Questions tagged [step-down]

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10answers
2k views

Best approach to step down 220VAC to 160VAC?

Hey Electrical Engineers, I'm a newbie to electrical engineering (I am a software developer by trade and am starting to work with Raspberry Pis and want to learn about basic circuit design). My ...
0
votes
2answers
304 views

Current relationships across a voltage step down convertor

This question arose from a conversation over the weekend and we tied ourselves in knots trying to get to the bottom of it. I didn’t have time to put a simple circuit together so it would be great to ...
0
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3answers
873 views

high current buck converter?

I am in the process of building a power bank with 18650 batteries for a trolling motor. The nominal voltage for this battery is 14.8 V. The motor specs are 12 VDC - 45 A max current draw. Now the ...
1
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3answers
125 views

What is the best way to step my signal from 5V to 3V3? [duplicate]

I have some analogue signals between 0 and 5 Volts being fed from a multiplexer into another board that only accepts signals up to 3v3. What is the best way to step down the voltage? The signal ...
0
votes
3answers
513 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 ...
-1
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3answers
286 views

Voltage drop solution?

i just wanna start by saying i appreciate any help at all and am grateful for this forum! Also, the only electrical knowledge i have are that of self experimentation, no education except reading ...
0
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3answers
139 views

Simplest/Cheapest Way to Create 4.5A Test-Load for 12Vdc Step-Down Regulator

I'm looking for the simplest/cheapest (but safe!) way to build a 4.5A test-load for an LMR14050-based 24Vdc to 12Vdc/5A step-down voltage regulator circuit. LMR14050 Datasheet Circuit Schematics ...
0
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0answers
711 views

MOSFET for PSU switching

I want to make a Bench power supply unit based on: For initial AC to DC conversion - ATX PSU (Enermax EG365AX-VE 350W) capable of providing 12V 26A Internally Step up module for powering the below - ...
0
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1answer
37 views

Is it good idea to use more than two output from one step down converter?

I want to use below step down converter to change 24V to 12V. But I need to connect to two circuits which require 12V to operate. Will it be ok to do this? Should I buy another step down converter ...
1
vote
1answer
54 views

AC adaptor needed to power multiple devices

Basically working on a project, still in the conceptualizing stage, where I need to output power to 3 devices, 12v 2A, 12v 2A and 5v 2A, ideally off one ac adapter. I was thinking of using a dc to dc ...
0
votes
4answers
799 views

Will a 2000w Step Down Transformer be enough to safely power a Japanese Oven Toaster? [closed]

I recently acquired a Japanese oven toaster, with a maximum power consumption of 1000w at 100v, and I would like to use this appliance in USA. I was told that for safety reasons I should get a step-...
0
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2answers
45 views

Do stepdown transformers use their maximum wattage while in use?

I recently moved to Australia from the United States and brought a few stepdown transformers to make use of some appliances I didn't want to repurchase down under. I have a 2000W transformer that I ...
0
votes
2answers
308 views

Step down from USB (5 V) to 4.3 V for battery dummy

I have a camera for which I bought a dummy battery to connect it with power bank or other power source. Original battery is 3.6 V Li-ion so I need around 4.3 V but the USB (from powerbanks) is 5.1 V ...
0
votes
1answer
37 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....
0
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1answer
82 views

Driving/dimming/strobing 30 pieces of Cree XR-E individually via Rispberry Pi 3, powered by 18v 4.0mAh makita accu

I am looking for a solution to individually dim (or if not possible switch) 30 Cree XR-E LEDs driven by a 18v 4.0Ah Makita battery and a step-down converter to go from 18v to 3,5v capable of handling ...
2
votes
1answer
327 views

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 ...
0
votes
1answer
565 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 ...
-1
votes
2answers
174 views

build or buy buck converter

Hi I am looking to step down a 10 volt DC to 5 DC with low output current (less then 1 amp) Is it the best to build a buck converter or to buy it ready ? thank you Actually I am using an arduino, I ...
0
votes
1answer
186 views

Step voltage down safely for a LED

I have a 127VAC -> 24VAC transformer to power a project and I want a LED to light when my electronics is ON. I rectify it and pass through a smooth 2200uF ...
1
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2answers
1k views

Best way to power a 12V-2A load using 18650 Li-Ion batteries

I would build a small present for my friend's child who has a 3D pen like this: 3D pen link By now it only works with an AC-DC adaptor, so it always requires a wall plug. My idea is to build a ...
-2
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2answers
671 views

800-1000V -> 5V step-down regulator [closed]

I need idea to design 800-1000V to 5V 1W buck regulator. I have a very narrow space so I don't want to use flyback controller. Maybe monolithic ones. Do you know any ic or any idea?
0
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2answers
65 views

Dc-dc stepdown converters, NUC, servos and cameras

I am playing / built a mini robot of sorts - made from a 12v dc NUC slimline PC, 2x 7.5v 500ma servos, 2x 7.5vdc IP cameras , a 3vdc laser pointer and an arduino. I've got 4 different power supplies ...
0
votes
1answer
37 views

Hooking up AC/DC converter

the converter in question Hello for the converter in the link above when converting AC to DC should I have both inputs to the same AC source or do I just need one output connected? I have used the ...
0
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2answers
456 views

Using parallel inductors on LM2596

In the datasheet of LM2596, 33uH or 47uH inductors are recommended for 5V output. I can't find any high amperage inductors of those values. So that if I use 100uH of 2 inductors in paralell(they will ...
0
votes
2answers
695 views

Regulating LM2596 Module output to 5V

I am using LM2596 Step Down module to regulate 12VDC to 5VDC on a pcb board. The board specs are: Voltage = 5 VDC Current = 3 Amps Normally the setting on the module will be correct and the output ...
-1
votes
3answers
349 views

2kV AC step down to 5v without using transformer [closed]

I'm doing an industrial project, i need to step down the high voltage of 2kV to 5V, is it possible to step down to around 5V without transformer, is there any other alternatives? please suggest me :)
0
votes
1answer
60 views

Can i wire a pump with 2 Voltages like this?

so i wanted to reduce the speed of my water pump but i feared that the 7-8V might be to low to start it up. So i thought starting it at 12V and then switching it to 7-8V should do the trick. Main ...
7
votes
2answers
8k views

Is it possible to step down 240 AC to 5 DC without transformer?

Microcontroller which is controlling mains voltage circuit requires 5 volts to operate. Is it realistic to use diode bridge followed by capacitor to straighten the ac wave and then use voltage divider ...
6
votes
1answer
699 views

Drop voltage a bit

I have this ATtiny13a mcu led setup that uses total of 33mA when both leds are on and it works perfectly when powered through usb output. My problem is that now I want to power it using a 6V 500mA ...
2
votes
2answers
104 views

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 ...
0
votes
2answers
125 views

Voltage step down from 12V to 3V3 for cDAQ module

I am by no means an electrical engineer, so I'm guessing that there is a pretty simple solution to this problem and I'm just being thick about it. In general, I want to read the voltage of 4 ...
0
votes
1answer
41 views

Need help understanding my voltage measurements

I have a device connected to a power source (2 AA batteries hooked to a DC-DC step down buck, set to 2.5V). When the device is connected, I read 2.2 V on the output of the buck. When it is not ...
4
votes
1answer
1k views

Ground fault protection for fault on delta side of a wye-delta step down.

I have a distribution circuit with a primary 4-wire 21 kV and secondary 3-wire 12 kV circuit. The two winding transformer is a (grounded) Wye-(closed) Delta transformer. I know that if I have a ground ...
1
vote
1answer
357 views

buck regulator power draw

I have a circuit, Arduino Leonardo clone, which I'm attempting to power with a buck regulator. Specifically, I'm using a DSN MINI 360. It's based on the MP2307 buck regulator. If I power my board ...
0
votes
2answers
901 views

Does a step-down voltage converter draw its maximum wattage

I purchased a step-up/step-down voltage converter to use my 110-120V electronics in countries with 220-240V wall sockets. It's similar to the one pictured below. These transformers are sold in a ...
-2
votes
2answers
241 views

Modify The Circuit

EDIT: I want to produce +12 Volts as well as -12 volts output. It would be very helpful if someone can suggest changes in component values keeping the structure same. Thanks in advance.
0
votes
3answers
1k 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 ...
0
votes
2answers
127 views

Resistor divider on current sense signal

I am building a step down converter using LTC3892. It will have 12V output sourcing 50A in each of two interleaved phases. Problem is that LTC3892 has fixed current limit value at 75mV. This means ...
1
vote
1answer
283 views

Step down transformer 220Vac ~ 380Vac

I have a 10W AC/DC converter that works in the range of 80~265Vac and I was using it with an input of 220Vac, but now I need to supply with 220Vac or 380Vac. I was thinking about using a step down ...
3
votes
3answers
1k views

Step-Down/Buck-Converter: How to replace feedback voltage reistor divider to electronically control the regulator output voltage

Most today used switching regulator ICs that I've seen have some kind of feedback voltage pins. I think I've pretty understood the way it works: A resistor divider from output to ground is created to ...
1
vote
1answer
2k views

AMS1117-3.3 from 5VDC show 0.09vdc

Hey all I am having an issue using this AMS1117-3.3 SMD: According to its documents it says its either a fixed or adjustable version? So I hook it up as I see in the documents: The left pin (1) ...
2
votes
2answers
749 views

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 ...
1
vote
3answers
550 views

Understanding a variable 220v AC to DC Power Supply

Can someone just please explain how and why the diodes D3 D2 and D4 are used? Why D3 is single while D2 and D4 are in series? How do we calculate the capacitance of capacitor required in a circuit ...
0
votes
2answers
2k views

Step down transformer voltage between neutral and ground

I just decided to test the voltages in my old tube guitar amp against the schematic. I live in Australia and it's a US amp, so I use a separate 240-110v step down transformer to run the amp. Upon ...
5
votes
2answers
841 views

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 ...
0
votes
1answer
21 views

LXE-HX2i decrease battery voltage, step-down converter

Hello, I got this battery and I want to decrease it's voltage output. Can I just use cheap step-down converter with LM2596 onboard?
0
votes
1answer
106 views

Horn disturbs controller and lcd on common power source

I have a 60V battery which feeds a PCB itself switching down the voltage to a 12V bus and then from 12V to a 5V bus using two consecutive TI TPS54560 switching regulators (5A max current). I have a ...
6
votes
3answers
9k views

Do Step-Down Transformers Increase Total Power Consumption?

Firstly I am not at all experienced in electrical matters so forgive any wrong terminology. Here's the situation: I recently moved out of US to a country that uses 220v. We have a single phase step-...
0
votes
1answer
3k views

Step down transformer for a 1 HP Kitchenaid mixer

Hoping I can get some feedback here. I've been bought a really nice Kitchenaid mixer (110v/60hz) from the US as a gift...However, I live in South Africa where the voltage/frequency is 220-240v/50hz. ...
0
votes
2answers
393 views

Reduce voltage to many lower output with resistors

I have a stable dc 12 volt input 2 Amps and i want to make 6 different exports out of it like a power suply. I would like to make the six reduced outputs out of it : 12v as i get it from the input,9v,...