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Questions tagged [buck-boost]

A non-isolated DC-DC converter topology

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Can someone please help me. I am trying to design a buck-boost converter [closed]

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Victor Bolodeoku's user avatar
0 votes
1 answer
31 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
79 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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0 votes
1 answer
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Bluetooth Speaker - Power Supply

I have some 10w 8ohm speakers. I'm building a bluetooth speaker set. I've hooked up a 3.7 volt 8,000mah portable charger battery to a XL6009 buck converter ( https://www.amazon.com/dp/B07NTXSJHB?psc=1&...
Hayden's user avatar
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1 vote
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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1 answer
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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
115 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
0 votes
1 answer
65 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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0 votes
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
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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
0 votes
1 answer
56 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
0 votes
2 answers
51 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
81 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
200 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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0 answers
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Simulink boost converter problem

I am working on a Boost converter model in Simulink for a school project. The model should resemble charging a battery(18V) with a 12V DC voltage source and a boost converter. With the internal ...
hakam zoubi's user avatar
1 vote
1 answer
89 views

How do you drive the gate of a MOSFET in an inverting buck-boost converter?

I'm currently working on implementing a buck-boost converter for MPPT of a solar cell, the gate of the transistor is to be fed 0-3.3 V PWMlogic and I am planning on using a gate driver IC to combat ...
DomJP's user avatar
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0 votes
0 answers
34 views

Boost Converter doesn't work after simulation works fine

I designed a custom board and I just got it. I checked the boost with Vin=14.4v( the operation required to be with battery) Once the boost gets enabled, he is trying to take a current but in a strange ...
Knowledge's user avatar
  • 317
9 votes
1 answer
609 views

Why is buck-boost efficiency not specified for ultra light loads (μA)?

When browsing for buck-boost converters I've looked at many datasheets and I've made an observation that I'd like to question. I have a low-power application and energy consumption is one of my ...
Alexander Ohm's user avatar
1 vote
0 answers
31 views

Understanding average Iq of buck boost converter (skipping and switching modes)

I'm trying to pick a buck boost converter for a low power, small battery, long life device. The datasheets specify different supply currents for different modes and I just can't wrap my head around ...
Alexander Ohm's user avatar
3 votes
1 answer
108 views

Will this charge pump work?

I am trying to make a charge pump for a project of mine. I'll be using some spare transistors I salvaged from an old tube TV and I intend to use the increased voltage for a high-side gate driver for ...
kale hops's user avatar
2 votes
1 answer
109 views

Use a MOSFET to switch a 25V power source between two loads with backflow protection

I would like to switch the output of a buck-boost converter (input) between a powerbank output (output1) and a charging circuit (output2). The buck-boost voltage output is between 5V and 28V. The ...
Florian's user avatar
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0 votes
1 answer
124 views

54 V to 5 V using LM2576HV

I have a requirement to convert 54 V battery output to 5 V. My battery's positive terminal is grounded. I tried the connection as mentioned in the datasheet which is attached here, but as soon as I ...
Nikhil Pandya's user avatar
0 votes
1 answer
136 views

Boost converter vs. voltage regulator

I am trying to make a thermo-electric generator for a school project, and I need a voltage regulator to keep the USBA output at a constant 5 V. However, I have some step-up boost converter modules at ...
fibonacci_ostrich's user avatar
1 vote
1 answer
48 views

How to connect in serial two 2S Battery pack but charge them seperately?

I want to create a circuit that has input 12V DC and uses this voltage both charging two 2S (7.4V Li-Ion without balancing wire with BMS Circuit on the pack) batteries and at the same time supplying ...
torosluadam's user avatar
2 votes
4 answers
275 views

How does a buck converter maximize the power in the MPPT system?

How can a DC-DC buck converter be used to maximize input power in an MPPT system? I know that an MPPT system consists of a processor that reads the power source and manages a buck converter to ...
Barry Allen's user avatar
0 votes
0 answers
57 views

Modelling of a DC-DC Buck boost converter

I'm looking for some help with the following questions as not 100% where to start. I'm looking to derive the model for the averaged circuit of the buck-boost converter. My understanding is that I ...
Ben120's user avatar
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0 votes
1 answer
153 views

Power MOSFETs used as a switch in DC/DC converter circuits in saturation region

So I have explored various high voltage DC/DC converter circuits. Consider a boost converter where you have a low side switch where entire load voltage appears across the switch which is MOSFET VDS ...
needbrainscratched's user avatar
0 votes
2 answers
149 views

Do I need a buck or boost converter to charge a lithuim battery with solar and wind energy?

I am doing a school project in Matlab Simulink to design a battery charger. I need to use solar and wind energy to charge the batteries. Since both solar and wind are not always constant voltage and ...
Wal Os's user avatar
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2 votes
1 answer
89 views

Buck-Boost Converter Inductor Value

I am designing a typical buck-boost converter using the LTC3530EMS#PBF IC from Analog Devices. My design specs are as follows: Vin: 3.0V - 4.2V Vout: 3.3V Iout(max): 300mA Fsw: 1MHz In the datasheet, ...
RGB Engineer's user avatar
0 votes
1 answer
36 views

Ripple problem when using a type III Compensator for buck boost converter

I need your help, and from my last question here, I understand I need a closed-loop for my design, which helps to reduce the output overshooting. Below is the plot. From the plot you can see my ...
ikenna's user avatar
  • 43
1 vote
2 answers
73 views

Automatic buck-boost DC-DC 1-15 V to 5 V, 5 A

I've a big 3000 F 6 x supercapacitors bank to work as an aux USB power hub. It gives power while linearly losing voltage to 5 V, then it stops working, because I'm using a 5-15 V to 5 V DC/DC ...
setec's user avatar
  • 135
1 vote
1 answer
62 views

9 V to 12 V step-up converter to drive load between 10-100 mA, and no load

I'm working on stepping up the voltage from a 9 V, 150 mA power supply to 12 V, with a load of 10-100 mA and moments where there's no load. I have implemented something similar with this IC ...
Citi's user avatar
  • 149
1 vote
1 answer
89 views

Discrete high-side driver for GaNFET

Background: I am designing a buck/boost converter to convert back and forth between my supply voltage of 3.6 V (battery) and an output voltage of VDD = 60 V to bidirectionally drive a capacitive ...
Son-mic's user avatar
  • 11
2 votes
2 answers
594 views

Why is my boost converter output lower than expected?

I have simulated this boost converter circuit in LTspice: According to this calculator, I should be getting 140V output. My output is only 115V. I suspect it's something to do with the MOSFET, but I ...
Movieboy's user avatar
  • 197
0 votes
1 answer
73 views

Boost converter design issue

For a circuit I'm designing, I want to use an MC34063AL-D08-T DC/DC converter (or a similar one; I just need a through-hole package) as a boost converter to boost a voltage Vin = 3.3-4.2 V (coming ...
luigi's user avatar
  • 1
1 vote
1 answer
98 views

Buck–boost converter on a lithium battery with a variable DC output

I have a battery with a DC port that is rated 9-12V 10A. I don't really know what that means. My guess is that the voltage of the DC port can go from 12V to 9V when the battery capacity is low. I need ...
Mathieu Carbou's user avatar
0 votes
0 answers
62 views

How to slowly store higher voltage from low power source?

I want to use a small solar panel (about 1V 15mA in ambient light) and then boost its voltage to 6V to slowly charge a 6V battery or capacitor. I have experimented with some generic boost converters, ...
NO_GUI's user avatar
  • 153
2 votes
1 answer
1k views

UC3843 voltage drop problem

I have assembled the following circuit. In no-load mode and even up to 0.5 A current everything is fine, but when more load is placed on the circuit, the voltage drops to 2.5 V. If I reduce the value ...
MReza Hadi's user avatar
1 vote
1 answer
114 views

Purpose of capacitors near the input of DC/DC boost converter

I recently bought this DC to DC boost converter (input from top; output from bottom). It has all the parts as a usual boost converter topology suggests: a mosfet, a diode, an inductor, and capacitors ...
HYQ's user avatar
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0 votes
1 answer
273 views

Using BC547 instead of S8050

I found this schematic on a website. This is a buck converter. They used S8050 as the gate drive transistor. Can I use BC547 instead of that?
Md Golam Robbani Rohan's user avatar
-1 votes
1 answer
97 views

Small footprint AC to DC converter [closed]

I want to build a 3 kW AC to DC converter but the two-winding transformer is too big for my project. I want it to be small as possible. What are the possible options and their advantages and ...
Marc Paul Eumague's user avatar
0 votes
0 answers
64 views

Charging and discharging Li-ion cell dynamically

I intend to use an EBL 6F22 5400 mWh, 9 V Li-ion block as buffer for an USB-level solar charging station. It comes with a micro-USB charging slot and necessary voltage regulation. Not much can be ...
jake_asks_short_questions's user avatar
2 votes
2 answers
93 views

Which topology should I use for energy harvesting

I am making a energy harvester design but am confused which of the following circuit should I use to amplify and filter my harvested voltage. The first topology is the synchronous switch harvesting on ...
Sig nema's user avatar
0 votes
0 answers
44 views

Issue from my buck/boost converter

After my simulation, I am getting this in my output, which does not look good at all. I find it difficult to find a spice model for DC/DC isolator that can give me a positive, negative supply, and ...
victor_uk's user avatar
2 votes
2 answers
177 views

Boost battery voltage without regulating it

I'd like to boost the voltage of a lithium battery while having the converted voltage reflect the battery's state of charge (such that the output voltage equals the input voltage plus a set amount). ...
Misa's user avatar
  • 21
0 votes
0 answers
41 views

protect from in rush current of buck convertor

I made a PCB base on the following schematic, it uses a buck convertor for 12 to 5 v and then uses an LDO for 5 to 3.3 to run my ESP module I use 2 P-channel MOSFET for polarity protection , but ...
Hamid s k's user avatar
  • 195
2 votes
2 answers
88 views

Buck-boost converter (LTC3442) not producing output until excited

EDIT: Added datasheet for the inductor and some oscilloscope measurements. I'm using a LTC3442 buck-boost converter from Linear Technology / Analog Devices (datasheet) in my design to produce a 3.3V ...
Johan E. T.'s user avatar
4 votes
1 answer
356 views

Why is buck-boost converter showing a different trend than buck and boost in efficiency peaking point?

In general I was under the impression, the efficiency is highest when input and output voltage are close to each other. This holds good for boost (text book image below) and buck (personal experience)....
Divya K.S's user avatar
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