Questions tagged [buck-boost]

A non-isolated DC-DC converter topology

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1answer
38 views

State-Space-Model from more dimensional Transfer-Function

Im trying to extract the State-Space-Model for an cascaded Buck/Boost-Converter from an set of Transfer-functions \$ G(s)\$ (which I generated with Plecs/Matlab). First of all I want to analyse the ...
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111 views

How might I increase incircuit voltage from 2.5 DCV to 3 DCV

I'll cut to the chase, an about me is at the bottom of this post... I have a standard NE555P fader circuit powered via a 1.2V battery boosted by a QX5252 with 220µH axial inductor (which according to ...
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32 views

solar PV bypass diode v buck boost v SSR

I have 20 185W panels in two strings each to a ginlong GCI-2k inverter. The panels are W facing 45deg, between two pitches with some chimneys. The prediction for latitude and moderate shading is ...
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42 views

Boost converter voltage drop

I used both the TPS610986 and TPS61291 boost converter in order to power a load that consumes around 200mA in both situations (TPS610986 powering the load then use the TPS61291 to power the same load)....
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2answers
60 views

Diode selection for step-down Converter

I have built quite some buck converters for ~3A@3-5V (~1MHz, 24V Input) and I always used schottky diodes due to their low forward voltage drop (and therefore low power dissipation during free ...
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26 views

Can't find definitions of model irfs4010

I'm trying to run on the LTSpice the circuit below. It's the circuit of a Boost-Converter. When I try to run, LTSpice shows the message "M1: Can't find definition of model irfs4010". Sorry if i'm not ...
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1answer
54 views

How to generate positive and negative power supplies from a single supply with high current driving capability?

I am trying to build a 1553 military standard bus transceiver (analog front end) and I am required to use a single power supply of 3.3 V. To be able to receive, my comparators need supplies of +/- 3.3-...
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2answers
81 views

One step-down regulator 24 V to 1V or two step-down regulators with lower steps?

I am trying to design a working principle scheme to step-down the input voltage from 24Vdc ---> different low voltages (1.8 V, 1 V, 1.5 V, 3.3 V with ripples ~ 1%). Could you kindly explain me the ...
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2answers
73 views

What the difference between a buck-boost converter and buck-boost controller?

I was looking for some buck boost power management IC for my circuit i have noticed that in Texas instruments website the buck - boost is categorized into 2 category converter and controller googling ...
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35 views

Design power bank with BQ24195

I want to design a power bank control board for a single-cell lipo battery. The IC I have selected is BQ24195 by Texas Instruments - datasheet here. I think it is perfect for what I need. It comes ...
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3answers
1k views

Why are boost/buck converters never fully integrated/all-in-one?

Moving from small arduino applications to higher-power applications for work, I've had to switch from using simple linear regulators to switching boost/buck converters any time a different voltage to ...
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1answer
47 views

Could you power a complete circuit using a Dc-Dc boost inverting IC?

I was making a circuit, and i was limited to using one Dc-Dc boost inverting IC, with a power supply of 3.8V. I used the Dc-Dc to make -5V on its output, and (if i change the polarity of its output) i ...
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2answers
77 views

PWM-Switch Model of a Cascaded-Buck-Boost

Im trying to develop the PWM-Switch Model of a Cascaded-Buck-Boost. First of all i want to extract the Large-Signal Transfer function for the Buck-Mode. I'm working through the book "Switch-Mode ...
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0answers
59 views

Modelling DC/DC-Converter

i want to model a cascaded Buck/Boost-Converter with FAST like mentioned here: https://cbasso.pagesperso-orange.fr/Downloads/PPTs/Chris%20Basso%20APEC%20seminar%202013.pdf. The goal is to implement a ...
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1answer
65 views

State-Space Model of a Buck-Converter in DCM

I have a problem getting the State-Space Representation of an Buck-Converter in DCM. There are 2-Switch Cycles between one Period. If the Switch is closed the Circuit looks like: after applying ...
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48 views

Parallel LTC3127 based software controlled supercapacitor charger

I am trying to charge 3 supercapacitors rated for 2.7VDC-300F connected in parallel, giving a total of 900F@2.7V. The IC I am trying to use is the LTC3127 from Analog Devices(Linear Technologies). I ...
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1answer
46 views

ISL85403 buck-boost converter

I have a requirement for a 24V +- 15% rail to power a laser sensor off of a 24V lead acid battery pack. I implemented the reference design provided by renesas for a 12V buck-boost converter(...
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1answer
50 views

How does an inductor limit a voltage booster?

I’m making a voltage booster to boost li-ion voltages 3v-4.2v to 5v with high current and a small footprint. I’m using TI’s Webench tool to help. It suggest a 1uH inductor for a 12A load, but if I ...
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2answers
73 views

Dividing output voltage from a buck boost converter

I am a student in high school and have been working with buck boost converters. I currently have a buck boost converter that steps up 5V to about 58V. I created 3 voltage dividers that should step the ...
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53 views

bode plot of LM3481 as boost converter

I have simulated an open loop boost converter using LM3481 average model, given by texas instruments and I got a very strange bode plot (More precisely, strage phase response), please can you tell me ...
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2answers
61 views

Buck - Boost converter inductor selection

Hello i am creating a circuit that uses the TPS63070 buck-boost converter. As i was looking at its sample circuit and application in the datasheet on page 18 (under Inductor Selection), i am given 4 ...
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1answer
28 views

Simple Solar Circuit

I had a very cheap solar panel + controller where the controller died. To cheaply replace it I was going to build my own using some parts I had laying around and use a step-down (LM2596) to limit ...
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0answers
51 views

How to activate FP6293 converter from EN pin?

I'm making a portable device which is powered by a lithium battery and boosted with a FP6293 boost converter IC. I want to turn on and off the device from a switch that activates and deactivates the ...
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1answer
49 views

Ramp compensation for UC1843 and UCC38C44

When we pick up the datasheets of UC1843B-SP and UCC38C44, we notice that they have the same functional block diagram, specially the PWM generator circuit (Error amplifier, current sensing PIN and the ...
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1answer
73 views

What would happen when supplying lower voltage against boost converter?

I'm new in these field. So, help please :) 3 Questions about buck-boost dc-dc converter, the module is: XL6009. I've seen this: Behavior of Boost and Buck Converters What would happen when supplying ...
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1answer
46 views

Current Sensing Design

while using MCP1630 in switch mode power supply design, in the datasheet they gave the input bias current of the "current sense pin" what are the considerations the designer should take while ...
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1answer
62 views

How to create a buck-boost converter with a low-voltage cutoff

Hello i would i am in need of a constant voltage regulator to power my motors, as voltage will affect the motors rpm. Although i could compensate via software, i would like to add a hardware ...
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1answer
138 views

Problem with Proteus Simulation of Buck Boost Converter - please help

I built the attach circuit, I was simulating a solar panel buck boost voltage regulator to regulate the output voltage. The problem is that while it works and shows the appropriate output. It doesnt't ...
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41 views

Current mode boost converter design

I was trying to design a current mode boost converter in CCM using a MCP1630 and the specifications of the design are as follow: ...
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0answers
58 views

Placing Input capacitor of boost after output capacitor

I have a battery charger for 12V input with integrated buck that charges a single cell (3.7V nominal). The charger also has a power path and I would like to place a boost converter to boost the 3.7V ...
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2answers
80 views

Inductor current ripple ratio of buck boost converters

I have a question about this paper: https://ieeexplore.ieee.org/document/1210630 I have always thought that the maximum current ripple of a buck converter occurs with a duty cycle of 0.5. The paper ...
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2answers
123 views

Power electronics DC DC converter question: What is the function of the capacitor and resistor connected between two series inductors?

This is a power electronics DC DC converter question: What is the function of the capacitor and resistor connected between two series inductors? This is part of the schematic from a photovoltaic ...
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2answers
76 views

LTC3112: Limited Output Current

So for the past couple of days, I was testing out the LTC3112 Buck-Boost IC from Linear Tech. I'm using this for my heated glove project to step up/step down the voltage across the heating element. ...
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1answer
28 views

Output voltage of NPC1403 boost converter circuit 0 during simluation

Currently, for my needs I'm trying to boost a 5v input to 15v with a minimum of 20ma current at the output. I found the NPC1403 to require my needs however, when i'm trying to simulate using EasyEDA ...
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1answer
79 views

how to choose a dual power supply for rail to rail amplifier?

I need +15VDC and -15VDC dual supply for rail to rail supply of op-amp. I have found buck-boost inverters used for this task. I have a doubt whether the inductor in the buck-boost inverter circuit can ...
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1answer
74 views

Designing a 6V --> 40V step up converter [closed]

I need to design a step up converter with the following requierements: Vin = 6V - 8.4V Vout = 35 - 40V, Iout = 2.5A Could anyone give me some insights on how to ...
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1answer
108 views

Noise in portable power supply to guitar effects pedals [closed]

I am constructing a battery powered power supply for a guitar effects pedal board. There are 5 pedals and I am using a phone charging battery and a boost converter to supply 9V (centre negative) to ...
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1answer
74 views

DC-DC Converter - Why is the input voltage called Vg?

In the textbook I'm reading (Fundamentals of Power Electronics 2nd Ed, Erickson and Maksimovic), the input voltage for several different types of converter circuits is labeled Vg. The textbook gives ...
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1answer
73 views

Complete discharging of Initially charged capacitor through Inductor

I have been trying to simulate a parallel resonant circuit in Pspice . The idea of the circuit is to discharge C18 (Cin) completely (This cap is initially charged to 1.3 V) through the inductor and ...
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1answer
127 views

Buck-Boost converter without low side switch

Please look at the buck -boost converter below. It is 2 outputs, one buck and one boost output. Would the circuit work as describe in the picture? In what condition the circuit will it work? If so how ...
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1answer
32 views

LTC7813 buck-boost IC max output power

I am developing a power supply for a 24V 10A BLDC motor, which has to work with car and truck batteries (12V-24V). The real thing is that those batteries never have 12V nor 24V, instead, they could be ...
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2answers
172 views

How inverted buck-boost Boosts & Bucks

I am struggling to see how the "inverted buck-boost" converter works the same as a "4-switch buck-boost" converter. In my mind, a 4-switch buck-boost is simply connecting a buck and boost together, ...
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1answer
66 views

Buck/Boost converter TPS63070RNMT is not working properly

I am working on a Buck/Boost converter design which is based on Buck/Boost converter TPS63070RNMT. Below is the schematic design. All the selected components are as per the Section 9 of the datasheet. ...
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1answer
43 views

DC-DC charging different voltages

I have several banks of batteries on a boat, two larger banks 48v electric propulsion system with regen 12v house bank Each has a charging source the 48 has regen up to 2kw while sailing The 12 has ...
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2answers
63 views

is it possible to boost up the current by keeping the voltage constant?

I have a source that can deliver 20mA and 4.5V (MAXIMUM). I need to boost the current to 1 A without using any further source. Also, the voltage should be maintained constant at 4.5V. is that ...
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1answer
91 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
72 views

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

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
105 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
51 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 ...
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1answer
157 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 ...