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)

Filter by
Sorted by
Tagged with
0
votes
1answer
24 views

L5973 (step down) used in constant current oscillates

For a couple of days i'am playing with a L5973 dc - dc converter whith I want to convert to a constant current driver for 5 or 10W LED's. It kind of works but I get some oscillations in audible range. ...
0
votes
3answers
40 views

What is affected by DC/DC converter frequency selection?

I planning to use the LMR33640 DC/DC converter which exists in 400kHz and 1MHz switching frequency versions. I know that the 1MHz version allows to use a smaller inductors. But I think that the 1MHz ...
0
votes
2answers
24 views

Calculation of max possible current load from voltage multiplier connected to PSU 12V rail

today I found in a box a PSU with two 12V rails each delivering 17A (Fortron SAGA II 400W) and decided to step-up the voltage so can feed the DPS5020-USB DC-DC converter (rated at 60V/20A max output). ...
0
votes
1answer
31 views

DC-DC Buck, Selective Voltage Binning (SVB) technique

I have been trying to understand SVB technique and unable to understand how it is implemented in a DC-DC buck converter as shown in the schematic below. Can someone please explain the SVB circuit part ...
0
votes
1answer
47 views

Non inverting DC-DC converter that makes fix 4V from a decreasing voltage from 4,2V to 2,8V? [closed]

Is it possible to make a a non inverting DC-DC converter that makes a fix 4V from a Li-ion battery's voltage. I need about 1,5A. The input voltage starts from 4,2V and decreasing to 2,8V as the ...
0
votes
3answers
84 views

I can't understand the function of this diode

On a past project, I've used the LM2576 buck converter with success. However, I've never understood how the catch diode works (D1 on the diagram). The datasheet explains the importance of the diode, ...
0
votes
1answer
52 views

Improve the performance of Buck Converter Loop Stability

The following are the specifications of my Buck Converter. Input Voltage Range : 6V to 16V Output Voltage : 5V Switching Freq : 2.1MHz Output Inductor : 22uH Minimum Load Current : 200mA Typical ...
0
votes
1answer
88 views

When power removed from LED circuit LED stays on

I have a 12v DC input that I am stepping down to 2v with 610 ohm resistor. When power is removed the light is staying on for a period of time and slowly dims. Would the resistor be acting like a ...
0
votes
1answer
32 views

Input/Output Impedance of DC/DC converters and Impedance matching

I am interested in understanding how do DC/DC converters achieve impedance matching for maximum power transfer applications. After visiting this entry, you can see in the "impedance matching" ...
0
votes
1answer
19 views

Can we use DC-DC Buck convert installed 3.8v battery to power Phone continuously?

I have a Windows tablet whose battery is dead and I want to convert it to without battery to use as a digital photo frame. Table dead battery is 3.8V Can I use DC-DC Buck convert (DC-DC converter ...
0
votes
1answer
72 views

Understanding a chinese Ringing Choke Converter

I got a Chinese torch with a charger supposedly needed to charge the (removable) Li-Ion cell in it. The connection is direct to the unprotected cell, but the charger shows a spec of 4.2V +/- 0.5V. ...
0
votes
2answers
62 views

Flyback converter role of diode in parallel to primary windings

I am trying hard to remember the role of the Diode labeled "D1" and marked with a red circle in the following schematic of the flyback converter below: Why do we need a diode there? I know the RLC ...
2
votes
1answer
48 views

FAN6754 flyback converter-overcurrent problem

I have a design 193V output voltage and 700mA current, but when the current drawn from output, the auxilary winding voltage fall down, and IC shut down PWM gate signal as you can see in the attachment ...
2
votes
2answers
89 views

Is building a DC-DC PSU PWM controller from discrete components a terrible idea?

I am building a 1kW PSU that is controlled with DSP MCU. It requires a lot of features such as synchronous rectification, bidirectionality, current regulation. Those features make the PSU very exotic ...
0
votes
2answers
68 views

Misconceptions about layout of DC to DC step-down converters

I have noticed, in my opinion, some misconceptions in the layout of the majority of DC to DC step-down converters. I've seen in many PCBs that the trace that goes to the input of the converter (point ...
3
votes
2answers
231 views

How to select DC-DC converter topology?

I would really appreciate some help on this one. I am doing my bachelor's thesis/project which requires me to design and construct a DC-DC converter. I have been working on it for a couple of weeks ...
0
votes
0answers
33 views

Improve protection of device that got damaged by a primary side short

Today I swapped one of our devices that got damaged by the customer during installation. The device consists of a base board with several modules (power supply, IO cards, processor board, display+USB, ...
0
votes
1answer
67 views

DC/DC split rail converter with coupled inductor

I'm trying to build a DC-DC split-rail converter using circuit from this article. My goal is to split 12..14V input voltage into +2.4V and -2.4V. To do that, I choosed LM1501AGR-ADJ IC, calculated the ...
1
vote
1answer
56 views

Where to put a voltage (DC/DC) converter that must be switched on/off by the control signal?

My device only has 5 V power supply, and this is difficult to change. I must operate another, smaller device that requires 12 V. I plan to use some DC/DC converter like TMA 0512D to produce the ...
0
votes
0answers
30 views

How to determine these resistors in 2-pole 2-zero feedback loop compensation

I'm trying to build a 2-pole 2-zero feedback loop compensation for controlling a full bridge dc-dc converter. It's my first time doing this and I'm following the book power supply cookbook. Book is ...
3
votes
3answers
595 views

DCDC converter in series

I need to convert 5V (main power supply) to +/- 30V. I have two +/-15V DCDC converters and was wondering if I can connect them in series to generate the +30V and -30V rail? My simple schematic I ...
0
votes
1answer
25 views

MT3608 Improper Output Voltage

SITUATION Hello All, I have designed a PCB the using a MT3608 to produce 5V from an 18650 Li-Ion battery. This is my second revision of the PCB (the first one worked fine), however this one has ...
0
votes
1answer
45 views

Is a 12V voltage step-up USB to 4-Pin PC adapter safe to use in an enclosed space for extended periods of time? [closed]

I am interested in using an adapter cable such as this to power a 4-Pin fan through usb: The fan specifications are as follows: Now, my question is this - Is something like this safe to use for an ...
0
votes
2answers
81 views

Generating more energy from a tree

My son is doing a Science Fair project on dc voltage from trees. We are only getting about 1 volt when they are put in series. He's in 6th grade, what is a simple way to increase the voltage ?
0
votes
0answers
29 views

TPS54260 DC-DC Buck Regulator BOOT and PH pin voltage drop

I am using TPS54260 Buck converter which steps down 16V to 5V output. Load current is 600mA max. To the inrush current through the output inductor, I did some rework. But after some rework, my 5V ...
0
votes
0answers
80 views

How to connect a 12V battery to a 24V system?

I have a 24V battery (two 12V lead/acid in series) connected to solar panels and I'm looking for a way to have a 12V battery and circuit. (But the solar array will charge the 24V system so i need the ...
0
votes
0answers
24 views

Is it risky to use a non-isolated step-up CV/CC controller as a battery charger in a van?

I want to use my van's 14V alternator output to charge the 24V lithium (LTO) house battery. Commercially available devices come with bells and whistles for all kinds of lead batteries that I don't ...
0
votes
2answers
60 views

Diode selection for step-down Converter

I have built quite some buck converters for ~3A@3-5V (~1MHz, 24V Input) and I always used schottky diodes due to their low forward voltage drop (and therefore low power dissipation during free ...
2
votes
5answers
411 views

MC34063 based converter accoustic noise

I am trying to make nixie clock and I use MC34063 for buck/boost converters. The nixie tubes require 180 V to operate and the microcontroller and LEDs need 5 V. I use external 20 V power supply as a ...
0
votes
1answer
70 views

Design dc-dc converter for adjustable voltage

I would like to use the LM61460 (datasheet) to build a buck converter with a Vin of 24v-33v and an adjustable output from 5v at 3a to 20v at 5a for USB power delivery. I used TI Webench to generate a ...
0
votes
0answers
43 views

How to control output voltage of DC to DC Step Up Fly Back?

I need to control the output voltage of Isolated Flyback Step-Up power supply using an MCU may be using DAC or PWM or via a digital pot, how to do this? spec Vin 5V - 8V Iout 40mA Vout max 100V ...
0
votes
1answer
57 views

Homemade LED flashlight [closed]

I want to make my homemade LED flashlight into an old utility light body. My plan is to use XHP70 LED from CREE (12V, 2,8A) and power it using 2S Li-Ion cells (6-8,4 V). My idea is to use boost ...
0
votes
0answers
20 views

Slope compensation of MAX17498

I want to use MAX17498 in boost mode. I have a problem setting the slope compensation. The slope (as I understand) is the gradient of the inductor's current ramp. The unit is [A/s] or [A/us]. However,...
0
votes
2answers
58 views

Is this circuit and values of component correct?

I have traced out the PCB of a DC-DC converter (given.) Is it correct (both circuit and values?) I need constant 5V output. What modifications must I make? updated In the datasheet of the LM2596 ...
0
votes
1answer
34 views

How to make a switching source for voltage converters

I would like to make a automatic switching of source for my buck converter when the input voltage is below 5v. In the very simplified circuit image above as you can see the input voltage can be 3....
0
votes
2answers
107 views

How to run a 0.05A fan with a 10A source? [duplicate]

I am constructing a circuit to drive a powerful LED that requires about 10 amps at 12V. I also have a battery that happily supplies that. For obvious reasons, that LED requires a cooling fan, and I'...
0
votes
0answers
44 views

Why cascode is not used often as a power switch

Say, we are building a synchronous buck and we have some beefy 600V 10A MOSFET, but it is not really suited for high frequency application - we need to be aware of dv/dt limits and it is hard to ...
0
votes
3answers
69 views

How do I calculate the total wattage of a dc to dc circuit?

I am trying to figure out the total wattage of the below assumed dc to dc converter circuit block diagram. Can I get it simply by just multiplying the total SUM of the system output voltages by total ...
0
votes
2answers
54 views

Effect of Discontinuous Conduction Mode of a Buck Converter on Charging IC

I want to use a buck converter to step down a 20VDC Input to 15V to use for a charging IC (BQ24193). The reason for this is because the charging IC I'm using won't operate with a voltage input higher ...
1
vote
3answers
92 views

Is Inductor peak current same as the Inductor Inrush current

I am using a DC-DC converter which is having an inductor rating of 68uH and 2.05A. Output Voltage of dc-dc is 23V and output current max is 300mA Schematic : I am using a current probe and ...
0
votes
1answer
157 views

How to design this filter?

I've a full bridge dc-dc converter and I'm trying to understand it. It has 48V input and 400V output with 1600W rating, 30kHz switching frequency. At the input of this SMPS there's a filter ...
3
votes
2answers
133 views

Is the zeta DC-DC converter topology scalable to 50kW / hundreds of amps?

Question The task at hand is to build a 50kW (e.g. say 125VDC 400A out) DC-DC converter that charges a large lead-acid stack with said 400A and accepts a somewhat wide input voltage range. With that ...
0
votes
3answers
138 views

Redundant DC-DC converter (parallel)

I am building a flight computer for a sounding rocket. I want to include redundant power supplies - in other words: parallel DC-DC converters. What do I need to consider in order to do this? (is my ...
0
votes
3answers
157 views

Limiting output current of a Buck Converter

I am trying to power a 4S-ESC to drive a BLDC motor using a buck converter and 24V,10A SMPS. However, my buck converter can only handle 10 Amps of current (safely) at 15V through its output side. ...
-1
votes
1answer
69 views

How I can reduce drop voltage? [closed]

as shown in fig.below the primary resistance 1ohm and the drop voltage is large when applied 12v only few millivolt applied on transformer how i can reduce it ?
0
votes
0answers
18 views

TEN60-2412 Application note

I am designing a custom board using TEN60-2412. In the application notes, they have provided two application circuits based on EN55022 Class A and EN55022 Class B conducted noise. What are these? ...
1
vote
0answers
36 views

Powering 12V device from USB-PD port not supporting 12V

I would like to power a 12V 2.5A device using barrel connector from a 60W USB-PD capable thunderbolt 3 port. I have a few of those pd trigger cables (https://www.aliexpress.com/item/4000025832414.html)...
1
vote
2answers
46 views

Why would a datasheet's typical application diagram vary so much from the layout guideline on the same datasheet?

In reference to this datasheet, if you see pg2 has the typical application and pg12 has the layout guide. Why would the BST/SS/TON pins be shown unconnected compared to the typical application? They ...
1
vote
3answers
57 views

What is “Supply Input for Analog Functions” on a buck converter?

Regarding this datasheet for a DC Buck Converter, there is a VCC pin that on pg-2 shows an arrow pointing "out". What is this "out" connection arrow used for in practice? Further along on the ...
-1
votes
1answer
87 views

Creating High current DC Power supply [closed]

I have the following resources: Input - 24 V 80 Ah DC Battery (Car Battery) Output, what i want: 12V DC with <2 Amp for driving some of the sensors. 5V DC with <2 Amp for driving micro ...

1 2 3 4 5 28