Questions tagged [buck]

A non-isolated DC-DC converter topology which outputs voltage less than or equal to the input voltage

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74 views

Buck converter design review - updated

Last week I asked this question attempting to find a solution to efficiently converting higher voltage to lower voltage. From the answers, I arrived at TI Power Designer and I ended up with this ...
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50 views

MIC28515 overheating with high input voltage

I've designed this MIC28515 buck regulator based on the manufacturer schematic reference. I'm planning to run it at 70VIn I'm doing the tests with @ 5V 2A load Temp(Amb) = 20C. When I set a VIn of ...
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754 views

Buck converter input current

How to calculate the input current consumption of the buck converter. It's seem that the output current only depends on the output voltage, duty cycles, input voltage, and coil inductance. Does the ...
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563 views

LM2596s-Adj dc to dc buck converter

Does the schottky diode current rating affect the performance of a dc to dc buck converter when loaded? Im using a 1N5822 shottky type instead of a 1N5825 on a National Semiconductor LM2596s-Adj based ...
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46 views

Buck Converter Bad Regulation

I'm working on a 5V buck converter circuit. Below is the schematics: The circuit is designed using the LM43603-Q1. I put in an input voltage of 8.4V into the PCM_IN pin. I used a variable load to ...
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49 views

Can a fixed output buck have too much output capacitance?

I'm working on a design with this buck regulator: tps62130 I'm using the 5V fixed output voltage version. I'd like to have significant capacitance on the 5V output because the device can be powered ...
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47 views

Error in resonant converter simulation

I designed a closed loop resonant buck converter using voltage mode control and simulated on PSIM. Here is my circuit:- This gave correct results. Now I want to design an input filter so I simulated ...
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77 views

How to create a high power buck converter power supply? [closed]

I am building a device that requires a lot of energy at its peak, about 30W. The kind of supply I want to build looks like this: I understand that this is made of a controller which switches a ...
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42 views

Buck boost converter inductor rating

I am designing a buck boost converter with a 12v output, and 50A current output. The input range is 8v-14v from a supercapacitor. However based on the Texas Instrument buck boost design sheet Basic ...
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46 views

on/off pin problems with the LM2678 5.0

PCB: My name is Ertuğrul. I made a regulation board with an LM2678 but I have a problem: I provide 12V input but I can not get 5V output. I only get 5V with the on/off pin enabled, but the datasheet ...
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60 views

Buck converter placement on PCB

I want to place this XL4015 buck converter board on my PCB. Is it reliable to mount this module directly above digital logic IC components using spacers? I am not sure if the module has a good ground ...
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35 views

Multiple buck converters and their draw

This is another LED pixel project that I'm looking to power in a slighty different way. It's 110no. 5050 SMD pixels on a 300mm x 300mm board. The long and short of it is that I'll use USB-C Power ...
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114 views

Buck converter problem

I have this buck converter - BD9G201EFJ-M Buck converter specifications: Input voltage - 18V to 32V Switching frequency - 300kHz Output voltage 9V Load current - 0mA to 200mA maximum. I am ...
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74 views

How does increasing the capacitance affect the output voltage for a buck converter and boost converter?

From the formula of charge relating capacitance and voltage, $$ Q = CV $$ Capacitance is inversely proportional to voltage. This is how I got the idea that possibly when increasing the capacitance, ...
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1answer
54 views

Is there a mathematical representation that represents the output voltage of a buck or boost converter in discontinuous mode?

Recently I have learned that in buck or boost converters, the output voltage depends only on the duty cycle and input voltage in continuous conduction mode or when current is continuous. However, in ...
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55 views

Buck converter current

I have this synchronous buck converter. Input voltage - 8.7V Output voltage - 5V Switching frequency - 350kHz to 450kHz Output load current is 2A Schematic: I have an input capacitor of 68uF and an ...
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62 views

How does a boost converter allow for a gain in output voltage by just switching the positions of the inductor and switch?

I get that in a buck converter, a low pass LC circuit was attached and this effectively filters out high frequencies. If the bandwidth is configured so that it is lower than the switching frequency, a ...
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574 views

Practical buck converter output voltage too high for given duty cycle

I'm attempting to implement a buck converter as shown in the schematic using a p-channel mosfet as a switch. I'm having difficulties implementing this circuit practically. The simulation produces a ...
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3k views

Do 100% duty cycle buck converters have no voltage drop?

I am currently designing a circuit which should be able to take 12-28V DC power in and output 12V DC @ 1.5A. The question is: is this possible with a 100% duty cycle buck converter (like TPS54302)? ...
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1answer
200 views

State Space Average Model of Non-Ideal Buck Converter

I've been learning power electronics and am trying to design a dual-switch forward converter. One of the things I've been trying to do is derive the small-signal equivalent circuit of the non-ideal ...
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82 views

Components for adjusting the current and voltage of a very high energy power supply

I have two microwave transformers in series connected to a Cockroft Walton voltage multiplier. This allows me to generate well over 1 million volts (measured by spark gap) at high current (it looks ...
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34 views

Why is my buck converter getting hot when voltage is supplied to the output?

I have a buck converter (LM2596) converting 12V to 3.3V to power an ESP32 off of a 12V battery. When I power my ESP32 via USB and it is connected to the output of the buck converter but the buck ...
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1answer
27 views

Buck converter AP65111A gives no power when bootstrap capacitor is connected

I'm using AP65111A buck converter and it works fine. It has typical beginner-level ripples, somehow manages to keep the voltage under moderate load and so on. However, following the schematic 1:1 for ...
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73 views

Best way to Step down 6V DC or 9V DC for 3.3V DC operation

I am basing on TIs TPS62745DSSR. I have the circuit above and I want to use two CR2032 coin cell batteries to power VCC_IN. I have made this circuit based on info collected from the internet. My load ...
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1answer
102 views

Buck Converter EMI simulation output LTSpice

I am trying to do an elementary EMI analysis on my Buck converter circuit by modelling the LISN circuit. I am using LTSpice for this. The buck converter works when I simply simulate this circuit alone:...
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159 views

Setting current on Diodes Inc PAM2863 LED driver IC, with external resistor AND driving different voltage to VSET

I'm looking to use the Diodes Inc PAM2863 DC-DC LED driver in a project. The datasheet gives a V=IR method for setting the average output current with an external resistor, where Iout = 0.1 / Rs. ...
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Android Device Using Buck Converter (Voltage Regulator) instead of Li-Ion Battery

I have a project that is basically replacing my car's instrument panel with an Android device (a tablet). I managed to make everything work except for one thing: the Li-Ion battery of the tablet was ...
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62 views

LDO and buck converter

I heard someone said, using LDO is better than buck converter, but I don't know why. Why is an LDO better to be used with op-amps than a buck converter?
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175 views

36x LED 5730 in series: diodes burnt when LED driver (based on BP9833A or MT7854BD) powered up

Background: I have 18W, 36 LED lamp fixture which I cannot change. Originally it has 2x parallel 18off 5730 LEDs and 300mA driver. It works for some time, but diodes starts burning. I thought that ...
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Absurd screeching from a buck convertor

I got a buck converter from Amazon. This- https://www.amazon.com/MCIGICM-step-down-Converter-3-0-40V-1-5-35V/dp/B06XZ1DKF2 Now it's soldered onto a custom PCB I designed. I'm supplying it with 12V and ...
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29 views

What is the relation between the control voltage and resulting pwm in a voltage-mode control system for DC-DC converters?

I'm currently learning about negative feedback and voltage mode control for various DC-DC converters. I'm very confused about how the control voltage changes the pwm signal, along with how the ...
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111 views

How to step down the voltage efficiently

I need to power three devices/loads from a single DC source (a 48V at 200A battery). The buck converter used is this. The three loads are: RFID reader (24V DC @ 2.1A) Rasberry Pi 4 (5V DC @ 3A) DC ...
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213 views

Buck converters

I have seen many high watt like 1200 or 1500 watt boost converters and not a buck converter with that high wattage or power rating . I'm planning to make one buck converter (input- 35 volts output-3 ...
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70 views

Can a Buck converter operated at 200kHz be used to step down 230V DC input to 5V DC output?

I was wondering whether this type of converter is possible. Any clarification on it will be appreciated. Thanks.
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177 views

how to calculate rms value for current square wave

How do I calculate the RMS value for the current waveform during a transient event like the picture below? Assuming: Ix=6A Iy=38A duty cycle= 38% frequency= unknown My goal is to know what is ...
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1answer
103 views

Why LM2596 buck converter output current is low when used as a mobile charger? [closed]

I am having LM2596 buck converter which is capable of providing 3A current and my input source is capable of providing 5A which is a transformer. but when i used the buck converter to charge my ...
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1answer
38 views

Current and power analysis for DC Buck Converter simulation using PSpice

I have a simulation circuit in PSpice that I got from digikey for my part I ordered. I simulated and found my configuration outputs the correct voltage but I need to do further analysis on the current ...
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104 views

WARNING: Can't resolve .param in LTspice

I am going to simulate buck converter using current mode control. I followed the circuit 2-80 from book Switch-Mode Power Supplies: SPICE Simulations and Practical Designs, second edition written by ...
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38 views

synchronous buck - nmos current flow direction

As far as I know in nmos the current flow from the drain to the source, and the drain and source are determined by the pin with the higher voltage on it (such that the source is the pin with the lower ...
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184 views

Simpler ways to develop a buck regulator

I am designing a low profile space grade buck regulator. I have the following constraints ICs must be space grade Low component count Small size The converter specifications are as follows. Input ...
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1answer
146 views

State-Space Model of a Buck-Converter in DCM

I have a problem getting the State-Space Representation of an Buck-Converter in DCM. There are 2-Switch Cycles between one Period. If the Switch is closed the Circuit looks like: after applying ...
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1answer
311 views

Using LM2596 step down with LiPo

i'm doing a project with esp32 (3.3v), dht11(3v-5v), soil sensor (3.3v-5v the cheapest Chinese), nrf24l01 (2.6 - 3.6v). I'm using lifepo4 right now (3.32v) but when the battery drop about 3v, soil ...
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658 views

Is it better to have a higher Vgs than Vds on a MOSFET (n-channel)?

I've been studying MOSFET switching applications recently, and have been playing with the Circuit Simulator Applet here. In my diagram below, I have Vds usually set to either 12 or 14, as I am trying ...
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81 views

Best option from 30–60V to 3V3

I need to take power from ebike's battery (30–60VDC) for a datalogger (3V3) based on STM32 with almost no consumption. My question is what is the most efective conversion from 60V to 3v3? Is it good ...
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58 views

What is this fluctuation I get when I use the DC electronic load?

I have a buck converter. I am loading the buck converter using an electronic load - EA-EL 9200-18T When I load 100mA at the output of the buck converter, I get this waveform: To try to find out what ...
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84 views

Why overshoot happens in Inductor voltage in an open loop DC-DC buck converter?

I am extremely confused about why this overshoot occurs in the Inductor voltage waveform in buck converter and also why the time to achieve steady state reduces on increasing the load resistance. ...
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53 views

Capacitor currents equations for Buck Converter with Input Filter

I am trying to analyze the capacitor currents for the below buck converter with an extra L-C input filter: Switch in Position 1 \$ i_1(t) = i_{c1}(t) + i_{τ}(t) \$ \$ i_2(t) = i_{c2}(t) + i_R(t) \$ \...
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69 views

Rectifier ripple on DC-DC buck converters

I'm using the LMZ36002 buck converter module, which is a 1 MHz 4.5-60 V 2 A buck module. This means there is already an integrated inductor in the chip package. This device will accept any voltage ...
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67 views

Glitches in inductor current waveform

I am using this DC-DC buck converter. Schematics : Buck converter specifications : Input voltage - 18V to 32V Switching frequency - 300kHz Output voltage 9V Load current - 0mA to 200mA maximum. ...
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1answer
47 views

How to Increase Solar Charge Controller Output Amps

I am new to solar panel system set ups, and I'm trying to make an off-grid DC-DC solar panel system where in I will be running a bunch of 12v loads which are mainly DC Pumps cause its gonna be ...

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