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Questions tagged [step-down]

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2
votes
2answers
687 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 ...
-1
votes
0answers
15 views

Suggestions for utilizing a lithium-polymer battery to power a microprocessor and approximately 5m of 144 LEDs/m?

I do apologize if this may be asked by someone else in a different context but as someone with no prior knowledge or understanding of electrical work, I may have overlooked and overthought about my ...
0
votes
1answer
44 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
45 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
61 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
2answers
54 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
81 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
1answer
249 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=...
1
vote
3answers
95 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
557 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
150 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 ...
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
263 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
votes
2answers
94 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
vote
3answers
110 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
181 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
votes
3answers
130 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
105 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
296 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
votes
1answer
33 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
23 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
388 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
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
2answers
155 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
28 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
66 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 ...
1
vote
1answer
186 views

switching power supply pcb layout

I'm studing for the best practice to route a switching dc to dc step down regulator. Especially this TI's part (http://www.ti.com/lit/ds/symlink/tps54340.pdf). At the page 37 there's a layout example....
0
votes
1answer
285 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
97 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
92 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
vote
2answers
445 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
votes
2answers
369 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
votes
2answers
54 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
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 ...
0
votes
2answers
210 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
464 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
256 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
57 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
5k 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
602 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
94 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
77 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 ...
3
votes
1answer
882 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
253 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
414 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
162 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
758 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
92 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
212 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 ...