Questions tagged [boost]

A non-isolated DC/DC converter topology.

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1answer
254 views

Excessive Boost Converter Output

I'm implementing a boost switching regulator based on a Texas LM5002 chip (datasheet), to get about 65V from a 12V supply. The design I've arrived at is shown below, inspired both from the data on the ...
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0answers
67 views

Should I drive control lines of an IC at voltages higher than VCC

I am designing a circuit that will be running from a single cell LiPo battery. The battery will provide the input voltage to a boost converter that will output 5V, which will power a microcontroller. ...
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1answer
4k views

Filter noise from a high voltage DC-DC converter

After finding a couple of triodes lying around I decided to build a valve preamp. I've built a simple boost converter based on a 555 timer to generate anode voltage. The circuit is powered from a 9V ...
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0answers
3k views

Step Up DC DC [12 to 300] using MAX1771 Chip

I am trying to build my first circuit following the information posted here 12v to 300v Boost Converter - Ideal Inductor for 9kOhm load I tried to answer there before opening this new topic,but I need ...
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1answer
746 views

Battery power to 5v led strip and 3.3v controller

I'm trying to build a wireless led strip using the esp8266 controller and ws2812 addressable led strip using battery power, but I'm a bit stuck on how to build the circuit. After a bit of research I'...
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0answers
347 views

Which current ripple equation should I use? (Boost converter)

I am designing a boost converter for a microgrid as an university project. It is supposed to interface a 2.4kW 120V solar array (using MPPT) with a 380V DC bus. There will be other sources and loads ...
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2answers
219 views

Trying to build a circuit to boost 5 V DC to 250 V DC with fairly low current output

I am fairly inexperienced with electronics, but I am trying to build a 250 V DC supply from a 5V source. From research, I have run across charge pumps and boost converters. I tried using charge pumps, ...
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4answers
31k views

555 timer boost converter doesn't meet spec

I've been messing around with nixie tubes lately which requires a high voltage source (~150V-200V) to turn on. I searched around for a simple high voltage generator and found this circuit which uses ...
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2answers
7k views

Regulated Joule Thief: why it works?

Please explain to me why this circuit can give me a regulated 5V? I understand the Joule Thief part, but why the regulator part work? simulate this circuit – Schematic created using CircuitLab ...
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1answer
1k views

Arduino controlled boost converter

If I was to build a 12->65V boost converter using Texas's LM5002 regulator IC, would it be possible to tie an Arduino I/O pin directly to the EN pin to enable/disable the output, while keeping the 12V ...
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2answers
1k views

Boost converter as high-side MOSFET driver

I have a circuit where microcontroller drives a H-bridge which is powered from 12V. I am having a problem with driving the high-side MOSFETs. I will be turning the H-bridge on/off only couple of times ...
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2answers
1k views

LTC3355 backup DC/DC regulator output voltage sags under load in boost mode

Background For a hobby project, I have designed a board using the LTC3355 DC/DC regulator to work as a power supply. I am a software engineer by trade, and I am thus totally underequipped to properly ...
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2answers
214 views

DC-DC converter topology

Is it possible to build a DC-DC converter by means of a piezo crystal followed by a voltage multiplier? The crystal would supply the AC voltage needed by the voltage multiplier. I'm looking to get ...
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3answers
741 views

What is the minimum supply voltage for the MC34063E in step-up (boost) configuration?

I need help determining the minimum supply voltage specification for the MC34063E in step-up (boost) configuration. I can't tell for sure by reading this datasheet. First, on page 1 they say: ...
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1answer
680 views

Using LM2577 boost converter to charge the 2S lithium ion battery with an input of 15W at 5V

I am trying to design a Lithium ion battery charger that can charge a 2S battery. The input power will be 15W at 5V. I am thinking of using LM2577 boost converter to efficiently step the input up to ...
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1answer
2k views

How to avoid voltage drop on undervoltage protection circuit?

I'm having trouble with a circuit I designed and I'm hoping someone here may help me fix it. I've successfully used the circuit below a few times. It was proposed by Russel McMahon in this answer. It ...
0
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1answer
118 views

Resistor programming of a boost converter, check my understanding?

I'm looking at the datasheet for a TPS6103 boost converter, and trying to figure out how to configure it for 5V 1A output. The datasheet is not making this easy to understand. Datasheet: http://www....
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4answers
1k views

Winding my own inductor-resistance

I am building a boost converter 12VDC-24VDC with output current of \$I_{out}=250\:\mathrm{mA}\$ and input current of around \$I_{in}=600\:\mathrm{mA}\$ and need to design an inductor for it. I've ...
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3answers
2k views

Boost Converter Problems

I'm having trouble with a boost converter I made: it outputs 1.2V with no load and 2.4 with one. I expect to draw 0.25 Amps MAX with Roughly 0.2 Amps continuous. My battery pack is 2P2S NiMH with the ...
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1answer
2k views

Boost with mc34063

I'm trying to get 19V / 3.5A supply From 12V battey, I made a boost converter circuit using mc34063 ic, The simulation of the circuit was perfect and I got 19V/3.7A as output, This is my circuit But ...
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1answer
457 views

Boost 5V to 18V: charge pump + LDO or conventional boost converter?

I am trying to build a H-bridge driver using discrete parts. Now I have a problem regarding generating the 10+V gate voltage for the NMOSFETs I used. The H-bridge and its controls is like this: ...
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2answers
1k views

Boost converter simulation keeps getting fried

In my project I want to use a couple of old russian VFDs. To drive them, I need 28V from a 12V power supply. The plan is to use a DC-DC boost converter as calculated here and here. I've ported the ...
2
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1answer
907 views

P-Channel Mosfet + Step-up Converter + MPPT Charger

I am constructing a circuit consisting of five parts: A 400mAH 3.7V LiPo Supply Battery A [P-channel MOSFET](DigiKey FDN360PCT-ND) A 2.5-9v Boost Converter An [LT3652 Solar Charger IC](Digikey ...
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2answers
355 views

How can I make any basic boost converter that actually works?

I have spent probably around 8 hours working on this today, and I cannot make any progress. I'm trying to use the TI MC33063A in a boost converter circuit, just to make a proof of concept. Right now ...
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2answers
1k views

Inverting charge pump with boost converter loading characteristics

I've added a test inverting charge pump to an LMR64010 based boost regulator. This regulator outputs +12V (exact value is 11.88V) from a 7.4V battery pack. This is a notated image from a Maxim ...
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2answers
244 views

Two-phase boost converter output capacitor selection

I am designing a boost converter for my board. Here I am planning to have a smaller capacitance at the output. So I am using the IC from linear technologies ie. LTC3787. This can be configured as two-...
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1answer
361 views

Is it safe to parallel connect components to a single to a 12v DC PSU?

Prerequisite: For a home-decor project, we wish to work with different LED strips and even a larger LED chip as a central lighting source by attaching everything to a powerful, high quality 12v CC/CV ...
2
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1answer
2k views

AC-DC voltage doubler rectifier

I designed a 50 Watt voltage doubler rectifier with rated input 12 VAC and output 48 VDC. The circuit configuration and simulation result are presented in figure below. 2 unit IRFP460 power MOSFET ...
0
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1answer
709 views

Maximum current draw from a step-up regulated output

I have a LiPo battery pack with 5V, 2.1A output. Now, let's say I boosted that with a step-up regulator like this Pololu module. At 12V output from the regulator, what is the maximum current I can ...
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1answer
793 views

Inverting buck-boost vs. positive buck-boost

Should I use an inverting buck-boost or a positive buck-boost topology? Input voltage range = 19-22VDC, Output voltage range = 10-56VDC, Application = LED driver The app not I have says the ...
2
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2answers
551 views

Best way to power a 3.3V circuit from 3.3V-to-5.0V source

I'm working on an add-on board that needs 3.3V power (~500mA) and should take power from its host board. The host can operate at 3.3V or 5V and I'd like to avoid using jumpers that would require the ...
2
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4answers
8k views

Can 2 boost converters outputs be put in parallel at the same voltage?

I have a slight doubt here. Can the outputs of 2 boost converters set to output the "same" voltage (isolated, they would never be exactly the same obviously) be safely tied together, as long as there ...
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2answers
6k views

LM2596 inverting mode to generate -5v

I am trying to use an LM2596-adjustable to make an inverting Buck-Boost power supply as per below: The circuit requires a voltage divider that is used to adjust the output voltage. In the diagram, ...
7
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2answers
970 views

Can I build a high-frequency SMPS choke out of an arbitrary coil of wire?

Suppose I want to build a boost converter that runs at 100 kHz, with an input voltage of 600VDC and an input current of 100 amps. (This is hypothetical, I know the semiconductors involved would be ...
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1answer
119 views

Buck and Boost drivers for LED

Many of the newer bike lights use LEDs. Although I understand basic electronics it has been some years since I learned electronic theory. Although I understand the basics of buck and boost drivers I ...
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2answers
1k views

Questions concerning Solar MPPT tracker

I am building a solar MPPT tracker. First of all: what I understood from MPPT is that MPPT units transfer the maximum power available from a solar panel at that time to the load. This can be done by ...
0
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1answer
40 views

What is the name of the IC that runs a low-harmonic power supply?

I'm interested in building an AC/DC converter for low-harmonic applications. Single-phase AC input, followed by a rectifier and a PWM-controlled boost converter. I know there are ICs which are ...
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5answers
19k views

Boost Converter Efficiency goes down as Duty Cycle goes up?

simulate this circuit – Schematic created using CircuitLab I have tested a boost converter under different duty cycles. I know the voltage is related to the input voltage by V = Vin/(1-D) where ...
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2answers
2k views

Inverting (Buck-boost) converter polarity problem

I have trouble understanding something in the circuit below. It is inverting converter, seems quite easy, but the part I don't get is when the switch is OFF we have forward-biased diode, i.e. plus on ...
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3answers
500 views

Boost regulator from 3V to 14V; then two LDO to make a +5/-5 power supply?

I am designing a mixed signal circuit and I need +5/-5 dual supply for my opamps. Could the following configuration work, else what are my alternatives? ...
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1answer
198 views

best way to adjust/set SMPS comp / compensation parts

I’m having difficulties with settings the right values for the comb / compensation for some SMPS circuits I’m working one. Is there a good way to set them right? To make sure of stable operation in ...
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1answer
977 views

Slow start up of LM3578

Hello all, I have this circuit which will take an input (4x1.5AA (3.5V~6.2V)) and output a boosted voltage of 12V (120mA). The problem I am facing is that the voltage takes about 10s. to build up from ...
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2answers
666 views

Latching Solenoid Drive Voltage Problem

I have a circuit which drives a latching selonoid valve(valve changes state for every 50ms pulse) Below there is an easy go schematic of the circuit. Basically a 3.7V LiPo Battery supplies for 3.3V ...
2
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3answers
2k views

How to actuate 24V solenoids from 3.6V batteries

I want to build a battery-powered device that actuates a 24 V solenoid when a button is pressed. How could I power it from a 18650-sized lithium-ion cell? It should work down to about 3 V, when it's ...
1
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1answer
244 views

Oscillation on an 4 phase 12 to 24V 20A boost inverter

Oscillation on an 4 phase 12 to 24V 20A boost inverter I’m using 2 pieces of LTC3787 to make a 12-24V inverter. I made a 4 layer board from it to have enough ground to make sure all will be stabile. ...
0
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1answer
198 views

How to regen a DC motor from the high-side of a boost converter?

I am planning to drive a 24v motor from a 12v battery, using a DC-DC boost circuit to generate the 24v and an H-bridge to PWM drive the motor. A problem arises when the motor goes into the regen ...
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4answers
546 views

How do I average a complex waveform?

I am trying to figure out how long my project will last on a single battery. It's powered by a single AA battery with an NCP1402 3.3 volt boost converter. I've determined that the target circuit draws ...
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5answers
5k views

Solar panel and dc motor

I want to run a 130V dc motor 2hp. I have 6 solar panel 120V dc out. I connected them in series to the motor directly and it runs, but when I check the voltage at the terminal when it is running it ...
3
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1answer
387 views

Transistor Level Shifting in Buck-Boost Converter

Ive been reading some of the LT application notes on Jim William's Analog Circuit Design book, and there's something I don't quite understand. I'm attaching a scan of the circuit in question. The ...
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2answers
252 views

Boost /step up converter efficient and very small for high current ? (with example)

Here you have a view of the external battery of Energizer (XP18000A) of 18 000 mAh. Energizer allows DC 19V, 3.5A in output : 19*3.5 = 67W There are 2 batteries, so 2*3.7 = 7.4V then batteries allow ...