Questions tagged [buck-converter]
A switching converter that steps down an input voltage with the usage of internal or external switching circuitry. Has high efficiency when compared to linear regulators.
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MP2315s buck converter not working
I made a buck converter using MP2315s, and when I tested the final product it didn't work like it should be dropping 12v to 5v. Tested and no output
I input a 12v to the input of the PCB, and the ...
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Having problems with Gate Driver outputs
I am currently using the ADUM4221 gate driver to drive a half-bridge. It receives a pair of inverted and non-inverted signals , to drive the High side and Low side MOSFETS, from a dSpace RTI1104 ...
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Why is LM2852YMXAX-3.3 not working?
This is my schematic, I want 5V as input and 3.3V as output, am I giving the wrong Enable pin?
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When cascading a ferrite bead and inductor in the form C-L-C-L-C, which is best to put first, particularly for a buck converter?
I am asking this question specifically for buck converter inputs, but am happy to consider answers that are more general -- not specific to buck converter ICs, or focused on the output filter.
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Designing DC-DC buck converter based on the L6981 (L6981C50DR)
I will start by a small description of my system (I will omit any irrelevant information).
The DC DC buck converter that I am designing based on the L6981C50DR serves as the bridge between a smart ...
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Circuit sanity check: adding 3V LED to 18V Drill Battery
I want to add a 3V LED to my Makita DF457D cordless drill because it lacks illumination for the work area, unlike the newer, more expensive models. The drill uses an 18V battery, so I've chosen an MH-...
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Inductor Current Going Below Zero in DCM
I'm currently studying the Continuous Conduction Mode (CCM) and Discontinuous Conduction Mode (DCM) behaviors in buck converters and running simulations to visualize the differences. As I understand ...
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Forced CCM Buck Operation
I bit confused regarding ripple voltage comparison for forced CCM mode buck converter and asynchronous buck converter in DCM. Which case we will have higher ripple voltage?
Next question, when should ...
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Trying to build a buck converter with LM2576 Adjustable
I'm trying to build 12V buck converter based on this schematic
this is what I did
Is this already good enough, or does it need some more change?
this is my first trying to build something like this ...
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Help calculating and simulating buck converter
I want to simulate a DCDC buck converter to go from 6V to 3.3V, with a max. output current of 100mA.
I'm using this buck converter online calculator to find out the values I need. This is the results ...
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Voltage regulator stepping down voltage but not increasing current output?
I have these generic LM2596S buck converter modules.
I'm trying to buck the voltage from a 20V, 400mA solar panel to ~5V, 1A. From what I understand, after efficiency loss, I should be able to get ...
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Buck Converter IC with 3.5V Minimum Input: Will It Work Reliably with a LiPo Battery for an ESP32-S3? [closed]
I need a buck converter for an ESP32-S3 with a wide input voltage range that can support USB power (5V), LiPo battery (3.5V), or solar panel power (up to 24V) and provide a 2.5A output to power Wi-Fi ...
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Bidirectional Solar inverter circuit confusion
I has seen a solar inverter design and have some confusion regarding the inverter circuit I have drawn myself from an inverter. The circuit is shown below. As far as I understood going from left to ...
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Type 3 compensator for forward/buck converter
I am trying to build a isolated forward converter with voltage mode feedback. For some reason, I am unable to achieve required crossover frequency. To simplify everything, I have change the circuit to ...
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Is this flyback topology?
In below circuit transformer output is rectified and going to load.
Many smps circuits doesn't even have that L1 inductor. Where can I get more material to read on this?
source:
https://electrobuff....
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How to control a DC supply current using a micro controller
I am aware this question was asked before (How can I control DC current into a battery charger using a microcontroller?), but it was never answered, so I've added more information into this question ...
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Buck converter voltage inverter power glitch
I'm using a standard buck converter based on lm2596 to convert 15V to -12V (this is done by connecting 15V to IN+, GND to OUT+ and the -12V should now be OUT-).
When doing this if the input voltage ...
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Buck converter capacitor ripple rating
I'm working on a buck converter that discharges a 48 V battery into a 12 V one, 20 A, 20-200 kHz and 11 μH inductor.
My first assumption (wrong?) was that the batteries at input and output would act ...
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DC-DC Inverter Battery Charger using a buck Converter
I'm in quite a situation
I have a 220Ah inverter battery.
I was hoping to charge it with 14v 15A approximately 210W which I would get from a buck converter.
I bought the converter from AliExpress here ...
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BD9D320EFJ buck converter output overdrive causes excessive input voltage
Ref:
The following schematic:
Background:
This circuit is part of a controller board for a Raspberry Pi controlled robot and this circuit supplies the +5v to the Raspberry Pi through its GPIO pins.
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Question about Ridley's peak current mode control model, why the L in small signal model can be seen short-circuit when driving Kf'
I have a question about Ridley's way of deriving Kf' in his PHD paper: Why can the L in the small signal model be seen as a short-circuit? L can only be seen as short-circuit when calculating DC gain, ...
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Differential signs in schematic in a DC_DC convertor on FB and VSNS- pin
I'm working on a DC-DC convertor Buck architecture as follows (PTPS548A28RWWR):
I noticed something interesting: there are differential symbols on the FB and VSNS- pins as follows and they have also ...
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Is this buck/boost layout good?
I have this PCB layout with two TPS631011 buck/boost converters. I just wanted to know, whather thelLayout is good or if there is anything I should change before manufacturing this board.
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Switching regulator issues?
I'm trying to use a switching regulator (ptr08060w) to step 12V DC down to 2V DC, however it is not achieving this at all (even with no load connected), and is outputting a voltage that varies ...
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Buck Converters? [closed]
All I need to do is step-down my 12V power supply to 8V to power an Arduino, and I've been told a buck converter is the easiest way to do this; I see some buck converters online that look like this:
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PWM buck converter using IRFZ44N and BD139 [closed]
Please help me with this circuit diagram
I need to design a adjustable voltage supply 0-20V.
For that I want to use this circuit but somehow it's not working in my case. the PWM signal was generated ...
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Derivation of the AC small-signal circuit and the canonical form of a DC-DC buck converter
I'm new to this forum and hope you can help me. I am in the process of designing an input filter for a DC-DC step-down converter 12V-5V/1A (Pic.1).
I am trying to determine the transfer function and ...
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Inductor selection for a buck converter with uncertain output current [closed]
I'm struggling to choose the correct value inductor for my design with a TPS54331. Based on my estimations, I calculated a DC current consumption of 1.3 A for my circuit, but sometimes the circuit ...
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Why is the filter capacitor (used to filter pulsing DC) overheating MOSFETs in a buck converter?
I am trying to create a microcontroller (Arduino) based DC to DC buck converter with CC and CV features. For now, I am using a 20 V 5 A input source. Output voltage (target voltage) is settable by the ...
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Persistent ripple at the buck converter output
I developed a half-bridge buck converter, I did all the steps, from the converter calculations, such as accommodating the copper in the appropriate ferrite core, wire gauge diameter, etc., my project ...
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Buck Converter Coss Loss Equation [closed]
Why is the LS output cap not accounted for the loss due to output capacitance (Coss)?
In my mind, the LS cap is being charged by the pmoss, just as the HS cap is being discharge by the PMOS. For ...
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Can i connect two DC-DC buck converters 48V>24V in parallel to increase the current? [closed]
can i connect two DC-DC buck converters 48V>24V in parallel to increase the output current?
I have one 20A already but it shuts off by overload. The Load is sometimes 30A so im considering to ...
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Verification of Initial Conditions in an RLC Circuit (buck converter, output voltage)
I had drawn the following circuit (note that all components are ideal and european standard):
Suppose the following Situation:
\$t<0\$: The MOSFET was open for a very long time
\$t=0\$: The ...
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Average Model of Buck Converter
I am trying to understand average model of Buck Converter for Peak Current Mode Control Topology. Below is a snapshot taken from the Christophe Basso Webpage https://powersimtof.com/Spice.htm, from ...
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Verification of Initial Conditions in an RLC Circuit (buck converter, inductor current)
I had drawn the following circuit (note that all components are ideal and european standard):
Suppose the following Situation:
\$t<0\$: The MOSFET was open for a very long time
\$t=0\$: The ...
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answers
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Middlebrook Stability Criteria for Input Filter
I am trying to apply Middlebrook input filter stability criteria for Active clamp forward converter .So for finding Input filter output impedance over the frequency range is quite straight forward in ...
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Closed Loop Buck-Boost converter, no load condition
My question is how can I close the loop with no load condition of my buck-boost converter, by using peak limiting current mode control? Is the bleeder resistor needed or is it possible just to close ...
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Average Model of Peak Current Mode Buck Converter
I am trying to understand average model of Buck Converter for Peak Current Mode Control Topology. Below is a snapshot taken from the Christophe Basso Webpage, from file “PWM Switch LTspice: Mark ...
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Peak Current Mode Control Buck Converter Slope Compensation Info From datasheet
I am working on Buck Converter design based on LT8642S controller and trying to do average modelling ,so I contacted manufacturer regarding slope compensation info and they responded below.
"The ...
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Power Board Optimization
I've created a buck converter schematic that converts an input voltage of around 16.8V to 5V at 8A using the Sic477 buck converter. You can see my design below. While it produces the correct output ...
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Need for current protection on low current digipot
Context:
I am designing a power control system for a 24v 300w halogen lamp and to do this I am taking a stock buck converter Here with current and voltage control, removing two potentiometers and ...
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Replace battery by DC source (USB 5V)
I bought a Bluetooth audio receiver which is powered by 3.7V Li-ion battery. I tried to replace the battery source to a USB 5V with a buck converter and I managed to achieve it, here is my work around....
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Peak current-mode controller
I am studying a peak current-mode controller, and here is the schematic without slope compensation:
Before introducing RSENSE to the design, I understood that if feedback voltage increases, it is ...
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Designing a DIY low level light therapy device (LLLT)
I am designing a low level light therapy (LLLT) device similar to the one in this video.
Mine will be smaller using twenty each (for a total of 40) of two kinds of 3W LEDs:
2.4V 0.6A -- 660Nm red
1....
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LM2596 Not Outputting Voltage
I'm making a PCB that will use a Buck Converter (LM2596) to step down the voltage from 12V to 5V. When I supply 12V to the PCB it gets fed into the LM2596 but the output is coming out to be around ...
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Problem with circuit--ESP showing invalid packet header on powering the robot on by battery
I am trying to build a self-balancing robot, the circuit of which I have attached here. Now I am facing an issue, which is when I power the ESP via the 5V buck convertor output, the ESP gets corrupted ...
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Low Solar Panel Voltage Vmp Operation
so I'm currently working on an MPPT project using Asynchronous Buck Converter with the design :
Capacitor Input : 470uF/100V
Capacitor Output : 1000uF/100V
Inductor : 65uH
fsw : 39khz
current : 30A
...
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Why is this example of calculating the switching loss of a MOS transistor with an inductive load considered misleading?
I just saw an example of calculating the switching loss of a MOS transistor with an inductive load from this (page 20). Can anyone explain why they said this is ...
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Dirty VS clean ground: How to tie grounds?
I am trying to understand when grounds can be connected together and when they should not be. So far, I have learned the following:
Clean grounds should be connected together, as should dirty grounds....
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Voltage drop issues in LTspice simulation for buck converter using SW model
I have a LTspice design issue where I encounter the same problem, even when I use other available simulations.
Whenever I increase the load, there is a significant drop in voltage, despite having ...
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