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Questions tagged [buck-boost]

A non-isolated DC-DC converter topology

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1answer
27 views

Buck Converter and WS2812 LEDs

So to start off I am powering 70 LEDs through a 24V 6A power supply. The WS2812 LEDs require 5V operating voltage and about 50mA at their brightest setting (white light). I'm having this really ...
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2answers
54 views

I want to boost 0.45V and 0.6mA to 0.7V and 3mA suggest me a circuit which can do that

I'm doing a project that basically transfer the power from a laser and light up an led using it. The power output we are getting from the laser is at most 0.45V and 0.6mA (we used photodiode to ...
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0answers
33 views

KCL and KVL in AC AC Buck Boost Converter

This is the circuit of ac ac buck-boost converter with 4 switches. When \$V_{input} > 0\$, switch 2 and 4 are fully turned on and switch 1 and 3 controlled by D and (1-D) respectively, and vice ...
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1answer
27 views

Increasing TPS63001 Under Voltage lockout from 1.8V to 2.5V for use with LiFePO4 cell

The Under Voltage Lockout threshold for this chip ranges from 1.5 V to 1.8 V. I want to use this with a LiFePO4 cell, whose minimum voltage is 2.5 V. With reference to the datasheet here, the VINA ...
1
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1answer
72 views

Current sensing techniques in SMPS

I have gone through the following circuit provided by microchip technology and I get trouble in understanding the circuit circled in red the the image!! As I understood, this circuit is used as a ...
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0answers
39 views

Buck/Boost Regulator Problems (TPS63070)

Questions: 1.) Why do input voltages of 9v and higher cause the regulator to output voltages in the range of 1.2v to 2.0v instead of the configured 3.4v if a load is connected to the output when 9v ...
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1answer
104 views

explain the working of this circuit [closed]

I'm basically trying to understand how this Dc to Dc step-up converter work. please help me.[![dc-dc step-up voltage converter 1v-9v][2]][2] I need to design a DC DC step up converter using bjts. ...
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0answers
26 views

Battery Powered System and Input Capacitance

I have a battery powered system in which the battery is connected to a buck/boost converter to derive 3.3V from two or three AA batteries. The regulator I'm using is a TI TPS63050, and it has a power ...
2
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2answers
60 views

Buck/Boost converter interaction with MCU in sleep mode?

I am trying to design a battery powered remote controller that has the following components, TPS63802 (converter), AP9211 (battery charger/protection), Atmega328 (MCU), NRF24 (transceiver). The ...
0
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1answer
60 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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0answers
117 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 ...
3
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1answer
111 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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0answers
67 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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0answers
31 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
68 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 ...
0
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1answer
72 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
77 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 ...
0
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1answer
71 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 ...
1
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1answer
118 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 ...
3
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4answers
284 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 ...
3
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1answer
116 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
125 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 ...
2
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2answers
323 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 ...
1
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1answer
275 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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1answer
112 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
84 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
302 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 ...
3
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3answers
481 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 ...
2
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3answers
254 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 ...
1
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1answer
46 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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2answers
100 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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0answers
40 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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0answers
21 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 ...
0
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1answer
78 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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39 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 ...
0
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1answer
121 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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1answer
66 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 ...
3
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2answers
295 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. ...
2
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0answers
70 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 ...
1
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1answer
215 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
86 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
48 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 ...
1
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1answer
325 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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0answers
110 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 ...
1
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1answer
478 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 ...
0
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0answers
177 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
76 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
98 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
103 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 ...