Questions tagged [step-down]

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2answers
38 views

Converting 12 Volt Lipo to 5V with Buck Convertor

I'm trying to power a large bank of LEDs that require 5V at 5 amps. I plan to use a 12v hobby Lipo attached to a buck convertor to step that down. I also need to power a teensy microcontroller with ...
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2answers
61 views

Do I need to include overhead when picking a power supply?

I need to power 40 Raspberry Pis, each requiring a 5V input and have a maximum current draw is 2.5A. This would mean: 5 x 2.5 = 12.5W 12.5W x 40 = 500W That I ...
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2answers
74 views

Step down transformer when wattage is close

Please tell me if my cooking appliance (programmable pressure cooker/slow cooker) is safe to use with my step-down transformer. I live the UK and received a Japanese cooking appliance. I have a step ...
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0answers
48 views

How to reduce noise Buck converter at constant current mode ACT4088

Hello i am using a ACT4088US-T (datasheet here) Buck converter and i made it to run in constant current mode 500[mA] through a Diode (D5): Everything works fine. It draws 500mA no matter the load i ...
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0answers
51 views

DC to DC converter options

I'm admitting here that I'm a little out of my element, so take that into consideration. I am working on a project that combines a few different electrical devices that use different DC power sources. ...
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1answer
67 views

How bad is it to momentarily overload a transformer? [closed]

I have an espresso machine from the US running on a transformer in the UK. Inside the machine there is a grinder, a pump, and some heating elements. The machine is labeled 120VAC 1150W. I have it ...
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1answer
67 views

I designed a circuit to receive multiple AC voltages at the input and constant voltage at the output, but I wonder if the circuit makes any sense

I wonder if this circuit has any meaning and if it will work as I expect. I would like to know before I build it, due to lack of time. What I want from this circuit is to give motorcycle lamps the ...
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1answer
71 views

Buck converter alternative 12V --> 3V

I'm looking to reduce a battery supply voltage into a LILYGO T-Call and don't have a buck converter but do have lots of resistors and a few other components at hand. I'm ideally looking for the ...
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3answers
72 views

Will a step-down module increase amps and keep power supply steady on other 'branch'?

I don't know much at all about electronics, so this is a very basic question that I'm struggling to figure out, even with the help of Google. So the scenario I want to achieve is this: I have a 12V/...
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0answers
27 views

GND connections with MP1584 DC stepdown

I am going to use an MP1584 stepdown to convert 9v battery to 5v to power a STM32F411CE board. And a second one to power two 6v n20 motors. Learned that I always have to connect GND from all ...
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1answer
69 views

1200W, voltage and cycle converter 220 to110

I have bought a Joule sous vide immersion circulator from USA. I want to use the device in India. I need to convert AC, 240V 50Hz to 110V 60Hz. After reading the literature on the company's website ...
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6answers
893 views

Step down converter LM2596 with voltage spike on output when powering up, destroys subsequent circuits

I use this step down converter with input 30V DC and output set to exactly 5V. At the output I connected an ESP8266 (WEMOS D1 mini, has 3.3v regulator on its board) and an MP3 player module (DY-SF5W.)...
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0answers
25 views

Step-down as LED driver leads to flickering

I received a LED driver board that uses an A6902D step-down as regulator. Here the schematic of the driver section: PWM_3 is the signal from the MCU: 500 Hz (tried ...
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3answers
100 views

Step down 9-36V to 5V: Best and cheap way to power a Raspberry Pi

I've seen a lot of solutions across the web: MP2307, OKI-78SR-5, LM2596 and so on. I have to power a Raspberry Pi 4 that draws around 1.8/2A in a smart and effective way (low ripple, extended range ...
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1answer
40 views

Stepping down DC - maximum current capability

I'm looking for a bit of a sanity check here (I'm a hobbyist) -- I want to use a 12v regulator capable of outputting 600mA It's required that it be able to provide enough current to power a 12V to 5V ...
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2answers
97 views

How to convert Li-ion battery voltage to 1.5 V?

I want to use Li-ion batteries to power devices that work with AA (1.5 V) batteries, to have best autonomy and to be able to recharge it easily (using a battery manager module). I had thought of a ...
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0answers
55 views

How to bypass step-up voltage converter?

I bought this great solar panel unit on amazon that has lithium batteries, 12v input and 12v output. I use it to power a 5v ESP8266 and I have a step down voltage converter from 12v to 5v on my end ...
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0answers
210 views

Better lm2596 alternative

i am currently working on a small robot (Raspberry Pi 4, Arduino Mega, a few smaller sensors, 2 motors (each about 0.3A) and two smaller servos. My problem now is that the Raspberry Pi crashes as soon ...
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0answers
126 views

Charging internal laptop battery bypassing board

I own a refurbished tecrq z50a and during a routine clean up i did a mistake of taking off the bottom cover without realizing that it was still shutting down. A screw rolled on the board and sparks ...
1
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1answer
72 views

Buck Converter design, which is better? 48V->12V direct conversion or 48V->24V->12V conversion for 12V application

I am designing a 1KW DC-DC buck converter with Vin(51V battery pack with Vnom = 48V) for driving four 250W motors. Is it advisable to step down the voltage directly from 48V to 12V or should I first ...
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0answers
44 views

Would using step-up and step-down converters in the same circuitry damage the battery?

One of my projects, to be powered by 2S Lithium Ion batteries (7.4V), requires various voltages, such as 3.3V, 5V and 12V, to be derived using a couple of step-down and a step-up converter. I am ...
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1answer
76 views

Need help identifying components! Hardware

So recently I have come across a schematic diagram with pictures, but some of the parts in the build (A quadruped robot, more information in the hackaday link below) are not in the schematic, and I ...
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0answers
35 views

P-MOSFET power dissipation spike when turning off (10 - 100khz)

I designing battery charging circuit, I found the following step down converter for charging. The target is to charge a battery with 3-4 A, but the P-FET (NTF2955) becomes very hot at 0.5 amps: I ...
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1answer
26 views

Determining \$I_{peak}\$ and \$f_{min}\$ and \$f_{max}\$ for MP4569 buck IC

Trying to figure out what inductance value is needed for my application of MP4569. They give the minimum inductance value in terms of \$I_{peak}\$ (page 12): \$L_{MIN}={{V_{IN(MAX)}{\times}t_{ON(MIN)}}...
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0answers
25 views

Constant Voltage Power Supply

I’m working on a project were I need to power to some 24V 4-20mA sensors, a 3.3V ESP32 and a 5V SIM808 module. To accomplish this I’m using a step-down buck converter to reduce a 12V electrolytic ...
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0answers
58 views

Isolated step-down module for powering a Raspberry Pi from a speaker's 12V supply avoiding ground loop and interference

I have an older speaker with an iPod dock that I would like to extend with a Raspberry Pi as a streaming music player. At first, I tried powering the RPi from the dock connector with a Micro USB ...
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0answers
44 views

How to determine if I broke a low-dropout linear regulator

I recently bought a cheap relay shield for an ESP8266 (01, the small ones.) These shields can be powered with up to 15V and contain an ET1117-3.3 voltage regulator on it, to properly power the ESP at ...
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1answer
65 views

Simple 24V high current voltage limiter

I need to power my Sure JAB 3 250 amplifier from two 12V lead batteries in series, but the recommended maximum of the amplifier is 26V and the charging voltage of the batteries will be 28.8V. What ...
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1answer
46 views

Simulate Step down chopper circuit using any Electrical Engineering software

Here's my attempt: Could someone tell me where is my mistake ? Or simulate answer the question using any other software,please ?
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2answers
92 views

Relocation US to Germany: step-down transformer for TV, AVR, LED lights and other devices? [closed]

I hope this is the right place to ask this: I am relocating from the US (110V 60Hz) to Germany (240V 50Hz) and want to bring some of my electronic devices. It seems worth the hassle in my case (not ...
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2answers
42 views

What happens to step down converter effiency when current consumption is very low

I'm planning to use a MAX640 (Maxim 9 V -> 3.3 V Step-Down DC-DC Converter) to supply a couple of ICs with 3.3 V. In active mode the current consumption of the ICs are around 20 mA and according to ...
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1answer
126 views

Using voltage regulators for a computer harddrive

I've got an Intel NUC (NUC8I3BEH3) that's using its own 19V, 90w power supply (pictures). After a few issues with 4TB 2.5" hard drives, and external USB disks, I'd like to use a 3.5" drive, but the ...
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2answers
124 views

Limiting input voltage for buck converter

I want to power some micro controllers and a couple of leds on my electric bike, counting up towards 5 Amps. Power supply is a 36V battery, with a range of about 42V to 33V. This voltage is to be ...
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2answers
80 views

Step down 3 phase 2kV AC to 3-12V at modest current (5-20mA max)

I'm looking for a way to step down 3 phase, 2kV AC power to 3-12V DC. I do not have a neutral, just the 3 phases and ground. This will be entirely isolated, nobody will be anywhere near this thing. ...
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2answers
46 views

Can a transformer output current be controlled by a current limiting switch on the input?

I have a step down transformer, input of 220/40v, however I need to vary the current on the output. I understand that by varying the voltage (using a device such as a Variac) on the input I could ...
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2answers
66 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 ...
0
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1answer
30 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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0answers
32 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
73 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 (...
0
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1answer
123 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 ...
0
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1answer
72 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 ...
1
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2answers
109 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....
0
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1answer
180 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
72 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
114 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
96 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 ...
6
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3answers
2k 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 ...
0
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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. ...
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2answers
166 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
79 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 ...