All Questions
Tagged with buck power-supply
223
questions
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Buck Average Modelling
I completed average modelling with Voreperian PWM switch model as described in Christophe Basso's book "Transfer Function of Switching Converters" and I compared the average model with ...
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1
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101
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Buck Converter Peak Current Mode Control Average Model
I am trying to understand average model of Buck Converter for Peak Current Mode Control Topology.
Below snapshot taken from Christophe Basso Webpage(https://powersimtof.com/Spice.htm) from file "...
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0
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23
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Does a buck-boost converter serve as enough circuit protection for an automotive application? [duplicate]
I am designing a circuit for a automotive application which is meant to map voltage ranges between two airflow sensors (i.e. 1 sensor has an output range of 1.75-7.0V and I want to replace it with a ...
2
votes
1
answer
81
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Peak current mode control loop compensation calculations
I recently came across a rather nice straight-to-the-point application note by RickTek (AN028) on how to calculate approximately the compensation network of a PCM buck regulator.
Link : https://www....
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4
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4
answers
570
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Inductor energy storing in buck converter
I am trying to understand inductor energy storing during ON time in buck converter.
Energy stored in inductor of buck converter is (Input Power -Output Power)*Ton
Lets say output power is 5 W and ...
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1
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172
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Audible Noise in MC34063-Based Buck/Boost Converter Circuit
I am trying to make a hotplate with an ESP32 and I use MC34063 for buck/boost converters. The hotplate itself require 12-30V to operate and the ESP32 and LEDs need 3.3V.
Here is the circuit:
When the ...
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0
answers
35
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Debugging buck converter IC having trouble reaching stable power good after short
I have a 5V power supply circuit from coming from a 12V in to 5V out of a TPS54620 on an FPGA development board I purchased. There was an incident with a bad header connection that caused a GPIO pin ...
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114
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Should I put my buck-converters in parallel or series?
I'm supposed to have two voltages coming out of two buck converters. My starting voltage is 12 V while the buck converters are supposed to output 5 V and 3.3 V respectfully.
Should I make the output ...
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1
answer
69
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Schematic review MAX20029ATIAV
I am using a MAX20029ATIAV in my design for powering a Quad Tunneling GMSL2/1 to CSI-2 Deserializer.
MAX20029ATIAV is Quad Low-Voltage Step-Down DC-DC Converters.
My schematic is given below. May I ...
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60
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Best power supply configuration
I'm making a power supply board with a buck converter for a 2A maximum and I would to know which is the best configuration between these two:
Is it best to put the input filter, a parallel damped LC ...
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1
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1
answer
92
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Custom buck converter putting out 1V instead of 5V
I "designed" a simple buck converter, which is basically a clone of the 5V reference design in the TPS6293x datasheet. Unfortunately, my converter is only putting about 1V (closer to 0.95V). ...
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Circuit to convert 14.8v battery with max 4a discharge current into 12v, 9v and 5v output?
I am making a robot with multiple devices mounted on top. I am planning to buy either a 14.8v or 11.1v Li-ion battery which has internal BMS limiting maximum discharge current to 4A. Now I need 9v for ...
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Deriving Power Budget for SAMA5D27C from Datasheet
I am spec'ing out my power distribution network and trying to figure out what Buck converters I am going to need for a Microchip MPU design using SAMA5D27C. I am looking through the data sheet below ...
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1
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1
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125
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Burning sound from the PSU
I am trying to make a bench power supply from an old 350W PC PSU
that provides 4 lines
3.3V 8A
5V 9A
12V 11A
-12V 1.5A
Here is the connections diagram:
I used this step down module to be able the ...
0
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1
answer
130
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Buck converter not behaving as anticipated with new trim pot resistors
I recently purchased a 300W buck converter from amazon 1 which has two 3296W 100K trim pots to control the constant current and constant voltage output. My plan was to use them as bench power supply ...
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1
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114
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Non-synchronous buck ASIC's diode selection makes sense?
While selecting buck converter ASIC for a design I came across various synchronous and non-synchronous buck converter from different manufacturers. Synchronous buck are OK - no problem with SW node ...
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1
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147
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Buck converter inductor ripple current percentage
I am designing a buck converter using LMR36015 (Texas Instrument). The specifications are:
Input voltage: 24V (+/-10%) = 21.6-26.4V
Output voltage: 3.3V
Output current: 0.4A
Fsw = 1MHz
This leads to ...
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0
answers
105
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The best way to step down 12V to 5V with at least 10A current from a PS3 power supply for a WS2812B LED strip
I am new to electronics. I had a PS3 Super Slim power supply lying around, which outputs 12V up to 13 amps. Recently, I bought a 5-meter strip of WS2812B LED strip, which needs 5V, and the recommended ...
1
vote
1
answer
106
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High Current Step-Down Conversion 12V-5V/100A
I inherited two 12 V, 1200 W server power supplies a while back and I'd like to press them into service as electrolysis cell power supplies for making (per)chlorates. I need to drop the output to ~5 ...
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1
answer
86
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How to convert a {200 VDC, 3A} power supply into a {12 VDC, 50A} source?
As title states, want to convert a high-voltage, low-current DC bus to a low-voltage, high-current DC bus that's more compatible with electronics circuits. This seems to be a pretty large input for a ...
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1
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1
answer
149
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LTC7803 Buck Converter Current Mode Compensation
I wanted to design a step-down converter using the LTC7803. Goal is to have a 5V, 0-2A output with an input voltage range of 10-30V. Switching frequency is set at 1MHz. As shown in the LTSpice picture ...
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2
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252
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DC to DC voltage step down converter on PCB
I'm a beginner and I'm designing a PCB where I want to power my PCB from a 12-24 V DC car charger.
On PCB itself, I want to use 5 V and 3.3 V for different components, so for this purpose I'm trying ...
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1
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1
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35
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Why does this multi-phase buck controller have one phase to be driven by external driver?
https://www.renesas.com/in/en/document/dst/isl62883-isl62883b-datasheet
"The ISL62883 uses two integrated gate drivers and an external gate driver to provide a complete solution"
Why would ...
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59
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Reduce voltage ripple in wall power supply and buck converters
For my project I choose a wall AC/DC power supply (AEJ160PS12) with output voltage at 12V and intend to use some buck converters to step down from 12V to 6V and 3.3V. The chosed buck converters is ...
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31
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PMIC MIC23451 operating voltage range
I am using Microchip SOM module in my project. Not using all the things in the SOM.
So we are redesigning the board with necessary components for my application.
Below is block diagram shows the main ...
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1
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167
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What extra components are necessary to bypass a boost converter when the input voltage exceeds its regulated output voltage?
I've made a USB-C power supply that's powered by a wind turbine. It contains a boost converter and a separate buck converter.
I'm aware that there are several buck/boost USB-C power supplies out there,...
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1
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446
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Buck Converter Gain Margin and Phase Margin Review
I am using this IC (MPQ4470) for designing a buck converter (12 to 5 V - 3 A). Below is my circuit.
I am checking the stability of this circuit. My phase gain plot is given below.
My PM is 92 degree ...
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85
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Buck Converter Output Is Coming To More Than The Designed Value After 3 Or 4 Months In Some Boards
I have a buck converter which converters 12V to 5V,3A. The output of this buck converter is going to a load switch and from the load switch it is going to a connector.
What we observed is that after 3 ...
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58
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Using 2 LiPo Batteries via 2 Buck Converters for External Notebook Power Supply - will it work?
I have an old ThinkPad X220T notebook of which the internal battery is broken (and removed).
To get my notebook working on the go again I want to build an external portable power supply with 2 LiPo ...
4
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2
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3k
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LTspice Frequency Response Analyzer (FRA)
This post is a continuation of this question.
LTspice recently introduced a new feature called frequency response analyzer, see the image below.
The green box shows the symbol for FRA. If you click ...
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114
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Buck converter inductor selection: maximum switch current limit vs output current
I need to select an inductor for this buck converter. Its output current is 3 A and maximum switch current limit is 6 A. As far as I know, I need to select an inductor whose current ratings (both DC ...
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2
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968
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How to measure the stability of a buck converter using LTspice
Below is my buck converter circuit. How can I check its stability using LTspice?
I need to measure GM and PM.
Is this true that a 30–60 degrees phase margin and a gain margin of 2–10 dB are desirable ...
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3
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3
answers
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What do the waveforms in a buck converter look like just after turn on?
Below is the circuit diagram of buck converter.
I am studying about the buck converter. What I observed is everywhere it is explained with the help of waveform in steady state.
I have a couple of ...
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130
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Buck converter inductance vs Line and load regulation
I know how to design the inductor and capacitor for a buck converter.
My question is let the calculated value of the inductance be some "X".
May I know what will happen to line and load ...
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1
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89
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STCS05DR LED driver
I am trying to use the STCS05DR constant current LED driver IC by STMicro in my buck converter design to indicate input power with a 1206 red LED.
The input power is a variable DC battery source (...
6
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2
answers
1k
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How does a buck converter's output ripple waveform become sinusoidal?
Below image is from Fundamentals of Power Electronics.
The ripple component of the inductor current will be flowing through the capacitor as shown in the ic(t) graph. This one I understood.
May I ...
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2
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680
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How can I power an ESP32 with a 54V battery using a buck converter?
I need to power an ESP32 board from a 54 V battery. For that purpose, I understand that I need to step it down to 5 V so I need to design a step-down buck converter.
I tried the following circuit ...
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3
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1
answer
400
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Simple SMPS power supply using buck converter
I'm a pretty new hobbist in this field. I wanted to try to create a simple and cheap power supply that transforms 220 V, 50 Hz AC into 15 V, 8 A DC, but I really can't understand how.
I've tried the ...
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1
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1
answer
168
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How to minimize the ripple on a buck regulator powering a CM4?
While designing a Raspberry Pi CM4 application board, I found an issue with the power supply.
I selected the same IC as the official CM4 I/O board: the AP64501SP-13. I used even the same values for a ...
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1
answer
581
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Buck-Boost Converter Inductor Value
I am designing a typical buck-boost converter using the LTC3530EMS#PBF IC from Analog Devices.
My design specs are as follows:
Vin: 3.0V - 4.2V
Vout: 3.3V
Iout(max): 300mA
Fsw: 1MHz
In the datasheet, ...
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1
answer
57
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Power supply connected to multiple buck converters, input current requirements
I have a 24V/40A power supply with a foldback current limiter. And I need to connect 76 buck converters of 5V and 2A each to it. Since the current of the power supply is limited and considering that ...
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1
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1
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194
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4-20mA loop energy harvester
I'm designing a board which is powered from 4-20 mA Hart loop. Only two wire.
Actually I had 19~20V due to the 250ohm resistor of the master side.
I would like to power two electronic stages 12V@4mA ...
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2
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513
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Is a buck converter less efficient than 2 seperate PSUs?
I've built a CNC machine that runs from a 24V 400W PSU (Spindle & Electronics)
I just bought a laser to attach to it that requires 12V.
As I'd never run the spindle and laser at the same time, ...
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3
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58
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Do computer/datacenter power supplies utilize regeneration (like in motor control)?
In a PC power supply I have, it implements a synchronous buck converter that uses two active switches without a diode. I found a picture of the schematic online, whose link is below:
https://e2e.ti....
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2
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664
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Why is my DC-DC buck converter consuming 8mA of current with no load connected?
I am using a TPS5430 buck converter on my PCB which is converting 12V to 8V. If I shutdown the buck converter using the enable pin it consumes only a few micro amps but if I leave it enabled with no ...
0
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92
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Series capacitor buck converter small signal model
Does anyone know how to do the small signal model of the series capacitor buck converter?
I can't find a related paper talking about this one.
I think the small signal model is not the same as the ...
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1
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192
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Questions regarding this power module
I'm looking at this power IC module.
I assume it's a buck converter. In that case, on page 16 of the datasheet, Equation 4.1, there's this formula: Rvout = 8.2 kΩ * TRIM. If TRIM is 5, then what would ...
user220456
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879
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Powering ESP32S Node MCU through Vin vs USB
I am having a situation with my ESP32S Node MCU that I can't figure out.
I uploaded a sketch to my MCU that will blink the blue LED connected to GPIO 2 every x number of seconds.
Here is the sketch
<...
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2
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897
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What is this ringing in the inductor current?
I am working on a buck-boost converter and I see this ringing in the inductor current. It happens on turn on of the high side FET (See attached Image). First of all is this ringing normal?
Is there ...
-1
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1
answer
143
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Buck converter load voltage drop
I'm creating a buck converter from a NE555 and LM358 (feedback loop) for powering a tablet motherboard. (This is a learning experience for me, don't want to use an off-the-shelf board.)
Here is the ...
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