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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1answer
26 views

Buck converter LC output filter contribution to phase margin

I'm trying to develop a better understanding of how my power distribution network can affect the stability and performance of buck converters, which has lead me to documents like this one. The main ...
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32 views

Multiple switching LED drivers on single PCB

I am working on a high power LED board project. It requires to have 100 LEDs, of different types and colors. There will need to be 17 individual strands (need to be able to dim them separate.) Max ...
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3answers
64 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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2answers
70 views

Interruptions in code or circuit due to 5v and gnd pin in arduino [on hold]

I am making an automatic temp controller using max6675 thermocouple sensor and a buck converter. They are connected to Arduino. For generation of 10Khz pwm signal for buck I am using Timerone.h ...
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3answers
55 views

Can I use a current control buck converter to charge a battery?

As shown below, could I use a microcontroller to charge the Li-ion battery? I'm unsure if I'll run into issues with the voltages on the ADC. I've done this exact setup before with a generic load, I'm ...
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1answer
16 views

Transient time in buck converter

To my understanding the reactive components in a converter should not store energy over a switching period, otherwise they will blow up. An in inductor for example abides by volt-second balance, which ...
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1answer
68 views

Why do I get this waveform at the output after power down of Buck Converter

I am having a buck converter which steps down 8-16V input to 5V output. Load current = 0.6A But upon removing the input power, I get the attached waveform. My schematic circuit is similar to the one ...
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1answer
51 views

My RT8272 buck dc converter fried in my test charging circuit for arduino

I'm building a circuit to power an arduino and later a stepper motor from a 3A 24V DC source. The DC power source is a switching power supply, much like those used in notebooks. I'll need after ...
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55 views

DC/DC Buck Converter PCB Layout Help

Most examples I find are for buck converters on a PCB of their own with massive traces. I want to make sure this layout is fine with the planes I'm using(both top and bottom copper pour layers are GND)...
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19 views

Classic motorcycle buck converter 12vdc to 6vdc [migrated]

I recently purchased a classic motorcycle, it's current factory electrics are designed to run at 6 volts. I do have plans to change it later to 12 volts but due to regulations in my country and to ...
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0answers
44 views

Output Current Derating for Buck converter for powering RF sampling data converters

I am new to the use of DC-DC converters. I am designing power supply for powering DAC from TI whose part number is DAC38RF80. DAC38RF80 is high speed RF sampling DAC with sampling rate as high as 9 ...
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3answers
224 views

Why aren't non-isolated DC-DC converters made for high wattage applications?

I am new to electronics. I am presently studying DC to DC converters. One thing I noticed is that most of the people are using isolated stepdown converters like half bridge, full bridge, or resonant ...
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1answer
62 views

DC-DC Converter - Why is the input voltage called Vg?

In the textbook I'm reading (Fundamentals of Power Electronics 2nd Ed, Erickson and Maksimovic), the input voltage for several different types of converter circuits is labeled Vg. The textbook gives ...
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2answers
67 views

How does buck converter increases current

I am confused regarding this, in buck converter Pin=Pout, so if I reduce voltage then current has to increase but my resister load is fixed at, say, 5 ohms - but resistors follows Ohm's law and ...
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23 views

Stability of Buck Converter when output capacitance is variable

I am designing a buck converter for an application that has several different loads. Depending on what devices are connected, the capacitance seen at the output of the buck converter can vary ...
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28 views

logic mosfets driving irfz44n

iam building a mppt solar charge controller.iam using parts from an electronics scrapyard.i have drawn a schematic with the available parts in easyeda site(attached).resistor and capacitor values are ...
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1answer
52 views

Common ground for different voltages

I see there are a number of questions regarding this but none made it clear to me, so I'll risk being virtually stoned and go ahead and ask it again. I have a 12V battery which powers some 12V ...
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0answers
52 views

12VDC Switching to 17VDC high amerage

It's been years since my undergrad work as an EE. I am a physicist and medical researcher now, but, as a startup, we all take on anything we can. Let's face it... 12VDC high current PSU's are cheap. ...
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2answers
82 views

Understanding the thermal images of planar pcb coils

Why is only the first turn in the coil hotter compared to other two turns? In this, only the turns of the top part seem to be hotter compared to the bottom. Current through the coils is 2 A. It is ...
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1answer
51 views

Buck converter internal structure

I want to understand how LM2574 step-down regulator works and I can not find the logic of the comparator in the following picture: Can anyone explain ?
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42 views

Current and voltage increasing with duty cycle from buck- converter

I am designing a 2s Li-ion battery charger using a buck converter from a 10W (18V, 0.55A) solar panel. So I understand that the duty cycle controls the ratio of the input power vs output power and ...
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3answers
153 views

How can I run a 6.5V-100V power meter on 5V?

I have an eBay power meter (V/A/W/Wh) that is specced between DC 6.5V and 100V. It's wired with a 75mV 100A shunt, like this: If I wanted to run the thing at 5 volts what would be the easiest way? ...
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1answer
55 views

MC34063 - Stucks with too much parallel devices [closed]

I've a circuit schematic: I power my circuit using only PWR+ and PWR- at 24V. When my power supply powers only one circuit or two, in parallel mode, I don't have any problem. When I attach more like ...
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1answer
58 views

(230v)AC-DC(12v) wall adapter flashes when connected to dc to dc buck converter [closed]

So I used a common 230vAC to 12vDc (1AMP) wall adapter with dc jack like this and converted to 5v using a dc to dc buck converter same as based on lm2596s But the adapter LED starts blinking (...
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1answer
42 views

Is it convenient to use a buck converter on a RS-422 communication board?

I am working on a PCB design with STM32 MCU. On the PCB there will be 2 MAX490 transceivers and one bluetooth module. Communication speed will be 921.6 Kbit/s for all communication elements. ...
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1answer
249 views

PWM FAN controller & Ideal 24V DC to DC 5V Converter just to feed 556 IC

I'm trying to find a best match for a regulator that can feed dual timer ic. The 5V circuit is dedicated to that IC which will generate a PWM pulse signal to PWM control the FAN speed. It's a 4 pin ...
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0answers
79 views

Inrush Current problem?

I have a 360W 36V Switch Mode PSU which I am using in a garden lighting system I have designed. I'm in the UK so it's running off 240V therefore can supply about 10A. Each section of the ...
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1answer
29 views

Pulse frequency modulation mode in buck converter MAX15062

I am modelling MAX15062 DC-DC buck converter using datasheet in PSpice, initially i worked on control loop. This buck converter has two modes PWM and PFM mode. With MODE pin unconnected works on PFM ...
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1answer
34 views

Buck converter simulation in orcad

I am trying to simulate a Buck-converter circuit in Orcad, but no matter what I change the input voltage to I still get the same output voltage result. I tried this in Multisim and got the same issue. ...
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92 views

Driving of a MOSFET using optocoupler in 180-to-24V buck converter

i have a problem with driving a MOSFET in a converter, let me explain. I need to build a Buck Converter with the following requirements: Input 180 V (From a 120 VRMS rectifier circuit) Output 24 V No ...
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50 views

Simulation issues in Buck converter design

I'm trying to understand Buck Converters by designing & simulating a circuit in www.Falstad.com circuit simulation tool. Here is the link to the circuit that I've Designed. link to circuit ...
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1answer
40 views

Buck Converter - Closed Loop - Effect of decreasing inductance and increasing capacitance

Output voltage as a function of output current is plotted from oscilloscope data for a closed loop buck converter. Switching frequency is kept the same in both the cases. CASE 1 : Inductance = 2....
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2answers
89 views

Buck converter for Li-Ion 2s battery charger

I'm currently doing a project that requires the charging of a 2s Li-Ion battery. I have an 18V 10W solar panel that I want to charge my battery using a buck converter. Im controlling the switch and ...
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0answers
41 views

Buck Converter MOSFET Output Voltage distorted (PWM)

The input to my buck converter MOSFET switch is a PWM signal with a certain duty cycle. However, upon observing the voltage waveform of the MOSFET, the voltage is a bit distorted. The input to ...
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4answers
349 views

Is DC-to-DC (24 V to 12 V) buck conversion typically more efficient than AC-to-DC (110 V to 12 V) conversion? [closed]

While building an online UPS system, I'm basing the choice to eliminate as many AC inverters from the system as possible because of the assumption that DC-to-DC conversion is more efficient than AC-to-...
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1answer
81 views

Buck step down convertor uses a lot of current? [closed]

I have a DC-DC buck step down converter module LM2596 voltage regulator set to supply 3.0 volts to an atomic clock using a 8 Ah 12 V battery. The clock normally uses 2 AA batteries. https://www.ebay....
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1answer
51 views

Step down converter design calculation

I am using a Step Down Converterto step down 3.3V to 1.8V with a Load current of 500mA. I have an output inductor of 10uH and 1.2A rated current. I have designed my converter with the help of this TI ...
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0answers
24 views

Constant current limit in the SIMPLIS

I wanted to convert this error amplifier form Pspice to SIMPLIS, for now i am using voltage controlled current source (VSCS) with the FB nod to the negative and Vref to the positive node of the device ...
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1answer
118 views

How to sketch the Bode diagram of the output filter of a Buck converter?

I'm trying to figure out the Bode diagram of the output filter of a Buck converter: simulate this circuit – Schematic created using CircuitLab Vout is ...
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0answers
23 views

Limiting current in a NCP3020A switched DC/DC buck converter

I want to design a 12VDC to 5VDC converter using a NCP3020A. As my application has nothing special, I should follow the topology of the Typical Application circuit, and reapply the formulas in the ...
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0answers
27 views

Buck converter design using MCP1630V

I have already designed a buck converter with the following specifications using an MCP19035: Vin=14V, Vout=1.8V, Fc=63kHz(Crossover frequency), Vref=0.6V, Iout=10A step load High IOH=7.5A step ...
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2answers
41 views

MCP19035 buck converter controller

I'd like to design a buck converter using MCP19035, I've gone through the datasheet of this component and and the design procedure using it. In the datasheet, it says that the component provides Two ...
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0answers
36 views

Voltage regulator feedback circuit and stability analysis?

I have been analyzing following buck-regulator circuit to calculate the phase-margin and gain-margin. Circuit Diagram: Buck regulator with input voltage = 12 V and output voltage = 3.3 V. Just as ...
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1answer
62 views

Bootstrap cap value and how it relates to fsw and duty cycle?

I am designing a synchronous buck converter with mppt. I have a question about the bootstrap capacitor value. Knowing that the duty cycle and fsw are dependent on this value. What is the best approach ...
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0answers
33 views

Solar panel voltage with buck converter and mosfets?

If the input voltage of the solar panel as Vin in the picture below. if Vin is in the range of 10 V to 37V.The average voltage value in the node in yellow during switch 1 is on and switch 2 is off is ...
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1answer
31 views

High side MOSFET Driver component selection

I'd like to drive high side and low side MOSFET for buck converter, so I have used IR2184s,(the image bellow) to do the job, The frequency of oscillation is 1Mhz, so DRVR is a square wave signal of ...
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1answer
46 views

Simulation of a chopper type E (four quadrants) in pspice

Im trying to make a chopper working in the four quadrants based on these idea translated to this circuit But it cant be simulated, psice gives the next log ...
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2answers
84 views

Buck Converter won't switch properly

I'm trying to use TI's LMR16006 Simple Switcher Buck Converter to regulate 48V down to 5V on my circuit. I used TI's WebBench tool to calculate component values for their reference design, and had a ...
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1answer
53 views

Digital DC DC Converter for Power Control

I want to find a way to control a power device from a microcontroller. I must control a power device from the microcontroller, making the voltage to vary betwen 0 and 28 VDC, knowing that the power ...
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1answer
61 views

buck converter with a simple bypass schematic mode?

in my design i need to place a buck converter 10-30V input with a fixed 12V output. my concern is that when the battery volatge level is low (for instance 10v) the device will stop bucking. so i want ...