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Questions tagged [buck-boost]

A non-isolated DC-DC converter topology

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Troubleshooting Voltage Sensing Issues in Buck-Boost Chip Simulations

I performed a simulation on a buck-boost chip (LT8390). I understand that the sensing resistor placed between LSP and LSN is supposed to sense the differential voltage. This voltage is then amplified ...
chami's user avatar
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Is a buck-boost converter good enough as circuit protection for an automotive application?

I am designing a circuit for a automotive application that requires a stable regulated 12V supply. The supply in turn must be powered by an automotive battery. I am currently looking at using a ...
Jayson Okhman's user avatar
1 vote
1 answer
64 views

Using Buck-Boost as LED driver

I am trying to use a buck-boost controller like LT8390 as a LED driver. This controller can act as a current controller if the current through sensing resistor connected to (ISP/ISN) can be adjusted. ...
chami's user avatar
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Enable/Disable Power of Board with ESP32-S3

I am using TPS63001 Buck-Boost Coverter with a 3.7 Li-Ion Recharable battery. I want to Control Power of the board with ESP32-S3-Mini. Enable pin of the TPS63001 is connected to MCU and its also ...
Zunuran Nasrullah's user avatar
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1 answer
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Sensing Resistor in Buck-Boost controllers

In the LT8390, there are two sensing resistors. The one connected to LSN/LSP is called RSENSE(Buck), and the one connected to ISP/ISN is called RSENSE(BOOST). To illustrate this more clearly, I've ...
chami's user avatar
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Peak current-mode controller

I am studying a peak current-mode controller, and here is the schematic without slope compensation: Before introducing RSENSE to the design, I understood that if feedback voltage increases, it is ...
chami's user avatar
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2 answers
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Why doesn't the polarity of the inductor reverse in this buck-boost?

Given the buck-boost below Fig. 3.33, page 62 from Fundamentals of Power Electronics 3rd edition by Robert W. Erickson and Dragan Maksimovic If we assume the transistor is in conduction mode and the ...
ganymede's user avatar
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FET selection and quantity for buck-boost converter design

I am working on designing a buck-boost converter where the input voltage is 24 V regulated, and the output voltage ranges from 12 to 48 V with a current rating of 5 A. The design should also allow for ...
chami's user avatar
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3 votes
6 answers
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What is an intuitive explanation on how a buck and boost converter transfer energy?

I can understand how a buck converter can step down the voltage but only with the formulas. I am struggling to understand intuitively how the inductor stores energy and releases it in a way so that ...
Albert's user avatar
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Feedback compensation on a buck-boost led driver

I tried to calculate the compensation network for a TPS92692 in buck-boost topology and I can't find the same value for the typical buck-boost led driver (page 41 of datasheet). Section 9.2.2.2.12 ...
msch's user avatar
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Possible noise from tps63020(buck converter) that is affecting audio MAX98357

I'm pretty new to the engineering but I hope this will be an easy question for those who have done much job in this area. So I'm making my own pcb that consists mainly of esp32-s3, 2x tps63020 (3.3 ...
Aleksei .C's user avatar
5 votes
2 answers
280 views

Non inverting buck boost transfer function

When considering the compensation of a non inverting buck boost (single inductor), the datasheet considers to take into account the worst transfer function between the buck transfer function and the ...
Jess's user avatar
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1 vote
3 answers
65 views

Can I supply two different voltages with the same boost converter?

I have a VFD matrix display that needs both 90V and 70V to power on. I already designed a boost converter that will give me the 90V. I was wondering if I can just put a voltage divider at the output ...
MXVG's user avatar
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2 answers
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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, ...
Dmarm's user avatar
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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?
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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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1 answer
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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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-1 votes
1 answer
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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
1 vote
1 answer
191 views

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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2 votes
1 answer
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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
1 vote
0 answers
211 views

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 ...
kam1212's user avatar
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1 vote
1 answer
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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
1 vote
0 answers
60 views

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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68 views

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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0 answers
73 views

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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2 votes
2 answers
271 views

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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1 vote
1 answer
62 views

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
1 vote
0 answers
22 views

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
1 vote
1 answer
71 views

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 ...
X.LI's user avatar
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1 vote
1 answer
36 views

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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1 vote
4 answers
114 views

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
114 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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1 vote
3 answers
109 views

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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0 answers
45 views

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
0 votes
2 answers
131 views

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
771 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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0 votes
1 answer
171 views

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
0 votes
2 answers
1k views

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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2 votes
1 answer
81 views

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 ...
StefanoN's user avatar
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1 vote
0 answers
59 views

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
0 votes
1 answer
102 views

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
0 votes
2 answers
76 views

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
0 votes
1 answer
49 views

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
317 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
0 votes
0 answers
50 views

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
0 votes
1 answer
97 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
870 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
  • 309
3 votes
2 answers
822 views

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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