Questions tagged [boost]

A non-isolated DC/DC converter topology.

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3answers
605 views

BOOST converter layout check

He everybody. I've already done my firts PCB project. I did draw Boost converter and I have a few quenstions about my layout. How is my layout? Can I improve my layout and placement? If you check and ...
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2answers
3k views

DC/DC boost converter voltage drop when connected to load

For my senior design project, I am trying to generate two voltage levels or rails from a battery powered circuit (12 V and 3.3 V.) I am using an adjustable boost converter for the 12V rail and a ...
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1answer
9k views

How does this 4-transistor DC-DC 1.5V to 9V boost converter work?

While searching for DC-DC boost converters to replace 6F22 9V batteries by 2 NiMH rechargeable AAs for my cheap multimeters, I came across this circuit: The circuit was posted by Popescu Marian at ...
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1answer
2k views

Effect of load resistance on inductor current for a boost converter?

Is it the same as buck converter? when a decrease in load resistance , more current will flow through the inductor
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3answers
1k views

What would cause a buck-boost regulator to buzz loudly and generate high voltage ripple during certain input voltages?

I've got a buck-boost power supply design based on the LM5118 by TI. A schematic of the device is shown below: (Link to TI Workbench) EDIT Many of the comments mention the layout, hence I've ...
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1answer
868 views

Multiple Input supply switching

I'm looking into designing a power supply for an RPi that can take both USB and battery at the same time, but only pull power from one of the sources. I'm not quite sure how to go about it, I was ...
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2answers
10k views

What is the effect of switching frequency on output voltage ripple and inductor current for DC-DC converter (boost and buck)

What is the effect? Is there any article or lecture note for me on this? and I would like one more question what is the effect of load resistance has on inductor current on DC-DC converter?
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2answers
3k views

What effect does switching frequency have on DC-DC boost converter voltage gain?

Does the voltage gain follow linear relationship for boost converter? And when you change the switching frequency , does the voltage gain still follow linear relationship ?
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1answer
153 views

Problem in a boost calculator circuit

In order to get an output of 100V-300v (for the ultrasound piezo drive ) from a 3.3V output of the microcontroller. I have built the boost circuit according to this circuit: But there is one point ...
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1answer
147 views

When a load draws more current than a source can give

I'm planning to use the LM2623 to boost a single AA for a 5V load that draws 400mA. This graph seems useful The graph seems to suggest that at Vin=1.5V, there's no way 400mA could be drawn without a ...
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1answer
56 views

Is it safe to boost output voltage to the maximum limit?

I'm going to be using the MCP1640 for boosting one AA battery to 5.5V. However, its max output voltage is 5.5V. Will it be safe to boost the output to the maximum limit and not cause damage to the ...
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0answers
148 views

Influence the apparent input resistance of a buck-boost converter

I want to power a buck-boost regulator (for simplification, preferrably one of the integrated circuits from Linear Technology) with a current-limited or high inner resistance power supply. The power ...
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1answer
588 views

Buck-Boost converter controller design

I am trying to design a four mode buck boost converter based on the LTC3789 controller such that I want to completely substitute all the PLL functions, clock and everything else internal to it so ...
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2answers
231 views

Why don't LiPo charger chips isolate the output during shutdown?

From what I've gathered, boost regulators from MCP1640 to TPS61090 disconnect the load during shutdown so that the battery is not drained during shutdown. However, charger chips like BQ24295 don't ...
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2answers
1k views

What is the maximum power an inductor can transfer in a SMPS?

I'm trying to analyze a boost converter circuit. I have all the specs for the inductor used, including inductance (6.8uH) and saturation current (1A). This runs from a 3V supply. I'm wondering if ...
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1answer
578 views

DC-DC SPMS Boost Converter DCM Prevention

Sorry for the long question, it's really opinions I seek which is why I felt I needed to explain the scenario and how much I know/don't know. I would really like some input on my design. I am ...
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2answers
1k views

Boost converter design help

I need help on a 12v-220v Boost converter design. the converter is to have a feedback system that keeps the output voltage steady even when the input voltage drops. I have done a lot of reading and ...
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1answer
225 views

TPS40211 PWM LED driver topology

I've recently been trying to figure out an LED driver circuit for my 32V, 0.7A CoB emitter. I settled on the TPS40211, since it ticked all the boxed in terms of input voltage range, output, etc. I ...
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1answer
140 views

How to interpret step-up output current with respect to input/output voltage

I have a Pololu 12V step-up converter (U3V12F12) that I'm powering with a 3.7V 6600mAh lipo battery. The idea was to use it to power a dev board that requires a 12V input. The dev board draws about ...
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1answer
234 views

LED array at high current or high voltage?

Is it more efficient to drive LEDs at a high current and low voltage, than a lower current and high voltage? I'm in a situation where I have to design an LED driver for a custom CoB emitter, so can ...
2
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1answer
116 views

How to shutdown the entire system after certain time period?

Background I have TPS61240 Boost converter module. In my system, TPS61240 is used to convert 3V DC to 5V DC. This 5V supply is then used to power whole system. Moreover micro controller driven system ...
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1answer
3k views

Overheating Boost Converter

I have designed a board that uses the MIC2251 (SOT-23 package) boost converter to boost 5v from a USB charger to 10v, to power some 2 series LiPo chargers. http://docs-europe.electrocomponents.com/...
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0answers
159 views

boost and flyback converter

I am currently analysing this circuit But I ran into some problem since the boost component standalone raises the voltage to 40v the flyback is suppose to bring up the voltage to a further 540v ...
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1answer
192 views

Increasing 12V Rail current on power supply for mobile computing

I am building a miro-itx slimline pc for my mobile home that is powered by solar. I have selected a GPU with a rated TDP of 120 Watts and a CPU with a TDP of 53 Watts.I purchased a DC-DC buck ...
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1answer
381 views

convert 5volts to 6.5volts with simplest circuit [closed]

i need to convert 5 volts to 6.5 volts. i also need the circuit to be as simple as possible using the least amount of components. eg.like using single resistor or capacitor the 5 voltage supply will ...
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2answers
115 views

Use a li-ion battery at two different voltages

I scavenged a li-ion battery from a broken laptop. It is made of 6 Samsung ICR18650 cells (3.75V 2800mAh), parallels two by two so that the total pack is in fact the sum of 3 cells at 3.75V, so 11.25V ...
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1answer
296 views

current density value for inductor used in boost converter

I am designing boost converter. I need to select inductor for the same. As a new bee i don't know the criteria for selecting the same. (1)what is the maximum current density of copper bare wire for ...
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3answers
6k views

Basic power: drive 12v LED from 5v Raspberry Pi output — no 12v supply available

There are a lot of questions on here and elsewhere about this. The consensus seems to be to use a transistor to switch a power supply — implying that I have a 12v supply available. Only 5V is ...
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1answer
1k views

Boost converter with 2A load

I'm trying to put together a boost converter to take a 11-14.4v input and boost it to ~17v with a max current of 2A. Most of my designs (made either by calculations done by me or a calculator tool ...
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2answers
263 views

TPS61240 Boost converter IC is not working at all?

I am currently using TPS61240 as a boost converter for my project. As i did not have any sample previously so there was no way I could test it. I ordered the IC and placed it on my final PCB directly. ...
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1answer
1k views

What does Boost Converter With 2-A Switch mean?

I am new to boost converter technology. All i want to know is what does switch current indicate.
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1answer
306 views

Programming undervoltage lockout in Boost(Step up) converter

Requirement is to convert 3 V (1.5 x 2 alkaline batteries) dc voltage to 5 V Dc voltage. I know battery voltage decrease with the use and i am required to set a threshold voltage so that if battery ...
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1answer
686 views

DC voltage source connected to an inductor is a current source?

I was reading about voltage boost converter, where the DC voltage source in series with the inductor is mentioned as a current source. Why is this? Also, an inductor in series with a load resistor is ...
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2answers
3k views

Is it better to boost or buck?

I'm making a solder fume extractor from an old PC fan (4-pin PWM), driven by a mid-range PIC. The fan needs 12V @ max 0.28A for power and a 5V PWM @ max 5mA to control the RPM. So I'll be running the ...
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1answer
668 views

Boost with LDO?

I'm working on a project that requires 3.3V from a pair of double AAs. I had thought that LDOs were always buck and if you needed boost you had to use a switching regulator. While doing some ...
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4answers
2k views

Proper Way of Powering a Circuit with 2 AA Batteries [closed]

That is a real primitive question. a) Many MCUs and SOCs are able to work @3V (-/+ 0.3V) b) This is voltage of 2 AA (or AAA) batteries And the real question is: What is the legitimate way to ...
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1answer
136 views

Summer camp project questions - bike charger

For a summer camp, I am building a bike-generator. Well I have found a few articles about that on the internet, but I have put together a list of questions and I would be really appreciated if someone ...
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1answer
471 views

Design and analysis of Two inductor boost converter [closed]

how to decide inductance values in case of two inductor boost converter?
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2answers
7k views

How to control a buck-boost converter circuit from a microcontroller?

I'm reading about buck-boost DC-DC converters lately and one thing is still not very clear for me. Most of the converter ICs that I've seen have a feedback loop input pin. For example LTC3780 requires ...
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1answer
435 views

boost converter load problem

I am designing a boost converter for wind turbin, with load 12Vdc, 2A. Before I install my boost converter on my windturbin, I putt a test to make sure it work properly. So I use this circuit to ...
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1answer
208 views

Boost converter high output impedance

At no load my boost converter will be the same as in the photo. I'm thinking without a load at the end of the boost circuit the output impedance will be very high which will make the potential ...
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1answer
506 views

Solar boost converter unstability

My design of a boost converter is the following Input: 40V/1.5A Output: 100v/0.62A Inductance used: 3.15mH Capacitance used: 220uF (rated 200V) diode switch used: IRF830 (rated Vds=500v) ...
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1answer
942 views

DC-to-DC voltage booster mosfet heat problem

I'm tying to understand boost and buck converter designs. Recently I made a prototype of a simple boost converter, used this as a reference. Used parts are as follows: Transistor - IRF3205 Diode - ...
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1answer
420 views

Solar Panel Boost converter (40v to 100V)

My project is to deliver the output of 200w solar panel (40v,1.5A)- very low because I am using lamps instead of the sun- to a load at a voltage level of 100v, after implementing the design of my ...
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2answers
1k views

DC to DC step-up boost converter compensation pin, what values to use?

Okay, so I decided on a DC to DC boost converter but am having some difficulty figuring out what values to use for the compensation pin capacitors and resistor. The data-sheet really does not go into ...
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1answer
3k views

3.7V to 9V DC to DC boost step-up converter design help!

I need serious help choosing an IC for my project. I need a step-up boost converter to power my device from a 1000mAh or 2000mAh lithium ion battery. So far I have measured that my device only draws ...
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1answer
135 views

Boost converter for PV

So my two PV panels giving me an output of 40v, 1.5A. I am sensing both current and voltage of the PV output to give an MPPT duty cycle pulse. I want to boost the 40VDC to at least 400VDC and ...
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1answer
790 views

Inductor for boost converter circuit

I'm using an AAT1217 for the boost converter in my circuit. The reference circuit I'm using is: The datasheet suggests several inductors: It suggests using these fairly large inductors, the ones ...
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2answers
500 views

How to boost (double voltage) a sawtooth generator

I have a circuit to drive, using a sawtooth generator, four varactor diodes (FC54). These varactor diodes has the following specs: from 2.5pF (at 15V) to 30pF (at 0V), but my sawtooth generator, based ...
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2answers
3k views

How to design a boost converter? And how to specify the inductor and capacitor values?

I want to design a boost converter with input of 48V and need to get to a voltage of 100V. How to select the inductor and capacitor values in it?

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