draw from the panel is 12 V 0.4 A. I am using LMR60214. But the IC is getting hot to touch at full brightness. I am ...
Balaji Narasimhan's user avatar
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Buzzing ringing in boost converter regulator when using PWM in lower duty cycle

I designed a boost converter using TI LMR62014XMF, to convert 5 V to 12 V for using as backlight source in my LVDS display adapter. The LCD display panel needs 12 V at 0.5 A max for backlight driving. ...
Balaji Narasimhan's user avatar
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Why is the output voltage (without capacitor) of a boost converter seen as a perfect square wave?

I am trying to learn about boost converters, but I don't understand why the images of the voltage output always seems to be like a square wave PWM. I understand that assuming perfect inductors, the ...
George kirby's user avatar
7 votes
3 answers
743 views

What technical progress enabled high-efficiency charge pumps?

I found a lot of information on the internet, most of which told me that charge pumps are only suitable for low-power scenarios and they are not very efficient. Charging ICs based on the charge pump ...
Bruce's user avatar
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Slow Start on 12V DC Motor

I am designing a small mechanical device that makes use of a 12VDC motor. I am trying to stick with components that can be easily sourced from Amazon or other hobby electronics stores so that others ...
Joshua Dotson's user avatar
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Calculating inductor value for my buck converter [duplicate]

I'm trying to understand the SMPS operation. The goal is to select inductor (L1) & capacitor (C1) values that satisfy the working condition below: V1: 22-26 V range. Power supply required: 1 A. ...
umh's user avatar
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Buck/boost converter behaviour when MCU is sleeping

I'm building an optical wireless mouse based on nRF52833 and a 16340 cell, I need a sanity check on some considerations regarding the DC regulation. The battery voltage goes from 4.2V when fully ...
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Synchronous buck battery charging circuit using totem pole gate driver

Background - We are trying to develop a very low cost buck (day time)/boost (night time) converter for charging LFP batteries (day time) and powering LED (night time). Due to cost impact we are trying ...
daydreamer2100's user avatar
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Protecting other circuits from Geiger power supply

I'm designing a Geiger counter power supply that boosts 3.3 V to 500 V. The circuit is a basic voltage booster. 3.3 V power line is directly connected to inductor where high voltage is generated. How ...
zerobeat's user avatar
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10 kVA Single Phase Transformer, 120 V x 240 V Input | 16 V x 32 V Output

I have a system that is running on 208 VAC. I plan to use a 10 kVA buck boost transformer to power two electrodes. The transformer has input connections for 120 & 240 V, & output connections ...
Jackdiamond's user avatar
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Can I connect an off-the-shelf boost converter and a buck converter end to end?

I have a 9~15 volt source (a battery) that I need to turn into stable 12 volts efficiently. The load (a graphics card) will draw up to 200 watts. Can I just get a boost converter and a buck converter ...
Ansis Māliņš's user avatar
2 votes
2 answers
312 views

What would be the "best" way to design a buck/boost circuit to convert 9Vdc to 10V and 5V?

I have an old console that I'd like to convert to USB-C that requires both 10V 1A and 5V 2A. Ideally, I'd like to run it off a 9V 2.2A source, so that it can be powered with a commonly available 20W ...
Marmotta's user avatar
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Forced DCM for Buck-Boost converter [duplicate]

For a SiC MOSFET-based boost converter which operates in synchronous boost converter mode, under low load condition (less than 10% of load) i.e. when the load is less than 500 W for a 5 kW converter, ...
Power_Electronics's user avatar
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85 views

MOSFET Driver, Synchronous Buck vs. Synchronous Boost

I am trying to understand the difference between synchronous buck MOSFET drivers and synchronous boost MOSFET drivers. I have a full bridge converter which can also only be used as buck or boost. I ...
Matthias Wälti's user avatar
2 votes
1 answer
643 views

Determining the switching frequency of a buck-boost converter

I wanted to try to design a buck-boost converter (instead of buying it) to drive an electromagnet. I have a 12 V source and I want to have an output of 24 V and at least 200 mA. As input I'm using a ...
Luke__'s user avatar
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3 votes
2 answers
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Supercapacitor to prevent temporary power supply voids

Hello and sorry for the improper title! We need to transmit about 50 W (5 V 10 A) through a slip-ring-ish to drive some rotating electronics and LEDs. We are using a 5 V 25 A LED power supply. We are ...
Suxsem's user avatar
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1 answer
246 views

Bluetooth speaker - power supply

I have some 10 W, 8 Ω speakers. I'm building a Bluetooth speaker set. I've hooked up a 3.7 V, 8000 mAh portable charger battery to an XL6009 buck converter to pump it to 9 V. I have a Bluetooth audio ...
Hayden's user avatar
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1 answer
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Li-Ion Battery Array: V.out ≥ 3.5 [V], I.out ≤ 1 [A] : No voltage regulation? Boost? BuckBoost? SeriesxParallel — 1x4? 2x2?

With a lithium ion cell array as follows: n.cell = 4.0 [-] V.cell.max = 4.2 [V] ...
kando's user avatar
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Separating 5v and 12v circuits using diodes, converters, and switches

I have drawn out a project with multiple power options. I am wondering if any of these reverse current protection diodes can be left out. If the double pole double throw switch can be replaced by a ...
Audo Voice's user avatar
1 vote
3 answers
128 views

DC-DC boost regulator selection question (TPS61230A) [closed]

I am a product designer self-learning electrical engineering, not an electrical engineer. In trying to design a wearable device, I've run into some difficulty in selecting a DC-DC boost regulator. The ...
Michael.G's user avatar
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1 answer
226 views

What role does the inductor and output capacitor play in a buck converter? [closed]

What role do inductors and capacitors play in buck converters? I know it acts as an LC low-pass filter. What other role does it have? When the switch opens, does the capacitor discharge in the load? ...
cvcv's user avatar
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1 answer
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Why is my boost converter not working on breadboard but works in LTspice

Here is my diagram in LTspice. And the wave should look like this in the simulation. I have tried to use the same model for my spice simulation in order top make it as similar as my breadboard ...
kile's user avatar
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5 votes
2 answers
1k views

Idea behind current mode control in DC-DC converter

I am learning about control strategies for DC-DC converters. While I find voltage mode control easy to understand, I struggle to understand current mode control. Is the idea here to control the ...
hakam zoubi's user avatar
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1 answer
92 views

Boost circuit for speaker

Years ago I build a mobile speaker with a battery inside but because of the battery dying, I decided to try to run it off USB power. The speaker is an old Creative T40 speaker and they run on 27 V so ...
Tok_Tok's user avatar
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2 answers
308 views

Find inductor for XL6019 circuit boost converter

I need a way on my PCB to step up 5V to 12V (with currents up to 2A). I've been looking at the XL6019 IC and tried to copy the design from the sample circuit of the datasheet: I'm currently stuck at ...
Janik's user avatar
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Powering 12 V LED strips via a 3S lithium ion battery pack in a tight compartment

I am working on a project for an LED lamp. We are trying to power it via a 3S lithouk ion battery pack delivering up to 12.6 V with a cutoff voltage of 9 V. The brightness of the LEDs at 10.5 V is the ...
Hatschi's user avatar
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1 answer
210 views

Can I fix a buck converter which was plugged in the wrong way? XL6009 Module [closed]

I've plugged a buck/boost converter in the wrong way (+ to -) and it instantly stopped working. Does anyone know if there is a quick fix like exchanging a diode? Which components should I measure to ...
Felix Prackwieser's user avatar
3 votes
2 answers
260 views

High-power, high-efficiency boost converter design

I have a task of creating a boost DC-DC converter that can convert 3-4 V input into 12-16 V output with 100 W power and high efficiency. There is nothing similar that I could find on the internet. ...
Isso's user avatar
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