Questions tagged [boost]

A non-isolated DC/DC converter topology.

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2answers
446 views

synchronous rectifier control chips for half-bridge

I'm looking for synchronous rectifier control chips for use in a boost converter, but all the chips I've seen so far sit behind transformers in the application circuits (for example, as shown here: ...
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3answers
1k views

Is this a bidirectional buck/boost converter

I found this interesting IC on Linear Technologies site, but I don't understand if it, or its development board, can both boost input voltage to output and buck output voltage back to input. http://...
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1answer
379 views

Solar Powered MintyBoost

I've decided to try and make a Solar Powered MintyBoost. I've drawn up a very rough version of a schematic: As you can see, I plan to use a solar cell to charge a set of 2 D batteries (in series), ...
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2answers
880 views

Switching regulator layout advice

I am planning to use a Diodes AP5100 switching regulator to go from ~22V to 12V in my circuit, which will have a max current draw of about 1A. This is my first attempt at laying out a switching power ...
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2answers
2k views

Routing a buck/boost DC/DC converter

I need some help with the layout of a power supply. I botched the first two iterations as I do not have the necessary experience, and I would like to avoid another costly run. For the sake of ...
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1answer
2k views

Noise problem with buck/boost switching regulator

I am designing a electrical device for a research project (I'm a PhD student, but unfortunately not EE!). More info on the device can be found at http://iridia.ulb.ac.be/supp/IridiaSupp2012-002/ The ...
2
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1answer
471 views

Driving LEDs with Specific drivers or buck/boost regulation

I have a circuit that is driving 3 x LED rings and an Arduino/ATmega @ 5v through a standard 5v regulator. Each LED ring draws 11v @ 300mA and is PwM switched using a 2n7000 Mosfet from the ATmega's ...
2
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1answer
8k views

12v to 300v Boost Converter - Ideal Inductor for 9kOhm load

I'm currently working with a MAX1771 chip, the design can maintain a stable voltage up to around 15kOhm and is as follows: 12V to 300V DC-DC Boost : Disregard NMOS and DIDODE Value The inductor ...
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4answers
1k views

What actually is the output current of a boost conveter?

What I understood at least at a basic level the operation boost converter, the inductor supplies output current when the switch is OFF. When the switch is ON the the load current is taken current ...
4
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1answer
2k views

Switching Boost Converter only works while probing with o'scope?

/See Edit below/: Why was the collector drive current not sufficient? I'm trying to improve a 4S LiPo (14.4V nominal) to 19V/3.5A boost converter based on the MC34063 PWM switch controller. I ...
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1answer
2k views

Boosting a Lithium Coin Cell

I made a board recently and just started checking it out yesterday. I used a typical lithium coin cell and a boost converter (Microchip MCP1640). With a battery plugged in I get no voltage out of the ...
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2answers
466 views

Boost converter to 5V

I'm searching for a boost converter to convert up small voltage (min 0.5V / max 81mA) to 5V. (the smaller the better) Can you recommend a special type number?
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2answers
1k views

Does this use of IR2183 as high-side n-channel gate driver work?

I'm building a switching power supply taking 12V to 19V at 3A max out. I've already built one of these using a Schottky diode for the rectifier, but this time I'm thinking of trying a high-side-...
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4answers
17k views

Charging a circuit to around 10kV from 3V (two AA batteries) for discharge over 20msec

How can I design a circuit that can be charged to around 10kV (somewhere between 5 and 20kV is fine) from two AA batteries (~3V)? I am going to draw about 20mA over a high resistance load for a short ...
3
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1answer
101 views

Effect of switching noise on a handheld measurement device

I'm planning to make a handheld LCR meter (plus more) based on Cypress's PSoC 5LP chips. One of their many features is a built in boost converter, which seems an attractive prospect, since it would ...
10
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1answer
7k views

Joule Thief - operation and the 'supercharged' version

I've made a joule thief, and it works fairly well, but not as well as I would like. It's powering a 3.2v LED from a 1.2v battery, but it's very dim. I'm hoping increasing the voltage from the JT ...
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3answers
705 views

Op amp picks up power rail oscillations from boost conveter

I've built a circuit which detects ambient audio through an electret microphone, amplifies the audio signal using a LM386 op amp (gain = 200), and then processes that audio information. The board is ...
2
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1answer
5k views

How does one compute the ripple currents seen by a boost converter output capacitor?

Suppose one is designing a boost converter, with a known maximum current load, and a known inductance: The ripple current seen by the output capacitor is critical. If that current is too high, the ...
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2answers
197 views

Decreasing voltage without decreasing the current

I have got two 12 V 7.2 Ah lead-Acid batteries, which are connected in Series (26 V after charging). The batteries are connected to a step-up / boost module which have to be 2 V higher than the input. ...
6
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4answers
14k views

Options for getting 3.3v @ 220mA from small batteries

I have a system running at 3.3v requiring 70mA at most times and 220mA at peaks (roughly 20% of the time). I'd like to find a way to power this from coin cell batteries or other small portable source. ...
23
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3answers
9k views

Why should I worry about a motor causing my supply voltage to shoot up when the back-EMF can't exceed the supply voltage?

I have heard people say that in motor control circuits, one must take precautions to keep the motor from feeding back into the power supply, causing the supply voltage to rise, consequently breaking ...
7
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1answer
4k views

In a boost converter, should ground plane be placed underneath the gate trace?

When designing the PCB layout for a DC-DC boost converter, one does not place a ground plane under the inductor, to prevent induced ground currents. Also, for SMD MOSFETs, the drain (switch node) ...
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3answers
9k views

Looking for a quick and easy way to boost +5VDC to +24VDC

I am looking for a simple IC solution how to boost +5VDC to +24VDC 1A. Requirements: THT (the project is on a 2.54mm(0.1") experimental breadboard) low-cost (this is a hobby project, so arround ...
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3answers
4k views

5V DC Voltage stabilizer circuit

I need a circuit or preferable a ic that have a stable output of 5VDC. Input range may vary between 4 - 5.5V. I want to "drive" a Vref on a ADC. The operating voltage for this ADC can be 2.7 - 5.5V, ...
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2answers
12k views

Bi-Directional Buck Boost Converter

I'm trying to build a Bi-Directional buck-boost converter. The input should be between 9-12 and output should be 12. Can any one recommend a good topology to follow. I also have a few conceptual ...
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3answers
3k views

How to make MC34063A work as a step-up converter with 2.1V input?

According to Page 7, Table 8 in the datasheet for MC34063, the startup voltage is 2.1V typical for A series and 1.5V typical for E series. It is also said in Note 4 that the start-up voltage is the ...
4
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1answer
2k views

High-pitched noise from boost converter. Need your help

I'm experiencing some high-pitched squealing noise from my boost converter, I'm getting some resonating frequency when I start increasing the load current.The inductor is a 47uH inductor. The part ...
9
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2answers
7k views

What effect does switching frequency have on a switching booster circuit?

In what cases/application is a high switching frequency desired and vice-versa? I'm trying to choose a DC-DC booster IC and I don't quite know how the switching frequency will affect the circuit. Only ...
4
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1answer
6k views

boosting 3.7V to 12V

What would be the best way for me to boost 3.7V to 12V with 300ma max draw? I've been looking at this: LT1303 and this MC34063A. I actually bought an lt1303 last week but I couldn't get anymore ...
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1answer
541 views

high voltage Buck-Boost converter

I am looking for a Buck-Boost converter design that can take an input of 85 or 90 vrms to 265 Vrms. I would like the output to be in the range of 112-115V (DC) and current at least 150mA (dc). The ...
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4answers
15k views

Why is my simple boost converter giving me such a high peak output voltage?

I am trying to understand switch-mode power supply fundamentals through a simulation in LTSpice. I wanted to build an excruciatingly simple boost converter circuit following a teaching model often ...
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3answers
303 views

Regulating Voltage

I want to rectify my input voltage from AC to DC in the range of 90 vin min to 270 vin max. I was thinking about a buck converter design due to the efficiency however I cannot find one that can take ...
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1answer
2k views

DC-DC Boost Converter 12V .5A Output, 3.6V, 2A input

This is an update to a previous post about a circuit for a 6W LED. I've decided to add a boost converter in order to be able to power the LED. I used TI's SwitcherPro Design tool and based it off ...
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2answers
357 views

“31WOC” on a boost converter, but what datasheet goes with it?

Long shot, I know... I have this Boost convert 1-5V in out 5.1-5.2V and I hope to modify it for a different output voltage. So I'm trying to identify and find the datasheet for the main chip. I ...
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3answers
2k views

Improve RF range with a boost converter?

This might be a stupid idea, but I will try anyways: I have a RF 433MHz TX module (datasheet) which can be supplied with 1.5V...12V. My understanding is the range increases with higher voltage as the ...
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2answers
1k views

Trying to simulate a PWM model of a boost converter in gnucap

There's a paper called "Simplified Analysis of PWM Converters Using Model of PWM Switch (part 1)" by Vatché Vorpérian which introduces a "PWM switch" to model the switch and diode in a switching ...
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5answers
6k views

How to power a GSM Modem from a Li-Po battery?

I want to integrate an AirPrime SL6087 GSM modem into a design, this is my first try at working with a GSM module. The datasheet states that the modem draws 2A for 1mS every 4mS (max) at 3.6V, the ...
2
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3answers
4k views

How to adjust the voltage of this SMPS?

I bought this kind of module for my led light project. Unfortunately it did not come with instructions. It can be found from eBay with "3.5-28V to 1.25-26V DC-DC Converter Boost Buck Step Up Step ...
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4answers
1k views

Pumping a few amperes for 100 µsec

I would like to pump 4-5 A to a high-power LED for 100 µs. My system has only a 3.3 V battery, and this 100 µs high-power event takes place once every 10 seconds. What is the ...
7
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3answers
13k views

5V to 160V DC converter

I need a DC-DC convertor to bring a 5V input up to 160V DC output. Does anybody know off any of the shelf parts that would manage this? The high output needs to supply minimal current (uA) we really ...
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1answer
2k views

48VDC SLA charger from 12VDC supply design help

I am in the process of designing a 48 VDC (comprised of 4 x 12 VDC) lead-acid battery charger, with an input voltage of 12 VDC. 1W - 2W output is sufficient, and relatively high efficiency with low ...
0
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1answer
1k views

How might I wire a split pi converter to transistors as to maximize output voltage?

I was looking into various dc-dc converter designs, and I was interested in the split pi converter. As a start, I just want to maximize the output voltage. I know in theory, the output voltage could ...
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2answers
524 views

Accepting a Range of Input Voltage that Straddles Operating Voltage

I want to design a system that runs at 5V and about 350mA. I want that system to accept an input voltage between 1.8V and 15V. How can I achieve that goal with a minimum component cost in my input ...
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2answers
796 views

How do I supply a short but high power pulse (higher voltage and current) from a low power source?

I'd like to be able to throw a relay and solenoid from an AVR. For this project, I'll occasionally need 12-36V for maybe 250ms. I found someone having done something very similar using the following ...
27
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7answers
27k views

Least expensive way to boost DC voltage

What would be the least expensive way to boost a DC voltage? The aim is to convert 1.2 V/1.5 V (from an AA/AAA cell) to 3.3 V to power a small 8-bit microprocessor, like Atmel ...
1
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2answers
1k views

Boost Converter for TTL circuits to drive large loads

I've got a small PIC-based TTL circuit device, powered by a 4.5V coin cell, that needs to drive a solenoid which requires 12V. Obviously my logic level device can't directly power that so I could ...
6
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3answers
4k views

Best way to produce 50 VDC, 20 mA from 5 V

Ok, so I need to generate 50 V from 5 V, with a load of 0 to 20 mA, for a mass-produced device. There are simple boost converter circuits like this LT3467 example: but it seems these are limited by ...
7
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5answers
8k views

How do I improve efficiency of a boost converter?

I have built a 3V to 5V boost converter with discrete components. L = 220uH Vf(Diode) = 0.25V ZVN4210A MOSFET C = 470uF f = 47KHz My load is a microcontroller board (M16C QSK62P Plus) that takes ...
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4answers
3k views

Short circuit protection for a boost converter

Is it possible to add short circuit protection to a boost converter? My initial instinct was no, as the switch does not directly control the input to the inductor and this means the minimum output is ...

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