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Questions tagged [buck-boost]

A non-isolated DC-DC converter topology

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57 views

Small DC voltage boost without step-up boost circuit?

I have a simple DC circuit (Arduino related) with a USB power supply that's giving me 4.9V. Is there a way, with minimal components and without using an inductor, to boost that voltage to 5.2V? I ...
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54 views

Buck-Boost Controller Arduino Nano vs STM32

I have 900W (150W*6Panels) solar panels and 12V inverter (1000VA) which have inbuilt PWM solar charge controller. The distance between pannels and inverter is around >10m and the wires are 6 sq mm ...
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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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64 views

What are the drawbacks of using a ferrite inductor in a boost converter circuit

I have dissected a boost converter so I can remake it on my own PCB. It works fine but I am now experimenting with using different inductors to reduce the overall footprint. I tried installing a ...
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19 views

SEPIC vs. ZETA feedback

When I was reading through the RECOM book of knowledge DC-DC, I found out that the SEPIC converter has more chance of having resonance feedback than the ZETA converter. They mention that the SEPIC has ...
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2answers
52 views

Buck Boost Battery 3.6V (Lithium-thionyl Chloride) to 5V

I hope this question has not been asked and it's not as far as I have seen. I am developing an IoT project which uses almost no current (< 100uA) when sleeping and up to 80mA when running. The ...
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1answer
65 views

Adjustable non-inverting Buck-Boost converter failing right after starting in boost-mode

I am designing an adjustable non-inverting buck-boost converter based on LM5176 chip. Adjusting is done by DAC via feedback network, more on that technique can be found here. The input voltage is 32V ...
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2answers
76 views

The output of a boost converter doesn't stay at 5 V

Let me start by apologizing for my english in advance :) I'm trying to build an UPS for my raspberry Pi (even though I have basically zero experience in electronics). When the power cuts out, I want ...
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47 views

Low power design, choosing correct buck-boost converter for LiPo battery

I want your opinion on subject considering low power applications. I want to build basic loraWan tracker with Murata Lora module(3V3), and I want to use LiPo battery. What Im struggling with is power ...
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1answer
94 views

Buck-Boost converter not working right when fed by dynamo

So my plan is to charge a powerbank with a bicycle dynamo. I have got it to work with a full bridge rectifier and a linear regulator, it just isn't very effective. I used the following circuit: (The ...
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4answers
253 views

How to convert a wide voltage range (1 V-12 V) to 5 V?

I have an unusual application where the input voltage can vary from 1-12 V DC. This must be converted to 5 V @ ~200-250 mA. Since there are no available buck-boost converters suitable for this wide ...
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1answer
108 views

Buck/Boost Power Supply: What happens if we use much bigger Bulk Capacitance (i.e. 10x)?

If we take a buck/boost converter that is known to function correctly, but increase the bulk capacitance by 10x, what can we expect to happen electrically? Background: I took the design below off TI'...
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2answers
103 views

Boost converter with battery issues

I have a battery application. With an 11.1 V battery input, I need to maintain a 12 V, 2 A output as the battery discharges. I bought a 1500 mAh, 11.1 V LiPo battery pack with a 35 C rating and I ...
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2answers
226 views

Cheap way to power blue LED on coin cell

I need a cheap way to take a 3v nominal coin cell and power a 3.3 forward voltage blue led. It needs to be cheap in production on a large scale, so a rudimentary joule theif won't work. Ideally it ...
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1answer
256 views

TPS63070 Buck-boost not bucking or boosting correctly

Can some check my layout since I am using TPS63070 buck-boost regulator and I would like to get 4.7V output at TP12 but I am getting 11.5Vwhich is wrong and don't know why? Base on the Datasheet R1=...
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69 views

Gate Driver topology for Buck boost Converter

I am implementing inverting Buck-Boost Converter in hardware as shown in the picture attached. The output of this converter is negative. so I will have an issue with its gate driver. The gate driver ...
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1answer
64 views

Boost converter for High Output voltage and High Output current

I want to design a variable power supply. I need to get output voltage from 7.5 to 30 V and output current of 0-40 A. One of the above values will be fixed while the other changes. This is for ...
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4answers
284 views

Why doesn't a boost converter help overcome USB cable resistance?

I ran a long USB extension cable from my pc to a WiFi adapter. The cable was too long and the gauge was too thin. So the resistance made the voltage drop to ~3V under load, making the WiFi adapter ...
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3answers
458 views

is a voltage regulator required for atmega328p when powering from boost converter at a set voltage?

I know that linear voltage regulators are more accurate at holding the required voltage but the boost converter i am using seems to keep a pretty steady one. the voltage will of course be within the ...
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3answers
176 views

Dual power supply with two boost converters

I currently have a dual power supply, that supplies +/-15V. One -output of the PS is connected to the other channel's +output (GND). Now, the problem is that I need +/-50V. I bought two step-up boost ...
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1answer
41 views

LTC1775 Buck converter component question

I am trying to design a 12v,10A buck converter using a with LTC1775 and have gone through the calculations assuming a 40% inductor ripple current and a switching frequency of 150kHz. This gave an ...
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80 views

state-space model for bidirectional buck-boost with input capacitors

I'm having some trouble simulating the behaviour of a bidirectional buck-boost converter for battery charging purposes. The circuit looks as follows: I would like to create an averaged state-space ...
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38 views

Analysis of the full bridge bidirectional converter's buck mode operation?

This is the circuit I was trying to learn. Here is the equivalent of the buck mode operation: And following is the waveform in the buck mode of operation: My intention is to derive the output ...
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19 views

Dedicated li-ion step up drivers

I have a design which will include the optional use case of boosting up to 7V from a li-ion battery. I can't seem to find any drivers dedicated to li-ion for this? There seem to be a few buck boost ...
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1answer
60 views

Can I use dc-to-dc converter to step up voltage of 20 3.7V 3Ah lithium-ion batteries connected in parallel?

I want to use this 3.7V 40Ah powerbank to power my e bike's 48V hub motor. So would it be a bad idea to step up 3.7V all the way up to 48V? Would there be a huge Ah loss?
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31 views

DC to DC boost current problem

I am attempting to boost a DC power source (from either 12V20A PSU, 12V 120W car cig port or 14.8V 10aH Lipo) to 26.1V and 6.9A (or 4.5A) using the car cig port taking power limit into account. I am ...
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1answer
94 views

buck converter doesn't work [duplicate]

I am doing my project. and it's about a DC-DC converter. I am using HCPL 3021 as a driver for the MOSFET IPPR045C7. in open loop cicuit, I am using Vin=60V, with duty cycly = 60% of PWM signal (F=...
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45 views

Low coupling capacitor of a SEPIC / ZETA / CUK for Wireless Power Transfer using coupling capacitance

I am studying a converter, which is a modified version of a Buck-boost, which is basically a SEPIC converter with very low coupling capacitance. The low capacitance comes with the need of wireless ...
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1answer
62 views

Buck Converter - Ripple Current

I think I understand the buck converter operation (continuous conduction mode) except I'm a bit confused about the ripple current. Here is what I know so far I understand everything up until the last ...
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2answers
290 views

How to pick a capacitor to adjust loop compensation caused by reactive load?

I do wish to add a voltage regulator between a Li-Ion battery pack and a 36V 220W rated mid drive pedalling assist motor with integrated controller. The caps of that controller have a 63V rating. ...
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0answers
67 views

Is a 90V output spike normal for a 45V buck boost converter?

The LT5176 buck boost converter outputs a short 90-91 volt spike at at the output in the 2nd second after startup, applying power to Vin. Schematic More details at Why does this buck boost with ...
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1answer
155 views

Running 5v 4A device using 18650 batteries

I'm working on a project involving a SBC, IR LED's and a screen. All of them together draws 3.5 to 4 Amps and voltage of-course is 5v. I'm hoping to run this using 18650 (3.7v), I have a couple of ...
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1answer
81 views

LTC3534 - Buck-Boost not working

I am trying to incorporate a Buck-Boost DC-DC converter into my design using the LTC3534 and I cannot seem to get it working. Below I will post images of the datasheet recommended design, my ...
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1answer
44 views

PD compensator matlab

I have a little problem which I cannot understand, control theory is not my specialty but I have been reading on it lately. I have a buck-boost converter which I modeled on matlab and I am trying to ...
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1answer
276 views

3.3V Buck-boost converter outputting voltage too high

I'm using a buck-boost converter RT6150B with fixed 3V3 output. I followed their application notes, and here's my circuit setup: Note: I used 22uF for C4 intead of the recommended 20uF for output ...
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0answers
54 views

Stable 12V 1.5A

I'm in need of a stable 12V 1.5A power which I could carry with myself. One way of doing it would be to strap, say, 12x 1.2V rechargeable batteries and use LM317. But then I read about buck ...
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97 views

designing a high voltage non inverting buck boost

Hi i'm trying to make a non inverting buck boost that will have a 50 volts output and can deliver a 10 amps of current...i followed the calculations from the texas intruments pdf...the question is, It ...
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1answer
357 views

Driving a Peltier w/ PWM or analog out [duplicate]

I feel like this has been beaten around the bush in a couple other topics, but I am hoping to find something a bit more definitive. I am looking to control a Peltier thermoelectric cooler. I've got a ...
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165 views

Why does this buck boost with dual MOSFETs fails output at certain input voltages at light load?

Buck boost design A buck boost converter for 11A 45V output and 33.0-55.0V input has been designed using the Webench Power Designer. The LM5176 based PCB design was adapted for dual MOSFETs (4 times ...
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2answers
65 views

Capacitor for Transient

I am designing a board for my project which is powered from 4.2V Li-Ion Battery. I am using a buck-boost converter ADP2504 for powering the board which outputs 4.0V constant voltage. I have buzzer on ...
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1answer
82 views

TI LM3488 SEPIC, adjustable power supply down to 0 volts

I decided to make an adjustable power supply with input voltages from 3 to 6 volts (4A), and output voltages from 2 to 12 volts. But I had a thought, that as long as I'm making it, I should make it go ...
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1answer
91 views

TI LM25118 buck boost, variable power supply

For a part of my next project I'm required to make a variable power supply module. I have never designed a power supply and I would like to make my life as easy as possible. Thats why I would use ...
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2answers
219 views

Can you place two boost converters in series to boost 3v to 180v?

I am looking to build a power supply for a NIXIE tube. They need to output 180v at 4ma but will run off of a 3v lithium battery. The battery can take the current requirements for the input, but at the ...
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3answers
299 views

how to design circuit of high side MOSFET switching with bootstraping and mosfet driver ic?

Hey im starting to learn about MOSFETs at my university classes, but Im having trouble trying to design a circuit for a buck boost converter for a MPPT solar charge controller. The part pushing me ...
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1answer
92 views

What exactly is the point of specifically 'inverting' buck/boost converters?

I'm planning on generating a negative voltage for a circuit i'm working on, and want to use an inverting buck topology to do this. With the application being battery powered, my primary concern is ...
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3answers
111 views

Current consumption of devices [duplicate]

I want to use boost converter to to supply higher voltage to LED .I have confusion about which smps power supply to use on input side. From specs. I am unable to understand why input current ...
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5answers
959 views

Boost converter, how does diode allow current from inductor to flow towards capacitor?

So I watched this video to understand how DC-DC boost converter works. Here's circuit diagram: And I don't get, when switch is off, and polarity in the inductor is such that positive is on the right,...
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2answers
2k views

How to calculate how long a supercap can provide power

What's the formula to calculate how many seconds a supercapacitor can provide power when employing a buck/boost converter? Also, how different would that calculation be when using a pair of supercaps ...
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0answers
393 views

Why my charging circuit always heat up and malfunction?

I am working on troubleshooting bunch of overheating PCBs. I found that 2 components on my charging circuit always heat-up or malfunction even after replacement. The first problematic component is ...
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2answers
81 views

Boost operation in inverting Buck-Boost converter

Regarding the inverting BUCK-BOOST shown in figure, I understand how it works as Buck. Please explain how it can act as a BOOST. Because during the off time there is no connection with input supply so ...