Questions tagged [step-down]

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2answers
53 views

When to use step up and step down transformer

Well I once saw a video in which a guy made a spot welder using a step down transformer and in another video I saw someone make arcer using a step up transformer. Why using a step up to jump arcs and ...
2
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2answers
186 views

Designing switch mode power supply (SMPS)

I've been trying to make a SMPS for sometime now but I can't get it to work. In my design it keeps killing the MOSFETs once I short the output with a thin wire that doesn't let more than around 20&...
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1answer
33 views

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 ...
1
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1answer
75 views

Why doesn't the TPS54360DDA work?

I tried to repeat the scheme for DS and general recommendations for the design of step-down regulators. My scheme: My PCB: It seems everything is designed correctly. But the TPS output gives 0V. (...
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1answer
46 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 ...
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1answer
50 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
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1answer
92 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 ...
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2answers
97 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 ...
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1answer
46 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 ...
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1answer
78 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
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1answer
52 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 ...
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0answers
65 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?
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2answers
91 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
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1answer
35 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 ...
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3answers
664 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
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1answer
35 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
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1answer
145 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 ...
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2answers
770 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
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1answer
49 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
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1answer
58 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
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0answers
70 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 ...
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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
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1answer
90 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
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1answer
294 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=...
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3answers
155 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
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4answers
587 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
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1answer
311 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 ...
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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
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2answers
285 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
347 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 ...
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3answers
114 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
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3answers
280 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 ...
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3answers
195 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
115 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
463 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 - ...
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1answer
35 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 ...
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1answer
32 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 ...
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4answers
545 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
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
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2answers
245 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
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1answer
34 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
74 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
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1answer
231 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
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1answer
403 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 ...
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2answers
123 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
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1answer
117 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 ...
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2answers
725 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 ...
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2answers
507 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
59 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
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1answer
35 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 ...