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 ...

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0
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1answer
18 views

How to determine correct replacement transformer for flyback converter in commercial product

I have an MPPT charge controller that has recently started behaving strangely and upon investigation I found a very hot mosfet and a transformer (below) that has clearly seen more heat than it should ...
-2
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0answers
67 views

How to Convert 24V DC to 5V DC 3 A? [on hold]

I have input as 24V DC. I have two other devices. First wants 5V 2A and second wants 5V 1A. So I want to convert 24V DC to 5V 3A DC. How to make this? Can anyone guide me to make this circuit? ...
1
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2answers
63 views

30V adjustable current LED driver

I've recently started a project that has some pretty loose specifications. I need to develop an LED driver that can take an input of somewhere between 7.2 and 24V, and drive an LED panel at 30V with a ...
0
votes
1answer
36 views

PSU with dc stepdown buck

I want to connect different LEDs that have these parameters (the LEDs I am using are just generic LEDs I got from ebay.): Led 1: 6.4V - 7.2V @ 0.7A Led 2: 2.9V - 5.6V @ 1.9A Led 3: 8V - 12V @ 3.4A ...
0
votes
2answers
94 views

what are the possibilities for Op amp's power supplies?

I am looking for a way to remap a voltage between 0..24 volts to 0..5 volts in order to read this voltage in a microcontroller ADC.For that ,I am intending to use an operational amplifier as an ...
0
votes
2answers
42 views

Layout of doubled SW pin on buck converter IC

I'm working on a PCB for the MP2617. That IC integrates a buck converter and has two physical SW pins sandwiching the VIN pin, as shown in my tentative layout below. No other pins on the IC are ...
0
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0answers
56 views

What is the best way to share 12V, 22V, and 5V power?

Please bear with me - I'm a software developer that hasn't worked with electronics since college. I'm trying to replace the internal electronics on this pinball machine: ...
1
vote
3answers
70 views

PCB layout of buck converter: capacitor placement

I'm designing a PCB for an IC that includes a DC/DC buck converter (MP2617). This is my first PCB, so I've been using the following resources for the layout: 1 and 2 (PDF files, the first one is a ...
0
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2answers
38 views

Voltage regulator current consmption

Our pcb current consumption is less than 0.5mA . We use a 3.7v lithium battery, and the battery goes through voltage regulator ...
0
votes
2answers
27 views

MAX1771 MAXIM 4.2V TO 5V

I am working with MAX1771 Step Up converter, from Maxim in the adjustable mode. I would like to have a continous output voltage of 5V so I have used the application circuit that you can find in the ...
0
votes
1answer
49 views

3.3V Voltage Regulator for LiPol battery [closed]

I'm looking for a low drop voltage regulator to use in a 600mA – 1000mA (peak) 3.3v system that can be powered either through a singe-cell LiPol battery or USB (so a max drop of ~0.4V). So far the ...
0
votes
0answers
39 views

Switching regulator discontinuous mode

I designed a step down converter for my circuit using the following converter: http://www.ti.com/lit/ds/symlink/lm1575.pdf It converts 16V to 3.3V. As I summed up the current consumption of my ...
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votes
1answer
24 views

Drawn current in industrial sensors and drivers

I am asked to build a simple 5 volt to 24 volt adapting circuit. For this purpose, i need to know the maximum current that can be drawn from industrial sensors and industrial machines drivers such AC ...
0
votes
1answer
37 views

Connecting grounds when using an isolated DC/DC converter

I am designing a PCB that needs to convert 24V DC to 5V DC @ 8 amps. I would like to use an off-the-shelf converter and virtually everything in that range is an isolated DC-DC converter. Is there any ...
0
votes
1answer
45 views

Best way to regulate high voltage

I am currently working on a motor driver that should operate on 100V or higher voltages. I need to implement logic there with 3.3V. I could provide additional, low voltage source but that would give ...
0
votes
1answer
55 views

Linear to exponential ramp converter

Hi, I need a circuit to convert a linear ramp to an exponential curve, as shown below. Can anyone help? These are simple voltage ramps, not periodic waves. Thanks
0
votes
1answer
44 views

USB to 3v converter to power a battery powered FM transmitter?

I have a SCOSCHE FM Transmitter which practically eats up 2xAAA batteries, I was thinking of using my TV's USB power for the transmitter. My search lead me to this 3 in 1 DC-DC USB 5V to 3.3V ...
-10
votes
1answer
79 views

convert 5volts to 6.5volts with simplest circuit [closed]

i need to convert 5 volts to 6.5 volts. i also need the circuit to be as simple as possible using the least amount of components. eg.like using single resistor or capacitor the 5 voltage supply will ...
0
votes
2answers
83 views

Powering multiple devices with different ratings from a single supply

I'm planning to power devices with different ratings from a single supply. Some of the devices have ratings such as 5V/2A, 5V/4A, 12V/2A etc., Currently they're being powered with seperate adapters. I ...
1
vote
0answers
50 views

DC/DC Converter MOSFET switching

I am currently building a SEPIC converter. The signal arriving from the MOSFET driver to the MOSFET seems all good, however the Vds doesn't seem to follow the drivers signal and it makes the MOSFET ...
0
votes
0answers
30 views

Arduino Ethernet shield

I have some problem with Arduino and Ethernet shield. I have a small project with Arduino. Sensors send data to webserver. Everything works fine when arduino getting power from PC usb but when i give ...
0
votes
1answer
24 views

current density value for inductor used in boost converter

I am designing boost converter. I need to select inductor for the same. As a new bee i don't know the criteria for selecting the same. (1)what is the maximum current density of copper bare wire for ...
1
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3answers
82 views

How to power a 12V fan simply using a PV panel?

I am an electronics noob and I'd like to create some air circulation through my friends cellar using a salvaged 12V 0,8A brushless DC computer fan and a suitable PV panel. I have searched Ebay for 12V ...
0
votes
1answer
48 views

DC DC converter control design, PID vs compensators

I have to make a dc dc converter to power a resistive load, and I have reviewed various applications notes, and applications reports like SLVA633 and SLVA662 They make uses of an compensator design ...
1
vote
1answer
63 views

Boost converter with 2A load

I'm trying to put together a boost converter to take a 11-14.4v input and boost it to ~17v with a max current of 2A. Most of my designs (made either by calculations done by me or a calculator tool ...
0
votes
1answer
55 views

Problem with inverting DC/DC converter

I am using an inverting DC/DC converter from TI (TPS6735)(5V,200ma). When connecting a load of 100ohms it's output dramatically drops to -1V.May I know why it happening like that.Sending my schematic ...
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votes
2answers
131 views

How to easily get -10V and 170V

I have just managed to control an old LCD of type TLX-1013-E0 using an arduino. I would now like to use it for a project. But it needs -10V for the contrast and 170V for the background lighting. ...
1
vote
2answers
96 views

TPS61240 Boost converter IC is not working at all?

I am currently using TPS61240 as a boost converter for my project. As i did not have any sample previously so there was no way I could test it. I ordered the IC and placed it on my final PCB directly. ...
0
votes
1answer
70 views

Looking for possible cause for poor regulation in self designed transformer

I am trying my hand at designing and winding my own ferrite transformer for a push pull 1000watts dc-dc converter from 10-12vdc to 400vdc, with copper foil of 0.3mmx30mm for the primary, and copper ...
0
votes
2answers
26 views

Stopping Vehicle Mounted Units from stopping abruptly

I have installed a touchscreen computer in my old car. The computer runs on 12V DC power supply. I have installed a standard 24V DC to 12V DC converter to power the computer. The 24V DC input to the ...
0
votes
2answers
139 views

Is it possible to add up DC/DC converters in series to create 500V output from 5V input on a PCB?

If I have a 5V input source and I wanted an output voltage of 500V, can I use the output of one DC/DC converter to serve as the input voltage to a second DC/DC converter?
0
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0answers
87 views

Which DC to DC voltage booster circuit is appropriate with respect to efficiency and stability?

I have a sensor that outputs 2mV/V. So for example, If I excite the sensor with 5V, then the sensor outputs 10mV. So, now I want to boost or double the excitation voltage from 5V to 10V. From my ...
1
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2answers
56 views

Peer Review of Buck Converter

The only limitations I can think of are: Comparator/Schmitt not gate output swing time, and Transistor switching time simulate this circuit – Schematic created using CircuitLab BTW, ...
1
vote
1answer
29 views

'Dielectric Strength' parameter meaning for cheap inductior coils

Initially I need an inductor to be used in cheap low-power AC-DC power supply. I'd like to use LNK304 solution: When I reached 1mH coil I found Bourns 77F coils: very cheap (only 8 cents at some ...
-4
votes
1answer
64 views

Programming undervoltage lockout in Boost(Step up) converter

Requirement is to convert 3 V (1.5 x 2 alkaline batteries) dc voltage to 5 V Dc voltage. I know battery voltage decrease with the use and i am required to set a threshold voltage so that if battery ...
0
votes
1answer
22 views

How to view voltage graph in simulink

I am trying to simulate Synchronous Buck DC DC converter I have created the circuit now i want to test it to check whether it is giving me the correct output or not , I have tried the same circuit in ...
5
votes
2answers
97 views

Is there a DC-DC converter topology that can output positive and negative?

E.g. Is there a converter topology that can take a 12v input and convert it to -12 to +12v output with respect to GND? For the record I'd really prefer something that doesn't use rare magnetics. I ...
0
votes
1answer
48 views

Cant figure out a solution for 27V, 3A supply

I have a pretty weird situation I need to produce 27V, 3A from a supply of 27.5V, at first I thought of using a zener as the voltage regulator but I could not find a zener of over 81mW, with zener as ...
0
votes
3answers
56 views

The role of reference voltage in buck converters?

I asked a question here which made it quite clear that it's probably not a good start to make something that I plug directly into the mains. Instead, I've decided to build a low-voltage buck ...
1
vote
3answers
131 views

Buck converter based switching power supply?

simulate this circuit – Schematic created using CircuitLab I have designed this circuit based on a buck converter. I'm just having trouble finding out which values to plug in. I.E. C1, ...
0
votes
2answers
99 views

Solar Cell to DC-DC converter to Li-Ion charing module, is the DC-DC converter necessary?

I have the following components: 1W Solar Cell (5V at 200mA): http://www.ebay.ca/itm/291435192356 DC-DC Converter (2.5V Vin_min, set to 5V Vout): http://www.ebay.ca/itm/200983543561 5V Lithium Ion ...
0
votes
2answers
66 views

DC-DC & Solar Question

I normally am pretty good with electrics and they taught us about them in a few of my classes, specifically my into to engineering courses. I however don't know a ton about solar panels so this ...
0
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0answers
49 views

How does Mean Well LDD range DC-DC constant current drivers handle dimming?

Mean Well LDD range DC-DC, constant current buck drivers have dimming function. 5v PWM signal allows you to dim the LEDs. Without PWM, you get the full rated current output. Now knowing anything ...
1
vote
2answers
199 views

Is it OK to use switching regulators to charge mobile phones (and such)?

I had several issues with car usb adapters (dc-dc step-down regulators), and I'd like to make one myself. Issues: Nokia cell phone refusing to charge Motorola phone power supply circuitry fried ...
2
votes
1answer
81 views

Switching supply burning mosfets, what is happening?

I have been working on a SEPIC converter for an electronic cigarette power supply. This application involves using two 3.7v INR batteries in parallel, rated for an appropriately high current ...
0
votes
1answer
28 views

Does DC DC switching converter needs pot readjusting on input voltage change?

I have adjusted my LM2596 regulator to 5V output with 16V input. I'm about to change the input to 25V. Will my 5v output stay the same or do I need to adjust the pot again ? I can't easily test ...
0
votes
2answers
57 views

Working 12V ups circuit?

I've looked at similar threads on stackechange but none seem to provide an answer. I have 2 devices running on 12v DC. One at 1A and the other at 2A. I had an existing 12V 7Ah lead acid battery ...
0
votes
0answers
69 views

Does anyone know why DC-DC converter have noise

I am running an issue that my custom board has noise come from DC-DC converter after running a while. I used V78W-500 as the DC-DC converter and already replaced a new one. Except noise, the voltage ...
0
votes
1answer
28 views

Periodic Steady State voltage Buck Converter

What does Periodic Steady state mean with regard to a Buck Converter ? Does it mean the normal operation ? Also, From what I read, the net change in the capacitor voltage in the buck converter is ...
-1
votes
1answer
73 views

MC33063 heating problem

I'm using a MC33063 to generate a -9V supply to power 7 TL084's. I'm using a 7805 regulator to power the 33063 circuit. However, the IC and the regulator heats up a lot -- I burned one IC due to that. ...