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Questions tagged [step-down]

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0
votes
1answer
28 views

Is it possible to determine a low power isolation transformer maximum output current?

I have a transformer (no codes) 240vac to 12vac this is easy enough to determine but what about the maximum current? 1) I could load it until the voltage drops but to what exactly? 2) Is there any ...
2
votes
1answer
220 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
45 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?
2
votes
1answer
80 views

Will a buck converter allow current to pass through if Vin is less than the configured output voltage?

In general, will a buck converter allow current to pass through if Vin is less than the configured output voltage? Specifically, I'm reading the TPS54308 datasheet and I'm not seeing an answer to my ...
1
vote
2answers
85 views

How to efficiently trigger QC and convert it to constant 5V and a peak of 5A?

Introduction For a university project I started working on RGB LED Shutter glasses, which are based on the idea of a kickstarter by Macetech. However, these glasses miss some features I was looking ...
0
votes
1answer
43 views

How to measure available amps? Do i need more load?

My new 200W 18v 11a(max) solar panel reads about 24v 4a 50% efficiency at midday on my MTTP Rich solar controller. I presume this is not great. I was wondering... I have a 48v to 12v stepdown ...
0
votes
1answer
74 views

built in charge controllers take amps they need?

Many devices have built in charge controllers that stop charging when battery is at 100%. I read several places that you can charge devices with the manufacturers recommended voltage and that higher ...
0
votes
1answer
47 views

Splitting laptop power supply to charge 3 NiMH battery packs, how to protect from overcharge?

I have a 20V 2.25A laptop power supply that i want to split 3 ways to charge 3 X NiMH battery packs simultaneously (5000,2000,2000 MAh each @ 7.2V). My plan is to use 3 of these XL-4015 dc to dc ...
0
votes
0answers
43 views

How to calculate fuse size for primary coil?

How do you calculate fuse size for primary coil? I have an 230V AC to 18V DC. What are the steps please?
0
votes
2answers
77 views

LM2596 output and input [closed]

I am using an LM2596 module with my project because it has a good efficiency and a stable output voltage. My question is about the potentiometer found in the module. Does it select the output ...
0
votes
2answers
238 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 ...
0
votes
1answer
34 views

Step Down Voltage Converter with Commutator motor

I got a leaf blower which I bought from Japan and intend to use it in Thailand (220V => 100V). I found a step-down converter which can not be used on electronic stuffs. (the blower runs on motor only ...
0
votes
3answers
286 views

How to convert 5v to 1.5v?

I am a newbie. I have a power bank which gives 5 v output from a USB. Now I need to step down the 5v into 1.5v to run a small motor. I have searched a lot to find any readymade IC... But unable to ...
0
votes
1answer
28 views

Mini 360 DC Buck Converter [closed]

I have bought several DC Buck converters for my home-made 3D printer. I'm running a 24V PSU, but my fans are Noctua (12V) ones. So i want to convert 24V down to 12V. And the Voltage output works fine. ...
0
votes
2answers
208 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
90 views

Maximum current input of an LM2596 step down converter

I begin in electronic, so sorry if my question is bad. Can a LM2596 step-down converter accept 12V 8A as input ? I can read everywhere that the maximum output current is 2A or 3A but nothing about ...
0
votes
3answers
227 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
vote
1answer
275 views

TPS63070 Buck-boost not bucking or boosting correctly

Can some check my layout since I am using TPS63070 buck-boost regulator and I would like to get 4.7V output at TP12 but I am getting 11.5Vwhich is wrong and don't know why? Base on the Datasheet R1=...
2
votes
2answers
729 views

Is it possible to convert 19.5V 3.33A to 12V 5.5A?

I have a laptop charger which has 19.5 V 3.33 A output. I want to use it for raspberry, which needs 5V and 2.5A and for monitor which needs 12V 3A. Is that charger strong enough to run the whole ...
0
votes
3answers
1k views

Differences between bulky vs compact AC Step Up & Step Down solutions for high power loads?

So, I was considering buying an Electric pressure cooker to use through my global movement. The following advise was given to me. WHY? For safety reasons (meaning, if you want to be certain that ...
0
votes
1answer
46 views

Wanting to power small audio amp toy with usb power bank

It uses 3 AA batteries but I'm looking to determine if I can either just use the usb 5v or find a plug & play method to adjust the voltage down half a volt. I say plug and play because while I'm ...
1
vote
1answer
53 views

Is it acceptable to replace 2 parallel 100uF capacitors for LM2596 with two 220uF capacitors

I have a printer motherboard with the LM2596 IC. The older version of the motherboard had one 100uF capacitor at the output pin of LM2596 but LM2596 recommends that 220uF be used. Because a cheap ...
1
vote
0answers
67 views

DC-DC buck output voltage

I am designing a DC-DC step-down converter (asynchronous) and I would like to achieve a Li-Po charging with it (18 - 22 V input voltage). My goal is the CC/CV charging but to do this, I need constant ...
0
votes
1answer
2k 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
59 views

Calculating the oscillator frequency

I am trying to calculate the frequency of the internal oscillator, in order to go through the design procedure listed in the datasheet. The problem is that it gives me answers that contradict the ...
0
votes
1answer
87 views

Correct power supply for my project

I am making an autonomous bot where i need to power a few sensors (IR, PIR, sonic,etc) and an arduino. In total the sensors draw about 300 mA current(max). My power supply is a LIPO of 12 V (11.1 V),...
1
vote
2answers
625 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 ...
1
vote
3answers
126 views

How many capacitors are needed for a step down circuit?

I'm tyring to build my first step down component using TPS562219 to get 5V output from a 12V input (instead of 1.05V output shown in the example). But as I'm new to this electronic stuff, I have some ...
3
votes
4answers
568 views

Heat problems when using 5 buck/switching converters in a double isolated enclosure?

I want to use 5 step down converters (220 VAC -> 5V DC) inside an enclosure inside an enclosure (double isolation). The step down converters are similar to these. There will be 5 of them, where one ...
3
votes
1answer
225 views

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 ...
1
vote
1answer
1k views

How to build a variable input Voltage Power supply

The following shows a simple regulated transformer supply This unit needs 230 Volt Input to produce 5 Volt. But I'd like to build a power supply that can handle both 120V and 230 Volt. Like this one ...
5
votes
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
281 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 ...
1
vote
3answers
112 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 ...
-1
votes
3answers
174 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
votes
3answers
111 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
votes
0answers
418 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 - ...
1
vote
1answer
233 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 ...
1
vote
3answers
459 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
1answer
34 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
29 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
486 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-...
5
votes
3answers
6k 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-...
3
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 ...
0
votes
2answers
44 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
1answer
32 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
votes
1answer
71 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 ...
0
votes
1answer
344 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
110 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
101 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 ...