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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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32 views

Switch ON/OFF in MAX1709

I am designing a project where I'm going to use the MAX1709 step-up converter. There is a possibility to switch the converter ON/OFF with the help of ONA/ONB inputs, but according to schematic in the ...
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1answer
26 views

Boost converter control in DCM

I am trying to find a reference where a boost converter is controlled in discontinuous conduction mode (DCM) with constant duty cycle and by changing the frequency of operation. More specifically, I ...
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344 views

Cheap 12V to 5V DC-DC converter for PCB? [on hold]

I want to clarify: I understand there have been many questions on this site regarding this same voltage conversion; however, what I am asking is not simply how to convert 12V to 5V but how to do it in ...
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36 views

How to Calculate losses from a DCDC Converter and their effects on battery life

I have a project that requires an odd voltage of 15DCV. The power pack that I plan to build will be two 12DCV 7AH SLA batteries with a DC-DC converter. So I know that my starting conditions will be: ...
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1answer
45 views

Design questions regarding LM2735 (boost-converter) for DC-DC

I'm doodling with a future circuit. The application (Commodore 64) expects 5VDC (which I will provide with a pass-through) and 9VAC 50Hz. I do not have any working circuit or a schematic, because the ...
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2answers
256 views

Buck converter, squeaking/whining inductor

I have a problem with my homemade buck converter. It is based on a TL494 control chip with my discrete MOSFET driver. The problem is that my inductor squeaks and whines, when the output current ...
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1answer
53 views

Two PWM signals from TL494

I need to generate two open-loop PWM signals with different duty cycles for my converter. The frequency is 20kHz. I did generate one signal. Should I use another TL494 and connect it to the same ...
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5answers
75 views

Can voltage and current be stepped up and connected together

Ok if a boost convertor is used to step up voltage, then a seperate buck convertor is used to step down, increasing the current, can these two be configured to utilize the high voltage on one output, ...
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72 views

Avoiding DC voltage drop for surveillance cameras over long distances

Trying to power 2 HD-TVI cameras 800 ft away from my home office. The wall mounted adapter provides 12v DC at 1 amp. I am looking for a good solution at the lowest possible cost. There are ...
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0answers
23 views

2 Switch Forward Converter Volt-Sec/Charge Balance

I am attempting to design a 2 switch forward converter. I understand how to do the volt-sec balance and charge balance when the converter is as shown in the ideal 2 switch forward converter below. I ...
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0answers
53 views

Controlling Buck converter (XL4016) with microcontroller

Briefly the project I'm working on is made up of a blue pill, rotary encoder, acs712 30 amp current sensor and an OLED display. Everything is in functional state. The aim is to provide a stable ...
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1answer
45 views

PCB design for MAX1709ESE

I am thinking of using MAX1709ESE step-up converter in my DIY project, and from the datasheet I have found that the chip is manufactured in SOIC16 case without a thermal pad (as opposed to MAX1709EUI+)...
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75 views

Can I use a DC-DC step-up module for a small form factor computer? [closed]

I want to design a DC power supply for my Intel NUC small form factor PC using a battery. The data-sheet for the PC: ...
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1answer
71 views

12v to 1.8v 3.3v 5v

I'm fairly new to electrical engineering, tried my hand at a power supply circuit based on the Texas Instruments buck converter TPS65261RHBR. Goal is to step down from a 12V lawnmower battery to ...
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1answer
32 views

dual rail DC/DC convertor and CMC

I have a DC/DC convertor that tales 5V and makes + 15V and -15V rails My question is how to place common mode chokes to reduce common mode noise. Should I place 3 of them (1 on the negative to Gnd , ...
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1answer
48 views

Driving 8 x 117W COB LEDs [closed]

I am currently attempting to design a LED grow light using the following LEDs but I am having a very hard time finding a sufficient power supply. 8 x Lumileds - SunPlus CoBs DataSheet 51.7 V, ...
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1answer
56 views

Using a battery as a voltage source in a DC DC converter to supply a second battery?

I was wondering if I could use a battery as Vin to a DC DC converter to charge another battery. Example: Using a Li Ion battery pack and having it go through the DC to DC converter to charge a LiPo ...
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1answer
39 views

Help needed for HV DC/DC converter

I need to design a boost converter that outputs ~20 mA DC and an unloaded voltage of around 68-100 V. The inverter will be part of a Zener diode analyzer. I built it on the idea of the Joule thief (...
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1answer
80 views

DC/DC converter from 9V to around 180V - LTspice simulation

I am trying to simulate circuit from link: Nixie power supply, but I have come into some problems. I downloaded MC34063 from this forum and example in package is working perfectly. Below is my circuit ...
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0answers
19 views

SEPIC vs. ZETA feedback

When I was reading through the RECOM book of knowledge DC-DC, I found out that the SEPIC converter has more chance of having resonance feedback than the ZETA converter. They mention that the SEPIC has ...
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1answer
39 views

Mini 360 buck converter: 5v to 3.6v possible?

I am new to electronics and for my first project, I am using an esp8266 12 e WiFi chip to put together an air sensor web server. My breadboard prototype works but I want to add some other sensors ...
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3answers
165 views

Why is current controlled feedback faster than voltage controlled feedback in PWM controllers?

Looking at modern ICs, we prefer current control feedback over voltage control feedback, due to the speed of the feedback. Current control will react faster than voltage control. Here are 2 images, ...
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75 views

Why can't certain isolated DC/DC converters operate at over 50% duty cycle?

I am currently studying two switch isolated DC/DC converters, more specifically the Push-Pull, the Half-Bridge and the Full-Bridge DC/DC converters. Several books say that these converters cannot ...
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2answers
106 views

DC 12 V to 2000 V circuit

I want to design a battery operated pest trap (electrocuter). So far I have found out that the electrocuter snaps the insect at about 2000 V when it completes the circuit by landing on 2 nearby wire-...
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1answer
72 views

Flyback discontinuous mode, double voltage over the switch

Considering the following simplified flyback schematic. Which has the following voltage current graphs Why is there 2*Vin over the switch when the switch is turned off? And why is that change to Vin ...
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2answers
40 views

i dont want to change voltage but only regulate input voltage

It is my first power supply project. I will supply 300 watt vehicle audio amplifier with this supply. I will use nominal 24V and 14A at my system Vehicle input 24V and my amlifier 12V-30V but when i ...
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2answers
64 views

Powering an onboard car GPS tracker

I made a car tracker (a GPS/LTE module connected to an arduino that communicate to my web server) to log gps positionning data. I’m planning to use this to track my new car in case it gets stolen. My ...
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30 views

Need to boost 20vdc to 84vdc 90 watts . Is this a taller feat then a 60v boost circuit? going from usbc breakout board fairchild chipset

I've already made one that goes 60volt, but now have a device that needs 84 volts to the input of a BMS (battery management circuit). 90 watts -- OEM charger is 1.45 amps @84 volts. https://www....
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2answers
88 views

How to Convert 28V to 12V?

I have to use a 28V DC power supply for a certain design I am doing. But I only need 12V DC to power up this device. How would I design this in a schematic? What would I need? I have been searching up ...
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0answers
28 views

Size and weight of DC-DC vs DC-AC at equivalent powers

I am looking at designing two power systems for a project and was wondering, at equivalent power, let's say 10kW, what is the system that is easier to design, can be smaller in volume and lighter in ...
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1answer
44 views

Function of transformer as a filter in isolated DC-DC converters

As far as I understand the isolation is achieved by a transformer(and besides this sometimes also using an optoisolator for the feedback part) in a DC-DC converter. And this is a galvanic isolation.(I ...
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2answers
126 views

How to fully shutdown a boost converter?

I've been working on a boost converter based on an LM2733-Y integrated circuit, as follows: My question is, how to shut it down completely? If the SHDN pin is in low state, I get the input voltage ...
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Designing a +10 V -10 V +7 V DC power supply for audio equipment

I've recently purchased a tape recorder (Tascam Midistudio 644) that was very cheap because the previous owner had lost the power supply. The PS-M1 power supply that originally came with this unit is ...
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1answer
118 views

Choosing a suitable power supply for a MOSFET driver chip

I would like to use the TC4427 MOSFET driver chip, in order to switch the current through the IGBT AUIRG4PH50S, which will be placed in series with a resistive load. The power supply providing the ...
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2answers
880 views

12V to 5V DC-DC converter is outputting 7.5V

I recently bought these DC-DC converters. But when I apply 12VDC to the input I always observe 7.5V on the scope instead of 5V, I tried with a 680k load still 7.5V. But the datasheet says this is 12 ...
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2answers
67 views

Voltage control

I've been trying to design a control circuit to switch supply. What I want to achieve? I need 24V voltage for supplying an ultrasound sensor. There are two ways of gaining 24V: ...
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1answer
57 views

boost converter to high voltages (20kv+)

I am interested in making a mini, potentially portable ion thruster. The Question: Is it possible to create a boost converter that takes low voltage batteries ranging from 3.7V to 24V and boost that ...
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1answer
39 views

Coupled DC/DC-modules - correct input filtering

According to the support from TracoPower I use two THN-30WI modules (­±15V) in conjunction as shown below (without each C1 and C2) to produce ±30V. This works but I get a lot of noise. The ...
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2answers
54 views

Design an AC/DC Nonisolated Switching Mode Power Supply

I'm designing a fifth generation pcb for my project and yet I stumbled across another design problem. First of all, the circuit and all components are enclosed from the environment and users (because ...
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4answers
77 views

how to choose components for boost converter

I'm relatively new to electronics and I'm trying to make a boost converter for a nixie tube watch that runs off of 3v. I'm pretty sure that the most current that will be drawn is about 70mA. I'm not ...
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1answer
41 views

What practices would improve this scenario for the power transfer

As a part of a measuring project by a mobile phone on the top of a 100 meter tall mast, the mobile phone will be powered by 5V DC of a DC-DC converter output where its input voltage is 12V DC on the ...
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0answers
43 views

Isolated vs non-isolated boost converter for LED (12v to 24v)

I have a 12v system in my motorhome and planning on installing 24v LED strips, however, I'm unsure whether I would need an isolated or a non-isolated boost converter. I'll be using roughly 5 meters ...
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1answer
50 views

Burst mode in synchronous buck converter with current mode control?

I read this previous question: The meaning of Burst Mode It says burst mode happens when the resistance of the load is light and the system stops switching the MOSFETs. However, I just cannot ...
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2answers
82 views

How to deal with “peaks” voltages in mosfet in boost converter?

I'm designing a Boost Converter to go from 5 [V] to 12 [V]. The design I came with is the following: To understand better the design, please note the following: 1) To drive the mosfet I'm using a ...
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1answer
103 views

DC converters for solar cell

As we know, the voltage level of a solar cell is lower than what a rechargable battery needs, and thus a DC converter is placed in between.( With feedback control for optimum V-I curve) This just ...
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1answer
58 views

Difference series resonant and LLC DC/DC converter

What is the exact difference between a series LC resonant converter and an LLC converter. From a topological perspective, they seem to be exactly the same. I believe that for an LLC, also the ...
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1answer
47 views

Low power design, choosing correct buck-boost converter for LiPo battery

I want your opinion on subject considering low power applications. I want to build basic loraWan tracker with Murata Lora module(3V3), and I want to use LiPo battery. What Im struggling with is power ...
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3answers
93 views

5V Regulator causing component damage [closed]

Im using a 5V OKI Murata DC-DC device to power an Arduino UNO R3 and a 4 channel 433MHz receiver. Ive got a 24V DC source which is a bench PSU at the moment. But ive noticed that every so often the RF ...
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2answers
176 views

Flyback Converter Capacitor Value selection with given ripple voltage limit

I need to design a flyback converter for my project. In my design the output voltage is 15 V. I calculated all the parameters including inductance values, diodes selection etc. However there is a ...
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1answer
49 views

Acceptable Buck Converter Output

I've just put together my first busk converter with a LMR16006Y-Q1. http://www.ti.com/lit/ds/symlink/lmr16006y-q1.pdf Here is what it looks like on the scope. The Pink signal is unloaded, the other ...