Questions tagged [step-down]

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2answers
65 views

12 V to 5 V with highest current possible

I have a 12 V, 14 A DC power source and I would like to step it down to 5 V DC with the least amount of loss of current. Theoretically, by stepping down to 5 V is should be able to get as much as 33 ...
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1answer
26 views

Swapping a step down converter

I have a faulty graphics card i am trying to repair, i noticed on the back near the 12v connector that a step down converter in Q501 had a leg missing (right side, second from the bottom) and i am not ...
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1answer
110 views

Using LM2596 step down with LiPo

i'm doing a project with esp32 (3.3v), dht11(3v-5v), soil sensor (3.3v-5v the cheapest Chinese), nrf24l01 (2.6 - 3.6v). I'm using lifepo4 right now (3.32v) but when the battery drop about 3v, soil ...
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0answers
21 views

2 SMPS connected together for ground shifting

I have two SMPS of same manufacturer. FOLLOWING ARE THERE DETAILS: MANUFACTURER: Maa-Ku MODEL: S-24v-5a INPUT : 240V AC OUTPUT : 24V 5A DC WATT : 120 W Product link: https://www.amazon.in/gp/...
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2answers
68 views

Is the transformer's secondary winding too large?

I recently took out the windings from an old microwave oven transformer and was planning to use the core for a 120 to 6.3 VAC step-down transformer (total power 160 W max). The secondary winding (...
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1answer
71 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 ...
5
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2answers
670 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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1answer
43 views

Forking a 3 phase 380V line into three 220V single phase?

I need to feed several loads with single phase 220V AC, namely: Four 60V DC transformers rated 350W 5.9 amps. One VFD transformer connected to a 8 amps motor. Could I connect everything over a 3 ...
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3answers
516 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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1answer
379 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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2answers
82 views

MCP16301 fail on power up - Vin shorted to Vout

I have designed a step-down converter PCB (4-layer) with MCP16301. It converts voltage from 24V to 5V. When I connect it to power source and then connect a 100ohm resistor (50mA@5V) it works normally....
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0answers
30 views

How can I calculate the power capacity of a AC to DC converter?

This seems off topic, but will explain why I need to do what I am doing. I'm currently homeless, but need to build a generator on the cheap. I have a camper that uses 30a service. I have an ...
0
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1answer
77 views

Step down transformer vs Electronic voltage regulator for appliances between 220v to 110v [closed]

I recently purchased an Instant Pot 6 Quart with specs(Electric Pressure Cooker) from the US(outlet supply 110v) and would like to send it to a country that has outlet supply of 220v. The cooker is ...
0
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1answer
49 views

Load RMS voltage of a bridge rectifier

I was given a homework assignment shown below and I have a few quick questions that I appear to be stuck on. Any help would be appreciated. I can get Part i) and the answer is 168.64 degrees. Part ...
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1answer
105 views

Is this circuit correct?

I need to know if this circuit is efficient to transfer most of the current from several identical independent 2 phase dynamos. The converters are all the same and ideal for the voltages no problem ...
3
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2answers
82 views

One step-down regulator 24 V to 1V or two step-down regulators with lower steps?

I am trying to design a working principle scheme to step-down the input voltage from 24Vdc ---> different low voltages (1.8 V, 1 V, 1.5 V, 3.3 V with ripples ~ 1%). Could you kindly explain me the ...
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0answers
52 views

LM2574-5.0 Voltage Drop by 1/2 v (2.5V) instead 5V

I have a problem with an LM2574-5.0 that only gives me half ( 2.5V instead 5V) the voltage needed when loaded. I looked for a circuit on the net with good filtering, because the circuit will be ...
6
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3answers
735 views

Simplest way to reduce voltage from ~48v to ~36v

(I'm very much a beginner with electronics, so I apologise in advance) I’m trying to use a 48v battery on my 36v ebike controller. The controller itself can deal with the higher voltage, but it has ...
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0answers
54 views

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. ...
6
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4answers
1k views

Converting 8V AC to 8V DC - bridge rectifier gets very hot while idling

I am tinkering with an Arduino and recently had to convert 8V AC to 5V DC in order to run it. The project is a custom doorbell, which gets the power from the doorbell transformer (transformer is ...
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2answers
66 views

Mosfet Regulator heating issue

Guys i trying to step down voltage using mosfet. Application: Input battery supply 40 to 50 volt Output voltage is 12 volt not more than 500 ma. Mosfet heating issue due to... Since the mosfet is ...
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2answers
60 views

Transistor series regulator heating

Hi friends i am trying step down converter using transistor. Application: Micro controller power-supply = 3.3 volt Input battery supply range = 10 - 13 volt So i use BD139 for stepping down ...
0
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1answer
47 views

dimmer on input of stepdown transformer for amp regulation?

If have a step-down transformer designed for low voltage high amps, and I put a dimmer on the input will that allow me to lower the output amps? I don't care about voltage as it will be negligible, I'...
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3answers
881 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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0answers
63 views

Can any of the below damage a SIM800L module?

I was developing a simple circuit using an Arduino pro mini and a SIM800L when I understood that SIM800L's Vcc and Gnd pins have been shorted. I tested short circuit using the continuity and resistor ...
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5answers
111 views

Detecting if 120v AC wire is live with a 2 or 3 VDC line

For a background, I have 3 DPST bistable (latching flip-flop) relays that I have 120VAC input and 2 outputs. On one side, I have a 120VAC appliance. On the other side I need to find a way to feed it ...
0
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1answer
173 views

How can I interface with arduino mega2560 to detect the presence of a 48 V without pulling down the voltage by more than 0.1 V

How can I interface with a microcontroller to detect presence of a 48 V supply with a source impedance of 10 kΩ without pulling down the voltage by more than 0.1 V? I need to step down the output ...
0
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2answers
68 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 ...
4
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2answers
300 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&...
2
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1answer
4k views

How should I step down 220V (ac) to 180V for a DC motor?

I have many treadmills motor of rating 180V 10A which I would like to use for power tools. Locally we have 220V ac 50Hz. I thought of using iron-core transformers. But having one for 1800W+ is ...
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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 ...
1
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1answer
173 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
90 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. (...
0
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1answer
56 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
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1answer
328 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
65 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
221 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
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2answers
161 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
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1answer
47 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
83 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
79 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
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0answers
136 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
258 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
38 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
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3answers
3k 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
85 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
710 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 ...
2
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2answers
1k 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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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
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1answer
55 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 ...