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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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2answers
76 views

Trouble with DC/DC (switching) converter

I have a DC/DC converter with +5V input and ±15V dual output to supply power to the analog portion of a board (just two operational amplifiers). The +5V DC input comes from an external box that uses ...
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74 views

Resistor annotated with a frequency

The LT3757 datasheet includes the following schematic: The resistor in the bottom left corner is annotated with a frequency (100kHz). What is the significance of that annotation?
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55 views

Looking for component/s to split 24v to all of 12v, 5v, 3.3v

I'm still learning and messing with electrical engineering so please keep answers easy to understand. I'm looking for a component or set of components that I can use to split a 24v power line into ...
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28 views

How to make a model for simulation of MT3608 in proteus

I have imported MT3608 from here (Aerosemi) to proteus, but I can't simulate as it's missing a model.
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1answer
22 views

Bad Waveform on Output of Buck Converter

I have designed a buck converter (poorly) and have been getting terrible noise. I made a post here where I was given suggestions on how to do a proper layout for my buck converter. This post also ...
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27 views

Error amplifier in PWM controller

Using the datasheet UC3842 PWM Controller I have modelled error amplifier in it. AC analysis of error amplifier matches with the datasheet plot(Figure 3) - Since I need to clamp the output ...
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26 views

EMI Filter - DC DC Converter No Differential Mode Filter Outlined

I am currently looking at installing a DC-DC Converter. https://www.xppower.com/Portals/0/pdfs/SF_QSB300.pdf The datasheet outlines a recommended EMI filter as so: My question is as the datasheet ...
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1answer
75 views

What is the easiest way to get a 50x DC-DC voltage increase?

I want to have a 3-4 kV DC output to feed a marx generator in which I am planning to use 4kV ceramic capacitors. I have 2 DC power supplies @ 30V 6A rates, so I can have at most 60V DC input by using ...
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45 views

Split rail DC/DC converter

The input voltage of my system is ±15V. I need to generate the ±5V voltage. As I need it to power precise analog components (ADC, op amps), my plan is to use DC/DC converter for reducing it to, lets ...
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90 views

how to increase output current (5V Output, 1.5V input Switch Boost Converter) [closed]

I designed a small boost converter with discrete transistors, and now I need to increase the output current. The output is 30ma/5V but I need more than 70ma. How can I improve the circuit? R5 is load....
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2answers
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Questions regarding DC-DC converters powering transducers

Several of these transducers requires isolation as recommended here in their manual: The transducer models are uni-polar 0-10V output which require 24VDC power supplies. So at the moment there is a ...
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1answer
60 views

Undefined Symbol in ltspice code and what is heightened Def Con? [closed]

Thank you for your inputs. I have attached the schematic. I am using third party models for simulation. The problems seems to be with some unrecognizable attribute by LTspice. ...
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860 views

How can I float a pin that otherwise should be low?

I want to enable/disable a TI TPS54302 buck regulator with a microcontroller. The enable (EN) pin should float to enable the device, or be tied low to disable it. I currently have the EN pin ...
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1answer
33 views

Mitigate TPS56* ecomode ripple effect under lighter loads

Following my question Powering up analog part of the video card (thanks everyone for their inputs and advices) I have chosen the devices, and even have drawn the circuit diagram of 12 V to 5 V power ...
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1answer
70 views

Power a guitar pedal (usually takes 9V power) with a single AA battery

This is not necessarily for real life application, but more for the challenge: would it be possible to power an existing guitar pedal (let's say a Roland / Boss saturation, fuzz, reverb, delay, etc.) ...
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57 views

DC-DC Converter Control Loop Stability

I have asked a similar type of question previously. This one is a little different. Assume, we have the Bode plot of a Control Loop System. In this case, DC-DC Converter. I measure the Gain ...
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54 views

Use step-down 1.3-35V converter together with a step-up 5-24V converter

I want to build a variable power supply. I am using a computer power supply and I want to make the 5 volt 20A output variable. I found an online website that has all the components that I need. ...
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35 views

Control Loop Stability - Crossover frequency

I am testing the control loop stability of a DC-DC Converter. One of the Pass-criteria of the DC-DC Converter states, "Cross over frequency should not be higher than 1/8th of switching frequency" ...
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How can I increse 12V and 0.5A DC to 200V DC?

I am very new in electrical circuits and I need help to create a circuit which would create from 12V and max 0.5A input, output with 200V and some small current. Consequently, I need to regulate this ...
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1answer
42 views

How to chose resettable fuse for 24 V DC to 5V DC converter?

I want to use a 24V to 5V DC converter, the PYBJ10-Q24-S5 (https://www.mouser.fr/datasheet/2/670/pybj10-om-1548233.pdf). Page 7 of the datasheet, they specified the EMC Recommended Circuit which ...
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27 views

Difference between magnetizing inductance and primary inductance

What is difference between magnetising inductance(Lm) and primary inductance(Lp) of transformer?
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2answers
67 views

Maximum capacitive loading for DC-DC converter - how to calculate?

Following this answer I looked into the datasheet of the OKI-78SR-5/1.5-W36-C and see the following: In general the requirement is clear for me: resistance at the start event must not be too low for ...
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115 views

Multiplication of average voltage and current?

Multiplication of \$V_{rms}\$ and \$I_{rms}\$ gives average power. What things we get if we multiply \$V_{avg}\$ and \$I_{avg}\$??
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56 views

Reducing 16.5VDC battery output to the range of 13.8VDC +- 15% without introducing noise for 15 Amp load

The title pretty much says it all. The (up to) 15A load is a ham radio, which is the reason for the 'no noise' constraint. Maybe a tiny bit of noise is OK? I don't know how I could tell. To save you ...
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Buck converter shutdown

I just put together a buck bonverter PCB that I designed and am using the SiC437 from Vishay. DataSheet I am using a power supply to control and measure the input supply voltage and current. I am ...
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1answer
47 views

Charge-Pump Cap Power Dissipation in Voltage Converters

Here https://www.maximintegrated.com/en/app-notes/index.mvp/id/725 and here https://www.analog.com/media/en/technical-documentation/data-sheets/ADP3603.pdf The same calculation for the power ...
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2answers
74 views

CC/CV Buck controller

in this model can anyone explain me how is it going to work in CV mode and where is the potential divider and all, like where is the Vfb
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32 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
42 views

MC34063A - 3.7 to 1.5 buck converter voltage rises when load applies

I designed and created this circuit to get 1.5 V out of 18650 lithium ion battery cell (with protection board). Circuit is built to use in a toy, so not a serious use. It shows open circuit voltage ...
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124 views

Traco DC-DC Converter

I am using THN 15-1215N for generating 24V from 12V input. Since this module has a second output(Negative) can I connect this to the ground to obtain only a single output? Edit:- I am using the ...
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52 views

MP1584 5v regulator voltage drop problem

I was debugging the MP1584 module, 5v regulator circuit in the PCB. I have attached my debug circuit below. I have completed my circuit in breadboard and PCB also, but I was connected to any load ...
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80 views

Looking for help improving power control circuit

I am looking for ideas on improving the circuit below. Any constructive criticism is very much appreciated as well. The following is a long explanation how I arrived at this monstrosity, it can be ...
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33 views

Why is the LM5122 DC-DC Converter not working past a certain current?

We've been trying to get a 12V to 24V DC-DC converter working using the circuit detailed in the LM5122EVM-2PH datasheet (http://www.ti.com/lit/ug/snvu205/snvu205.pdf), but have run into an issue. The ...
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1answer
55 views

Less noisy version of max232

After (mentally) banging my head at the wall wondering why my own circuit is glitchy after the PC communicates with it, I read some posts, and noticed others had very similar problems. All because the ...
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1answer
47 views

Are there any modern tradeoffs that come with designing more efficient DC-DC switching power converters?

Are there common metrics that usually degrade (ex. ramp time, line/load regulation, low-load efficiency) when pursuing more efficient designs, especially for isolated converters? If you saw a new ...
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750 views

Which has less energy loss - AC step up/step down transformers or DC to DC step up/down converters?

In the EE field, AC transformers are constantly talked about. However, I don't hear much of DC to DC converter modules, even though DC is widely used today, mostly in smaller electronics. Both of ...
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1answer
48 views

MC34063A step up voltage converter

i need change 5v to 12v that it use to supply a device; for this use MC34063A step up voltage converter; this site can calculate the parameter. i have problem all thinks is OK but i have same voltage ...
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1answer
40 views

Inductor Voltage and Current Phase Delay on a DC Converter

We learn that inductors introduce phase delay between voltage and current for AC. On a DC-DC converter, such as boost, we have, at the inductor, a DC component superimposed with AC component with many ...
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63 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
101 views

Low Quiescent LDO vs. Buck Converter: Which is better for low power applications?

I'm stuck between choosing to use either a buck converter or a LDO voltage regulator for my heated glove project. The voltage regulator's function in question will be to power the microcontroller. ...
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1answer
41 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
69 views

Why is my Miller plateau not zero slope (horizontal) but drops down in voltage?

I am a novice in the field and am currently working on a DC-DC converter and was trying to enhance its performance. After some research, I found out that the Miller plateau is usually of zero slope (...
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1answer
142 views

Why is my Voltmeter/Ammeter not reading amps correctly?

I am having problems correctly setting up my volt/ammeters. I am attempting to use them to monitor a boost converter I recently purchased. I would like to have one set up on the input of the boost ...
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How to estimate NMOS Cds+Cdb capacitance from VDMOS Pspice/LTSpice model?

I'm designing a fly-back converter and in order to calculate the switching frequency I want to know a method or formula of how estimate the Cds+Cdb capacitance of NMOS switch using the Pspice ...
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1answer
47 views

switch-mode power supply

First post here. I'm making a DC/DC converter which will generate an output of 19.5V 18A. Its a synchronous buck converter with the LM5145 TI chip. When I have light load on the converter the output ...
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159 views

Buck Converter dies unpredictably upon connecting power

I made a PCB for an ESP32-based solenoid controller that is powered by a 24V DC Jack. I'm using an AP63205 Buck Converter to step that input down to 5V DC, and then a linear 3V3 LDO to power the ESP32....
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45 views

TL5001 based buck converter from 12V to 5V…MOSFET is getting hot

I am using TL5001 PWM controller IC to build a buck converter with the following specs: Input voltage = 10-14V, typical 12V Output Voltage = 5V Output current = 1A Output voltage ripple = 50mv ...
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70 views

A multi rail dc to dc power supply circuit design; thoughts and recommendations

I am trying to design or put together a multi rail dc to dc power supply circuit using Texas Instrument webench power supply. My input for this power supply will be 12V and I will have 5 hot ...
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1answer
89 views

Boost converter increase current

I have boost converter powered by 2 AA batteries (3v) which increases the voltage to around 40v. I have a 12v zener diode to cap the output to 12v. Regardless of the zener diode when I connect a strip ...
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29 views

Bidirectional Cuk and Sepic/Luo Converter

I am looking for sources that explain the bidirectional Cuk converter and/or bidirectional SEPIC/Luo converter. I searched the internet for 7 hours today and did not find anything that explains them ...