Questions tagged [dc-dc-converter]

DC-DC conversion. Implies conversion of a DC voltage level up or down. DC-DC converter can be isolated or non-isolated. Electronically it can be done by many kinds of circuits, depending upon the application (charge pumps, voltage multipliers, linear voltage regulators, boost/buck switched converters, etc)

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How can I protect a MOSFET from high voltage spikes in a DCDC converter?

I built DCDC converter using TL494 that is able to step down 30-200V to 12V with reasonable output. The circuit worked fine for quite a while, but I have always tested it while slowly raising the ...
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Powering multiple loads at same voltage with separated DC-DC converters

I'm working on the power distribution PCB of a battery powered robot with multiple loads at 24V, 12V and 5V. My idea is to use a big 24V converter, and then another two smaller converters to go from ...
Pablo Daniel's user avatar
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Recommendation for a DC- DC regulator IC with built in current limiting funtion [closed]

Following to the question, I am looking for an adjustable current regulator IC with current limiting function that is not very tiny and can be easily soldered with common tools. The specifications ...
Shamooooot's user avatar
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1 answer
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High side switching without bootstrap driver circuit [closed]

enter link description here This is the video for modifying buck converter at >5A as it delivers only upto 2A . Here, they are using nmos for amplifing current but For high side switching in n ...
parshuram mirjapur's user avatar
1 vote
4 answers
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How to charge a 2200uf capacitor to 59V in around 100ms from a 12V battery?

I need to charge a 2200 µF capacitor to 59 V in around 100 ms from a 12 V battery. This converter needs to be at most 35 mm wide. This requires the use of either a boost converter or a dc-dc flyback ...
Bob's user avatar
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Could DC-DC isolated power supply switching noise harm the input of an instrumentation preamplifier?

I am looking for a noiseless protection against 100ms pulse of 1kV of an input of ultralow noise instrumentation preamplifier (eight AD8428 connected in parallel, fixed gain of 2000) to measure very ...
NNN123's user avatar
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Current driven proportional solenoid EMC

I'm looking to control a solenoid like this one through up to 60 feet of cable. (PV3P12032A0) One chip I've looked at is the infineon TLE82453, although there are quite a few of this type from ...
Erik Friesen's user avatar
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Cuk Converter Average Model

I would like to create average model of Cuk converter but not getting any reference. Can anyone give any reference or some idea to start with? "Generally Cuk converter is 4th order but if we use ...
Power Path's user avatar
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2 answers
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Power Converter Average Modelling

This image is from Christophe Basso presentation. It has been mentioned in the slide that average model can predict the transient response but I have one question when we say average model then it ...
Power Path's user avatar
4 votes
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309 views

Parallel resistors with polarised capacitor

I have been trying to choose the input capacitors for an SMPS and have noticed resistors being used in parallel with the polarized capacitors. Since these designs are for an 800 V system, I am ...
Watermelon_13's user avatar
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How to add a current limit for a dual rails power supply?

I want to make an adjustable power supply with -18 V and 18 V separately adjustable outputs. I found this circuit might be the best and simplest one to do the job. How can I limit the output current ...
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DC/DC buck regulator regularly emits an audible clicking noise

Relevant TI forum post with no resolution: here. I am using an AOZ2264NQI-11 chip to convert 24 V down to 12 V. I originally designed this circuit for use with an AOZ2261NQI-12 chip, which has an ...
InBedded16's user avatar
-1 votes
1 answer
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Buck converter frequency lowers as load current rises (TI TLV62595)

I simulated a design in the TI Webench tool and I am wondering why the switching frequency falls to 1.2 MHz @ 4 A. Like, where is the point of 2 MHz @ 1 A, when peak current and voltage ripple is the ...
Google User's user avatar
2 votes
1 answer
76 views

two DC-DC converters to get split rail

I'm trying to design a circuit to power my DIY analog synthesizer. My requirements are: 9V DC input voltage (from a common 9V wall adapter) +/-15V output voltage able to supply about 500mA on +15V ...
Dimitri Petrucci's user avatar
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DC-DC Buck Converter high current, low quiescent current

I have an application where I'm trying to drive a 5 V 2 A load under control of a low-power microcontroller (MCU). I was looking for a buck converter with low quiescent current for the MCU (e.g. <...
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3 answers
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LM27313 boost converter failure

I am trying to assemble a boost converter using the LM27313 (datasheet link), following the reference design and calculations given in the data sheet. The load is 6 white LEDs (Vf=2.95V) in series. ...
defragmentedBarncat's user avatar
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Do solid state phased arrays need isolated power supplies?

Non-isolated DC/DC supplies could have higher power density but it seems that high power solid state phased arrays utilize mostly isolated DC/DC converters to power each of their amplifiers. Why are ...
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Parallel resistor across inductor practical model - switching converter [closed]

While designing switching converter, I have included the inductor practical model as shown in the image. Since Rvar2 is small value and in the order of milli-ohm. I see it is impacting my circuit ...
battu balaji's user avatar
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Why is there a difference between the model primary and physical primary in a forward converter, but not between the secondary or tertiary windings?

In a forward converter, the current through the physical primary winding is the sum of the current through the magnetizing inductor and the current through the model primary winding. However, the ...
elvishpotato's user avatar
2 votes
3 answers
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MP28167-A DC-DC converter recommends a resistor T-network in feedback loop

I am designing a DC-DC buck-boost converter using the MP28167-A, and the datasheet contains this section: I understand the need for a resistor divider such that the closed-loop control regulates the ...
TianCilliers's user avatar
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What is the relationship between the windings in a forward converter?

I'm trying to sketch the currents through each transformer winding of a forward converter. I also need to sketch the current through the source. I have a sketch of the current through the magnetizing ...
elvishpotato's user avatar
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2 answers
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DC-DC regulator power inductor alternatives

I am using Texas Instruments Webench power designer to create Dc-DC regulator circuit. Input should be 5-12 V and output should be 5 V 3 A. I am trying to look for cheapest design. Most of generated ...
Dominykas's user avatar
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1 answer
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Buck converter inductor waveform having high ripple and slow charging and fast discharging [closed]

The following shows the voltage (green) and current waveform (yellow) across an inductor in a buck converter designed to step down 30 V to 15 V with 0.2 A output current. The inductor values according ...
Aman Hari Kumar's user avatar
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Should I put my buck-converters in parallel or series?

I'm supposed to have two voltages coming out of two buck converters. My starting voltage is 12 V while the buck converters are supposed to output 5 V and 3.3 V respectfully. Should I make the output ...
Hubert's user avatar
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Conversion from 600 Vdc to low voltage. Easy unregulated solution?

On the new revision of our robot, we might switch to 600 Vdc motors (and therefore 600 Vdc supply voltage). The problem is generating the low voltage rails (mainly 24 V and 48 V) for the internal ...
Sandro's user avatar
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LT1683 output dropping and compensation

I've done the design using the datasheet of the lt1683 however from the simulation whenever I provide a step input to the load it drops more than I'd like from ~18V to ~16V. The input to the converter ...
con3's user avatar
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1 answer
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How to tweak tp4056 module to run on 8v?

I have a tp4056 module: How can I tweak it to run on 4v to 8v range (it's maximum voltage rating according to the datasheet). datasheet
Shamooooot's user avatar
1 vote
1 answer
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Transformer design and calculations

I am trying to find correct way of determining the transformer parameters. I provided a simple schematic of a PSFB (phase-shifted full bridge) converter below. How do we determine thr primary ...
Mhan's user avatar
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What's the best method to design an adjustable power supply with 0-240V output? [closed]

I need to design a power supply for a DC shunt motor that has 240v,1.75A armature current, and 0.2A excitation current. I was wondering which is the easiest/reliable method to design the power supply, ...
Shamooooot's user avatar
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Best way to control large buck converter?

I am looking for a faster way to control output voltage for a buck converter. This buck converter has its own fet driver and I am not willing to change it. I really only need the signal to run the ...
2strokeforever's user avatar
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1 answer
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DC-DC buck converter inductor current

Draw a simple dc to dc buck converter fed with dc voltage of constant magnitude (= E). The converter supplies a resistive load (=R). Draw the shape of voltage waveform across the freewheeling diode. ...
Bhavya Puri's user avatar
2 votes
2 answers
118 views

How to extend up-time after power supply is gone

I just started to work on a small home project. I have an indoor bike that I use quite a lot. The resistance of the bike can be adjusted manually in a purely mechanical way (by tightening a screw). ...
Marcell Juhász's user avatar
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1 answer
179 views

What is the best and simplest way to generate multiple accurate reference voltages?

I need several reference DC voltages to use them to calibrate hundreds of circuit boards manufactured in our facility. The voltages to be calibrated are 5V 10V 100V 200V 500V The accuracy required ...
AlMoutaz Billah's user avatar
1 vote
3 answers
91 views

DC/DC step-down converters: what trade-offs prevent lower minimal input voltages?

I'm currently looking into isolated step-down DC/DC converters, to convert from high voltages (a few hundreds volts) to 24 V. I'm surprised that the minimum input voltage is often quite high (like 200 ...
Sandro's user avatar
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MT3608 is not switching for particular input voltage

I have PCB printed a board that feeds a 12V led strip from either a Li-ion battery or a 5V USB. With no load, the output is 12V, as it should. As soon as I connect the led strip (80mA at 12V), the ...
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How to understand MAX25431 datasheet on inductor selection?

I am trying to design a project featuring MAX25431 buck-boost converter. After examining the datasheet I started the part selection for my application, but I have troubles understanding few details: ...
vorobey's user avatar
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4 votes
1 answer
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Push-Pull DC converter - resonance in the waveform

I'm building 48v to 200v Push-Pull DC converter. And now I'm close to finishing the project, but when I checked the waveform on the transformer I discovered that it looks like this: (on this picture ...
darth taco tmp's user avatar
1 vote
2 answers
91 views

Core demagnetisation - What is the condition?

Consider forward converter topology. What is necessary for core to be successfully demagnetised? Does the magnetising current has to reach absolute zero amps, or even little negative is advantage? How ...
Michal Podmanický's user avatar
-1 votes
2 answers
88 views

Can a single buck converter be used for converting both 12V and 24V input to a constant 12V output DC to be fed into a 12V DC motor?

My target is to design a low-cost PCB to run a 12V DC motor. I do need to have 2 input sources, a 12VDC and a 24VDC. What is the best way to achieve this using a single board? Can I use a single buck ...
Adithi's user avatar
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DC-DC boost Converter for a motor load

To give some context I have a 250 watt DC motor It is powering an electric race car for a school race my class is competing in. The rules say I have to use a specific unmodified motor supplied by 2, ...
Ryan Northup's user avatar
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2 answers
119 views

How do DC/DC converters work as lithium battery chargers?

There's a lot of DIYs that utilize DC/DC converters to charge Lithium batteries. A quick Youtube search shows dozens of these DIYs. I was wondering how these home-made chargers work. Yes, DC/DC ...
GIZ's user avatar
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Microcontroller resets multiple times and eventually blows up in a boost converter application

I'm working on a high voltage (100V input, ~600V output) boost converter, and have decided to use an 8-bit Nuvoton MS51PC0AE microcontroller to control the output voltage (instead of using a PWM ...
Amrit Pal Singh's user avatar
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2 answers
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Bias start up circuit for half bridge converter

In this schematic (below) from the Texas Instruments UCC28250EVM-564 User's Guide (Controller for Half-Bridge DC-to-DC Converter With Secondary-Side Control), they use a bias winding. I understand ...
PosFLo's user avatar
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1 answer
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Not able to get enough current from buck boost (sepic) converter made using TL494

I am trying to build a buckboost converter for converting 5-40v input to 5-35V output at 3A max to use it for many purposes by usign TL494. I am using a SEPIC topology as i want a non inverting output....
Logesh-0304's user avatar
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Parellel configuration DCDC converter and 14 V battery

I have a converter which bucks a high voltage down to 14 [V] to power some low voltage electronics. However, there should also be a battery there which is crucial during the start-up procedure and can ...
Damien Keijzer's user avatar
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1 answer
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AP63203 Buck not working

Recently I have been experimenting with the AP63203, and I just have not been able to get it to output 3.3V successfully. Currently, the way I have been testing it is using an SMT to TH adapter, which ...
Лука's user avatar
4 votes
3 answers
2k views

How to design a 12V to <100mV 15A DC-DC converter?

My project requires a constant current source of at least 13A for a minimum of 1s (preferably capable of longer such as 5s). The primary use of this current is to produce a B-field. The current would ...
Kristen22423's user avatar
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1 answer
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Multiple DC/DC or single DC/DC + LDO

My FSAE team and I are developing the electronic boards for the car, like BSPD, TSAL, etc. So far, we use a 24V battery for low voltage system with a single DC/DC 24V to 5V converter for each board, ...
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2 votes
3 answers
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High voltage buck converter inductor voltage rating

We‘re designing a buck converter that should convert 600VDC down to 20V. For that purpose we use the ST VIPer26k. We’re currently looking for an inductor (L2). The inductance is 1mH, but we‘re not ...
Felix Kunz's user avatar
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DC/DC Buck Converter : Implementing Convenient Minor Alterations to Output Voltage

Question How can I perform precision minor output voltage adjustments when using a dc/dc voltage buck converter with high efficiency (including at light loads), without loss of efficiency and without ...
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