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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34 views

How to shield an isolated battery powered system?

I'm currently in the process of "designing" (selecting) a DC-DC Converter solution for a battery powered widget that will operate in the desert. It has to comply with various aspects of ...
0
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0answers
44 views

LM2596 voltage dropping

I bought a cheap LM2596 adjustable buck module from eBay and I connected it to 19V power supply and adjusted it to 5V output. The problem is that when I add load the voltage drops, which is not what ...
0
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2answers
54 views

Powering 12V LED strip lights with a 12V deep cycle battery

I would like to run 16.4' of 12V LED strip lighting with a 12v deep cycle battery. The strip lighting says it uses 1.5W per foot so I'm expecting that I'll need to provide about 2A. I was really ...
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1answer
21 views

Datasheet LTC3892 - how to calculate Rc, Cc1 and Cc2?

I am working on building a DC/DC converter using the LTC3892 chip. I went through the calculations in their datasheet for the chip, but they don't specify any formulas for Rc, Cc1 and Cc2. I don't see ...
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0answers
48 views

Dc-Dc converter

I would like to create a ramp function to compare the output of a dc dc converter with and thus create a PWM signal. Now I have to do this in LTSpiceIV. Any ideas? Thanks in advance
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2answers
78 views

Boost converter design help

I need help on a 12v-220v Boost converter design. the converter is to have a feedback system that keeps the output voltage steady even when the input voltage drops. I have done a lot of reading and ...
0
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0answers
38 views

LT8609 DC/DC stepdown not working correctly

I am using this exact circuit with the exception of a 2.7uH coil (closest available at the local parts store). It is an example provided in the LT8609 datasheet: The only load is an LED with a ...
0
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1answer
33 views

TPS40211 PWM LED driver topology

I've recently been trying to figure out an LED driver circuit for my 32V, 0.7A CoB emitter. I settled on the TPS40211, since it ticked all the boxed in terms of input voltage range, output, etc. I ...
3
votes
1answer
79 views

PCB Layout and Trace Widths for Buck Converter

I am doing a PCB layout for a simple 12V DC to 5VDC buck converter. The rated output is 3A continuous 5A peak. Here are links to the schematic and first go at the pcb layout. I realize the traces are ...
0
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1answer
65 views

Most efficient way to drive a low power LED at half brightness

I'm working on a small project where efficiency is very important (every mA counts). I need to drive two red 3528 LED's in series and only have a 9V DC source. I want the LED's to be only around half ...
1
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1answer
47 views

Overheating Boost Converter

I have designed a board that uses the MIC2251 (SOT-23 package) boost converter to boost 5v from a USB charger to 10v, to power some 2 series LiPo chargers. ...
0
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1answer
44 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 ...
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2answers
81 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
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1answer
40 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 ...
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2answers
102 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
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2answers
49 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
64 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
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3answers
86 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
41 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
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2answers
35 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
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1answer
55 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
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0answers
43 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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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
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1answer
45 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
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1answer
46 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
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1answer
58 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
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2answers
64 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 ...
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votes
1answer
85 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
91 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
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0answers
51 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
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0answers
33 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
114 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
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1answer
57 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
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1answer
69 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 ...
0
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2answers
141 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
102 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
73 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
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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
142 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
102 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
75 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
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1answer
39 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
69 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
25 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
111 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
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3answers
63 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
146 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, ...