Questions tagged [step-down]

For questions about stepping down voltages. Consider using in conjunction with related tags such as "dc-dc-converter", "buck", "transformer", "ac-dc", etc., if applicable.

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I am looking for a 5V DC-DC converter that I can use in industry [closed]

I am developing an industrial project as an amateur. I am designing a system consisting of ESP32, Nextion HMI, Barcode Scanner, Sensors. The system draws about 1.5A of current. So far I have been ...
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1 vote
2 answers
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Improve thermal effeciency of buck LED driver with fixed supply rail

I have this driver circuit that uses an ILD8150: There are two identical sections of this module on my PCB. One powers 6 LEDs the other powers only 2 LED. The Vf of the LEDs is 2.85V @ 350 mA. So the ...
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Step down from 24V to 12V to drive 12V pump causing 30V back to supply [closed]

This is strange situation, where main power is 24VDC from adapto. Then, I need to drive 12VDC pump and I decide to use step down module adjust to 12V and connect direcly to that pump. The 30V DC just ...
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Step-down conversion materials

I have an ac adapter on which I would like to reduce the output, from 24 vdc to let's say 6 vdc. What type of diodes should I use and how many? What about heat dissipation?
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Need to power an AC Motor from either 120VAC or 220VAC

I am trying to modify a convection oven into a solder re-flow oven. One of my design requirements is it needs to work on both 120VAC and 220VAC (I will need to use it in the USA and over seas). ...
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1 answer
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Step down buck converter - lower input voltage than output - LM2596

I want to power 5v leds from a 12v source in my car using a "DC-DC Adjustable Step-down Buck Converter LM2596 3A". The source has a dimmer switch which can regulate the voltage from 12v to 1....
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Configuring a 2:1 stepdown transformer for efficient "solar charging" of an EV from a small PV array

What is the best way to configure a isolating 2:1 stepdown transformer, so that an EV can be efficiently charged (using a mode-2 EVSE which has a built-in RCD/GFI) without drawing more than 1 kW from ...
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2 votes
2 answers
62 views

12 V initial to lower voltage continuous step-down circuit

How do I design a step-down circuit that hits 12 V initially, but then drops the voltage for continuous use until turned off? I have a line lock solenoid that requires 12 V to activate. The ...
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Is this the right way to power a 12V LED and Raspberry Pi from the same 12V power source?

So I am trying to control an LED with a Raspberry Pi. It's a 12V LED, and the RPi needs 5V. From the research I have done so far, it looks like a good way to do this would be to use the GPIO port on ...
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2 answers
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Convert 12V PWM to 5V for Arduino input (ZigBee LED controller)

I got this ZigBee controller. The output of which I assume a 12V PWM signal because of the 12V LED strip you can connect it to. I want to connect it to my Arduino input. This way the ZigBee ...
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3 answers
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Double Bridge-Rectifier Circuit Question

I am up to building a NE555 controlled PWM circuit that will power a 220v heater. NE555 will use a typical configuration and will drive a 20N60 Mosfet. The mosfet Vgs(th) is 10v, so NE555 needs to be ...
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2 answers
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DC motor : dc-dc converter vs PWM

In a cave we are currently exploring, we are currently blocked by a small siphon, we would like to empty into another gallery. For this, I would like to use a 12V pump (not selected yet). As a power ...
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Defining VIN trace width of DC\DC

I intend to use RT8068A in the following design: The requirements are: Vin = 3.3V, Vout= 2.5V, Iout_Max = 1A (+VPP is connected to DDR4 Memory SODIMM-260, 32GB, 2400MHz/2666MHz, 1.2V). My question is,...
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Step down 5V Power supply for IoT

I am trying to create common DC power supply to support ESP32 Development board, Servo Moter (MG995) & Fan Motor (0.2A), all required 5V DC. I am considering Hi-Link 5V 4A SMPS Mini PCB Mounted ...
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LM3150 Webench not matching with LTSpice?

I'm trying to implement this design from Webench (5V @ 10A): I'm using LTspice to simulate this design, but my results are bizarre, as shown here: I have looked into this thread: TI Webench and ...
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1 answer
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Overheating Arduino Nano: decoupling capacitor advice

I've put together a circuit to control two LEDS (datasheet) with two Picobuck LED drivers (product page, datasheet) controlled by an Arduino Nano clone. I'm powering the Picobucks with a 12V 5A power ...
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How to spec input power of step down converter

I want to know how to spec a step-down converter that I am going to use for a project. The output voltage of the step down is 12V DC and the max current output is 2.5A (the load pulls about 2A). The ...
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Step-down converter in an ATX PSU, why?

I was recently looking at a 500W PSU schematic, and found out they used step-down converters on 12v and 5v output. Schematic is attached(pls see hi-res at https://ibb.co/nbDRJPq) The D2 diode charges ...
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-1 votes
2 answers
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Efficiency of MP1496 Synchronous Step-Down Converter at 1mA

I'm curious of what efficiency I can expect from MP1496 Synchronous Step-Down Converter (https://www.monolithicpower.com/en/mp1496.html) at 1mA, assuming 12V in and 3.3V out. Datasheet doesn't show ...
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4 answers
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what is the difference between 100 W and 1000 W step down transformer?

I need a transformer of 1350 W and just realize that it is very expensive compared with one of 30 W. What is the physical difference of transformers from 220 to 110 V of 100 W and other of 1000 W? Or ...
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-2 votes
1 answer
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Can I use DC-DC step down converter on infrared illuminator LED 5 mm, 940 nm [duplicate]

I was thinking if i use dc-dc step down converter on infrared LED 5 mm, 940 nm and The supply voltage for the DC to DC step down is 5 V from a smart phone charger then I will set it on 1.4 V exactly ...
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2 answers
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How does the current drawn from a battery change when it is stepped down using a regulator?

I'm wondering what happens to the current when the voltage is stepped down using a regulator. here is the situation: I have a load which draws about 500mA at 3.3 volts, and I would like to regulate ...
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5 votes
3 answers
2k views

Is this power supply universal input voltage? [closed]

I have this Playstation 2 power supply which was originally run at 110V input. A fellow member of this forum suggested that there might be a good chance that it could a universal input voltage and ...
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TPS53627 - Pin details and connection

I am trying to use TPS53627(https://www.ti.com/lit/ds/symlink/tps53627.pdf?HQS=dis-dk-null-digikeymode-dsf-pf-null-wwe&ts=1628703320954&ref_url=https%253A%252F%252Fwww.ti.com%252Fgeneral%...
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Buck / step down voltage in limited space

I am designing a small PCB. The supply voltage is 12V, but I also need 5V with supply of maximum 250mA. The most obvious solution is to use voltage regulator - there are plenty of them and some like ...
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1 vote
1 answer
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Switching regulator vs converter

Is there any difference between switching regulators and converters? I have read about step-down voltage regulator and buck converters and they seem to be the same. So, can I use the term converter ...
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1 vote
3 answers
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How to add 12V cooling fans to existing 48V circuit?

I have a 48V stepper running off a 240W supply, max current of the drive is ~4A. I am looking to add an 80mm cooling fan to this circuit. I know 48V fans exist, but 12V are more widely available and ...
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1 vote
1 answer
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What is the difference between buck and step-down converter

I always thought "buck" and "step-down" are synonyms. But now I'm looking at two datasheets: CAT4201 CAV4201 They seem very similar, but the first is described as "350 mA ...
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2 answers
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Difference between VO+ and +5v Outputs On a Power Supply

I'm a filthy casual with electronics. I purchased a really simple step-down 5V DC power supply. It has 2 inputs (AC L/N) and 3 outputs (VO+, VO-, +5V). I assumed VO stood for Voltage Output but what ...
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1 vote
1 answer
46 views

Step-down Lipo voltage to 1.9v

I'm trying to power a MMA9995l, NRF24l01, HDC2080 and ATMEGA328P from a Lipo battery. The perfect voltage for this is 1.9V. Since I'm quite new to component sourcing and step-down converters in ...
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0 votes
0 answers
108 views

MOSFET failure in DC-DC switching converter

I am using the following circuit to drive a 220 W heating load. The Vin is 24 V. The MOSFETs Q1 and Q2 are CSD18503Q5AT. The LM27222 is driven by an ATMEGA328P at 5 V with a PWM at 62 kHz. We noticed ...
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Help with DC - step down- power supply

I've got 2 of these DC power supply units https://www.ebay.de/itm/401176345822?hash=item5d67f93cde:g:EuQAAOSwYOxeA0mx I work them with a 2 x 40V DC rectified transformer. They served me well till ...
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0 votes
0 answers
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Choosing an Inductor for MAX8792

I want to make sure I chose the right inductor value for MAX8792. My step down converter should convert 12V to 1.8V while delivering maximum 3A at the output. this is a schematic that was used to ...
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2 answers
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Setting the output voltage of MAX8792

I'm interested in using MAX8792 in order to create 1.8V primary voltage for Tiger Lake UP3 intel CPU. I didn't find any formula that relates to the output resistor divider in order to set the output ...
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1 vote
0 answers
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How to select external components for a buck converter?

I design a simple circuit activates fan when processor heats up and then control rotation speed. The fan has a brushless motor with an internal motor controller. So I got the idea to create a buck-...
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1 vote
0 answers
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Buck converter (TPS54331) oscillating

I have designed and built a buck converter based on the TPS54331 which oscillates at 5.4kHz with an amplitude of 700mV peak-to-peak under a 1A load. I want to remove these oscillations. Here is a ...
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0 votes
1 answer
135 views

Understanding Power Good Signal in TPS54719

I'm using TI TPS54719 DC-DC and I'm trying to understand the PWRGD signal functionality. Definition of PWRGD pin in datasheet: An open drain output, asserts low if output voltage is low due to thermal ...
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1 answer
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Which voltage converter will work for my amplifier? [closed]

I recently moved to France from the United States. I am in the market for a voltage converter for my markbass amplifier: From the little research I have done, there seems to be a general consensus ...
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0 votes
0 answers
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Replacing mic22705 buck converter with cheaper one

Since Microchip decided to increase their mic22705 price, my company decided to replace it with another synchronous buck converter. the current price we get for 20K units of mic22705 is 1.459$. The ...
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2 answers
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How do I calculate the discharge time of a battery with a step-down converter?

I'm building a battery to drive a small 12V motor which is rated to draw max 7A. The battery has the following stats: Nominal voltage: 14.4V Capacity: 20.4Ah So I calculated that the energy should ...
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1 vote
1 answer
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How do you regulate a car battery down to exactly / not more than 12V?

My problem: I want to light up the inside of transporters with a 12V LED strip. But I don't think powering it with the 12V car battery directly is a good idea. Although the name implies 12V, a car ...
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Dc to DC converter: "split" one power supply (24V, 5A) into four power sources 5V, max 3A

I have one DC input 24V, 5A. I have designed a 4 channel led driver using the PAM2804 for Cree RGBW leds. I am using 3 of them. So, 3 Rgbw leds, and 3 led drivers. I need to be able to control ...
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2 votes
2 answers
96 views

Step down variable high voltage DC input to low voltage DC output

I'm looking to find a system that will help me step down a high voltage DC input to a low voltage output. The problem is that the DC input in question is not very stable in terms of voltage and varies ...
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1 vote
1 answer
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5V source directly or 12V stepped down to 5V

I'm setting up a circuit to handle a 5V LED strip, which consumes between 500mA and 1A in bursts. The power source is a serial ATA cable which has 5V and 12V lines from the PSU. Without a capacitor ...
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0 votes
1 answer
219 views

5V to 3.3V what is wrong on my schematic?

I made a schematic based on the SY8089A1AAC(Datasheet) My schematic(I tried with and without C8): I soldered everything but the output is 0V(0.04V to be precise) What is so wrong ? It is part of a ...
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Input Current for Basic Chopper DC

I have a very basic question about the input current in a basic DC chopper. Following is a picture taken from the book "Power Electronics for Technology", by Ashfaq Ahmed. Considering that ...
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1 answer
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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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1 vote
2 answers
101 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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0 votes
2 answers
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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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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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