All Questions
Tagged with dc-dc-converter step-down
57 questions
0
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34
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Adjusting the negative output voltage of a bipolar step-down converter in Proteus
I'm working on designing a bipolar step-down DC-DC converter with a +12V input, targeting ±5V outputs. I'm using flying capacitors for the configuration, and I'm modeling the circuit in Proteus 8.17 ...
- 9
0
votes
1
answer
239
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MT3608 output voltage changing with input voltage
I recently made a small PCB with two MT3608 step-up converters on it, which are powered from a battery. I have two of them. One is for 5V and one for 3.3V.
Here is the problem:
When I power the ...
- 13
0
votes
1
answer
117
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What is the range of the most powerful step down DC/DC converters nowadays?
The team in my lab's company, we want to start using high voltage DC to perform some tests. The electric company can supply us a line of 25kV DC but in reality we would need to chop it to get voltages ...
- 324
0
votes
5
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544
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Shielding Buck Converter
I have a simple question, and I want to ensure that nothing unexpected happens. I'm currently working on a Raspberry Pi-based robot project with a Pi camera, and I plan to power it with a battery, ...
- 53
0
votes
1
answer
55
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Variable Vout of Buck Converter [duplicate]
I have been trying to understand the working of buck converter (without the use of a dedicated IC). So, I used LTspice to test a circuit on the parameters:
Vin: 100 V
Vout: 50 V
Freq.: 10 kHz
I: 5 A
...
- 117
1
vote
0
answers
86
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Desigining a 3S battery charger step-down buck converter
I'm a hobbyist, so my electrical engineering skills are not top notch.
I'm service tech and I'm working on modifying portable coolers (thermoelectric and compressor based) where we add batteries to ...
- 157
0
votes
2
answers
712
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Can I use a buck converter and a 12 V adaptor to create a 5 V and a 12 V circuit?
I have a microcontroller that is powered by 5 V and some solenoids that need 12 V. At the moment I power the solenoids using a 12 V adapter and switch them on and off through MOSFETs which are in turn ...
- 35
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1
answer
38
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Where does the Step-Down Convertor used as compare to RECOM DC/DC converter?
I am reading Step-Down converter and given the circuit below, which is a step down converter. It consists of a MOSFET, inductor, diode, capacitor
And if I compare it with RECOM component DC/DC ...
- 113
2
votes
3
answers
2k
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Buck converter adjustable output-voltage using digital potentiometer [closed]
I am trying to design a buck converter using an LM2576HV (Vref: 1.23 V) and a digital potentiometer (input: 48 V, output: 0 to 48 V, Imax= 3 A).
The digital potentiometer with the highest supply ...
- 21
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votes
1
answer
2k
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24V to 5V step down voltage regulator with LM2678 [closed]
Reference: https://www.ti.com/lit/ds/symlink/lm2678.pdf
I have constructed the circuit above attempting to step down the DC voltage from 24V to 5V. But I keep getting 8.3V as the output voltage. It is ...
- 11
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votes
1
answer
512
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Convert 24V battery output to 12V (step down)
I want to convert the output of my stronger Li battery (24 V) to some devices that require 12 V
24 V Battery Specs:
Output V: 21-29,4 V
Capacity: 15 Ah
Max Current peak: 36 A
Max Current: 18 A
12 V ...
- 173
0
votes
1
answer
566
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Is this the right way to power a 12V LED and Raspberry Pi from the same 12V power source?
So I am trying to control an LED with a Raspberry Pi. It's a 12V LED, and the RPi needs 5V.
From the research I have done so far, it looks like a good way to do this would be to use the GPIO port on ...
- 153
1
vote
3
answers
659
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DC motor: DC-DC converter vs PWM
In a cave we are exploring we are currently blocked by a small siphon, which we would like to empty into another gallery.
For this, I would like to use a 12 V pump (not selected yet).
As a power ...
- 8,118
0
votes
1
answer
67
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Defining VIN trace width of DC\DC
I intend to use RT8068A in the following design:
The requirements are: Vin = 3.3V, Vout= 2.5V, Iout_Max = 1A (+VPP is connected to DDR4 Memory SODIMM-260, 32GB, 2400MHz/2666MHz, 1.2V).
My question is,...
- 1,097
3
votes
0
answers
207
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LM3150 Webench not matching with LTSpice?
I'm trying to implement this design from Webench (5V @ 10A):
I'm using LTspice to simulate this design, but my results are bizarre, as shown here:
I have looked into this thread: TI Webench and ...
- 31
-2
votes
1
answer
56
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Can I use DC-DC step down converter on infrared illuminator LED 5 mm, 940 nm [duplicate]
I was thinking if i use dc-dc step down converter on infrared LED 5 mm, 940 nm and The supply voltage for the DC to DC step down is 5 V from a smart phone charger then I will set it on 1.4 V exactly ...
- 1
2
votes
1
answer
772
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Switching regulator vs converter
Is there any difference between switching regulators and converters? I have read about step-down voltage regulator and buck converters and they seem to be the same. So, can I use the term converter ...
- 37
1
vote
3
answers
1k
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How to add 12V cooling fans to existing 48V circuit?
I have a 48V stepper running off a 240W supply, max current of the drive is ~4A. I am looking to add an 80mm cooling fan to this circuit. I know 48V fans exist, but 12V are more widely available and ...
- 13
1
vote
1
answer
2k
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What is the difference between buck and step-down converter
I always thought "buck" and "step-down" are synonyms. But now I'm looking at two datasheets:
CAT4201
CAV4201
They seem very similar, but the first is described as "350 mA ...
- 1,450
0
votes
0
answers
45
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Choosing an Inductor for MAX8792
I want to make sure I chose the right inductor value for MAX8792.
My step down converter should convert 12V to 1.8V while delivering maximum 3A at the output.
this is a schematic that was used to ...
- 1,097
0
votes
2
answers
37
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Setting the output voltage of MAX8792
I'm interested in using MAX8792 in order to create 1.8V primary voltage for Tiger Lake UP3 intel CPU.
I didn't find any formula that relates to the output resistor divider in order to set the output ...
- 1,097
1
vote
0
answers
774
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Buck converter (TPS54331) oscillating
I have designed and built a buck converter based on the TPS54331 which oscillates at 5.4kHz with an amplitude of 700mV peak-to-peak under a 1A load. I want to remove these oscillations.
Here is a ...
0
votes
1
answer
1k
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Understanding Power Good Signal in TPS54719
I'm using TI TPS54719 DC-DC and I'm trying to understand the PWRGD signal functionality.
Definition of PWRGD pin in datasheet: An open drain output, asserts low if output voltage is low due to thermal ...
- 1,097
0
votes
0
answers
48
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Replacing mic22705 buck converter with cheaper one
Since Microchip decided to increase their mic22705 price, my company decided to replace it with another synchronous buck converter. the current price we get for 20K units of mic22705 is 1.459$.
The ...
- 1,097
0
votes
1
answer
877
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Dc to DC converter: "split" one power supply (24V, 5A) into four power sources 5V, max 3A
I have one DC input 24V, 5A.
I have designed a 4 channel led driver using the PAM2804 for Cree RGBW leds.
I am using 3 of them. So, 3 Rgbw leds, and 3 led drivers.
I need to be able to control ...
- 3
0
votes
1
answer
660
views
5V to 3.3V what is wrong on my schematic?
I made a schematic based on the SY8089A1AAC(Datasheet)
My schematic(I tried with and without C8):
I soldered everything but the output is 0V(0.04V to be precise)
What is so wrong ?
It is part of a ...
- 125
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0
answers
225
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Input Current for Basic Chopper DC
I have a very basic question about the input current in a basic DC chopper. Following is a picture taken from the book "Power Electronics for Technology", by Ashfaq Ahmed.
Considering that ...
- 1
0
votes
0
answers
88
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DC to DC converter options
I'm admitting here that I'm a little out of my element, so take that into consideration.
I am working on a project that combines a few different electrical devices that use different DC power sources. ...
1
vote
1
answer
558
views
Buck Converter design, which is better? 48V->12V direct conversion or 48V->24V->12V conversion for 12V application
I am designing a 1KW DC-DC buck converter with Vin(51V battery pack with Vnom = 48V) for driving four 250W motors. Is it advisable to step down the voltage directly from 48V to 12V or should I first ...
0
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0
answers
121
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Would using step-up and step-down converters in the same circuitry damage the battery?
One of my projects, to be powered by 2S Lithium Ion batteries (7.4V), requires various voltages, such as 3.3V, 5V and 12V, to be derived using a couple of step-down and a step-up converter.
I am ...
- 11
0
votes
1
answer
472
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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 ...
- 35
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0
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66
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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. ...
1
vote
1
answer
1k
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Converting 5v PWM Noctua NF-A8 to 12v
I bought two fans for my PC case, but I accidentally ordered the 5V version of the fans. The box states that CAN'T be run on 12v of regular Motherboards or the'll die.
I happen to have a step-down ...
- 35
0
votes
1
answer
118
views
28V Stepdown with TracoPower TRN 1-2411 DC/DC converter for ESP8266?
Im new to electrical engineering. For a project I want to supply an ESP8266 with power by using a 28V Milwaukee Battery. My Question is:
Can i supply the esp at the VIN PIN using the 2411?
- 103
5
votes
2
answers
3k
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Cause for failure after short circuit Step-Down Converter Input
I'm currently evaluating the Semtech TS30042 step-down converter. My input voltage is 24V, output voltage is 5V. I followed datasheet recommendation in my layout in most aspects. The problem is, as ...
- 292
2
votes
3
answers
2k
views
How does using a DC-DC step down converter save power?
I understand how DC-DC buck converters save power when compared with a linear regulator, but do they save power when compared to not using power conversion all together? In my specific case, I have a ...
- 649
1
vote
1
answer
163
views
Issue with step-down converter feedback and where to place it
so I figured out where the buzzing is coming from in my circuit, and I think I'm starting to see the problem with it.
Here is a schematic I have:
The DC/DC step down converter I'm using: http://www....
- 143
2
votes
1
answer
512
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switching power supply pcb layout
I'm studying for the best practice to route a switching dc to dc step down regulator. Particularly this TI part.
On page 37 there's a layout example.
I was wonder if it could be any problem to place ...
- 2,074
0
votes
1
answer
974
views
Buck converter output current
I need to power an Arduino and four 4.5v-9v 2A Li-ion charger boards with a single wall adapter. Not wanting a shared circuit between the chargers, I'm thinking maybe a 12v 600mA (or something..) plug ...
- 117
2
votes
2
answers
125
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Step-Down convertor. Why does the input voltage go to the output
At the moment when I insert the USB cable, at the output of the converter, 5 volts appears for a short time. Why is this happening?
Circuit:
Voltage Oscillogram:
BUT! When I connect the ground ...
- 470
1
vote
3
answers
3k
views
Optimal design choices for mosfet driver for DC-DC step-down converter
I'm dealing with an application in which a DC-DC converter is used to transform an input voltage of 15V DC into lower voltages.
The current configuration makes use of an LM27222 with two mosfets in ...
- 1,045
2
votes
2
answers
2k
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Cooling buck converter mosfets by placing on bottom layer of PCB - a problem?
I have a design and layout for a buck converter which currently sits on one layer of a 2 layer PCB. I would like to force-cool the heat generating components of the board by placing them directly onto ...
- 133
5
votes
2
answers
2k
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Buck converter - Spikes on output at switching frequency
I've been using LT1158 to make a step down switching regulator.
I have an input frequency of 50kHz and this is my circuit
I put 22 Ohm 50 Watt resistor on CON1 as a load.
I got this output measured ...
- 53
0
votes
3
answers
284
views
Best design choice: linear regulator or switch converter
I need to power a Thermoelectric module with 10A maximum load current. I'm designing a card with a minimal design in order to change the current or the voltage across the load, given a standard ...
- 1,045
0
votes
1
answer
159
views
Any problems with double step-down conversion?
I would like to use this PMIC but the problem is the default values for the DC/DC and LDO converters are different than what I want to use. Unfortunately the custom OTP setting to get the values we ...
- 467
1
vote
1
answer
103
views
What is the most convenient way to make/buy step 66V DC down to 12V DC?
There is a big battery that I have which has 64-67 volts, and I need constant 12 DC volts from it.
I tried ebay, but the best buck converter that I found had limit of 55 volts. My local electronic ...
- 115
0
votes
2
answers
286
views
Mp2307 what is the maximum output current?
On the datasheet says minimum Upper Switch Current Limit at minimum duty cycle is 4.0A (min) 5.8A (typ).
How can i calculate the maximum output current? It will be higher or lower than 3A?
- 79
1
vote
4
answers
2k
views
What will cause if I put a larger inductor to a step down converter like MP1584 or MP2307?
For example my calculation for MP1584 inductor is 10uH, but i could put only 47uH to it. It is a problem?
I'm doing this wrong?
- 79
2
votes
3
answers
6k
views
What is the difference between monolithic and non-monolithic dc-dc converters?
What is the difference between monolithic and non-monolithic dc-dc converters?
For example this is monolithic dc step down controller: LTC3609
- 79
0
votes
1
answer
324
views
MP1584 step down short circuit efficiency
If I use MP1584 step down IC and short circuit appears how can I calculate the efficiency or the total power dissipation for the IC?
- 79