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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Power Supply Validation - What Matters?

When it comes to validating a power supply (for example, a buck regulator), what parameters matter? From the research I have done, I think that things such as ripple voltage, percentage overshoot ...
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How does soft-start in a buck converter help reduce inrush current

Consider a synchronous buck converter that is off, inductor voltage is 0, capacitor voltage is 0. The moment the high-side switch is turned on for the first time (no matter for high long). There will ...
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Using an NMOS for a high-side switch in a buck converter

I know that to use an NMOS as a high side, you need a gate boosting circuit! I am just here to check my understanding on what WOULD happen if I did use an NMOS device without a boosting circuit and ...
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High-current AC-DC converter [closed]

I'm searching for a SMPS circuit with a 220 Vac input and a 12..80 VDC adjustable output. The hardest requirement is the maximum output current must be >20 A. Ideally it would be 80 A.
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Voltage regulator equation

I'm designing a circuit using this buck regulator (AOZ2253TQI-20) from Alpha & Omega. Data sheet here, http://www.aosmd.com/res/data_sheets/AOZ2253TQI-20.pdf The data sheet doesn't specifically ...
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DC DC converter from low voltage to high voltage [closed]

I need your help here. I will be starting a new job where my main tasks would be designing a DC to DC converter with an output of up to 5 to 6 kW. I have never designed a board with such high power ...
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Power issue with NRF24LO1 and ATtiny44

I am super frustrated with my NRF24LO1 module and ATtiny44. The thing is when it is connected to an Arduino board it works perfectly, but when I try powering up using battery the entire system halts. ...
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Single buck converter for multiple fans with different speeds?

I need to switch a 3d printer motherboard which controls some fans, the new one outputs 24V instead of 5V, but each fan is 5V. Each fan will need to be spun up/down independently from the other two. I ...
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Would increasing the load resistance in a buck converter increase efficiency?

I was recently asked in an interview if the efficiency of a buck converter would change based on changing the load resistance (I assumed this meant constant input and output voltage). I answered that ...
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synchronous buck simulation

I got confusing result from hspice simulation but I can't get it. the voltage at "N1"should be 4V when W1 on,and be 0 when W0 on. but result is always 0 and pulse of negative voltage. below ...
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Can anyone help me with this delay problem in my UPS circuit?

I am trying to build an UPS for my laptop. My laptop doesn’t have a battery and battery port is damaged, only way I can power my laptop is from the DC port. But the problem is where I live power ...
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PSRR of an amp + ADC input stage

I have an input stage that consists of an amplifier then an ADC. The op-amp and ADC are powered by Buck voltage regulators. I want to measure the PSRR of this stage, so I am planning on breaking the ...
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Buck converter bias supply

I am using an MP2325 buck converter (datasheet) to drop a 24v supply down to 5v to supply a Raspberry Pi. The datasheet above details ...
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DC-DC buck converter duty cycle issue [closed]

I want to make DC-DC buck converter with a PWM controller, gate driver, and MOSFET switch. But I can't find the PWM controller that matches my requirements: input voltage 40 V, output voltage 24 V ...
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132 views

MOSFET failure in a high power AC-DC SMPS buck converter

I've made a AC-DC step down buck converter that converts 220 VAC to a variable 45 to 70 VDC at 5 to 10 A to charge a Li-Ion battery. I'm currently using ESP32 to drive a MOSFET driver (IR2110) to ...
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Coupled inductors for multi-output buck

I see coupled inductors are generally used in multi-phase design to take advantage of current ripple cancellation. What is really the advantage of coupled inductor in multi-output buck or multi-output ...
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Why use external compensation on a buck IC?

The AP64200, with block diagram of says about loop compensation that The goal of loop compensation design is to achieve: High DC Gain Gain Margin less than -10dB Phase Margin greater than 45° Loop ...
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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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Buck converter simulation Vout lower than expected

I am trying to design a simple buck converter in LTSpice. Here are my parameters: ...
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3 answers
92 views

STM32 Low Quescient Current Power Supply

I want to find the most efficient way to power an STM32 microcontroller from a lipo (3.7V nominal). I have calculated that @ 3.3V, the current consumption is approximately: in run mode:1.75mA in idle ...
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Step down converter with low side MOSFET

I'm trying to gain confidence with electronic as I'm quite new to this world. To get started I began to study a buck converter which I'm simulating with LTspice. The problem is that the design that I ...
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How does the COMP/EN pin of the MAX1967/MAX1966 work?

I know this question may seem simple to more experienced people but I struggle to understand how the COMP/EN pin works on this particular IC. I want to use it for a buck converter that has external ...
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Why is my buck converter stimulation not working on proteus?

Why is my proteus stimulation only outputting the voltage and current zero when I connect the ground terminal - shown at the bottom right of the image, when I do not connect the ground terminal the ...
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2 votes
4 answers
497 views

What is the difference between voltage regulators, resistors, and buck converters?

I am new to electronics and I would like to know the difference between voltage regulators, resistors and buck converters like the LM2596 and their advantages, disadvantages and use cases. I tried ...
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Flybuck circuit

Needing a dc to dc converter, I thought of using a "flybuck" circuit, I stopped at the IC "AOZ3015AI" (https://www.tme.eu/Document/0262838228a45307035e45b4effa9bb7/AOZ3015AI-DTE....
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Reduce the heat output of a MOSFET (buck LM5085)

First of all I have to say that I am a beginner, and I don't have an oscilloscope to work with. Just a multimeter. I'm trying to design a PoE+ board with a 9.5 V @ 3 A output. The PoE+ part works fine ...
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DC-DC converter/step down layout improvements/feedback

I'm designing a board with a 12V to 5V DC-DC converter circuit and I would like some feedback on how it can be improved. As it is the first time I have designed such a circuit, I'm not the most ...
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2 votes
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Buck converter with interleave yields wrong output voltage in simulation

It isn't obvious to me how to solve this by hand (if anyone knows I am very interested), so I thought of simulating it instead. We need to know some values, though: Duty cycle of switch A \$D_A = \...
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Buck converter after boost converter -- what is an advantage?

I encountered a mass produced device that has a power circuit like this:    5V from USB ==[boost converter]==> 13V ==[buck converter]==> 12V and it confused me. I don't see why you would need a ...
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Startup transient on LMR14030-Q1 buck converter

So I'm trying to build my first buck converter for an audio project using a TI LMR14030-Q1. My first design had some acoustic noise so I changed the switching frequency, inductor, and output ...
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Acceptable overshoot, accuracy, and control bandwidth of a buck converter

I am designing a closed loop buck converter and was wondering what would be the acceptable values/performance for control parameters like accuracy, control bandwidth, and overshoot. I know that the ...
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Buck regulator thermals calculations

Schematic: Specification: Vin = 24V Vout =5V Iout max = 8A Freq = 0.691 Mhz Assumptions: Good layout and FETs mounted on 1-2 inch^2 of copper. Calculations based on this doc: https://www.ti.com/lit/...
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I would like to drop a variable DC voltage from input 30Vdc to 200Vdc to output 5Vdc with a max 200mA

I am new to electronics and would like some help if possible. The incoming voltage will be variable from 30Vdc to 200Vdc coming from a bank of solar panels. The output is 5vdc at a max of 200mA. I ...
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Question on resistor voltage dropper values for VCC supply of LED driver IC

I was designing the PCB for a 10 W LED driver with the AL1676 controller. From the datasheet, the application circuit shows that the driver takes its VCC supply through R1 and R2. The maximum value ...
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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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2 votes
1 answer
194 views

5V and 12V derived from a regulated 12V supply? Buck converter for 5V, in parallel with 12V load?

Apologies up front — this is super basic, but I’m sleep deprived and on a deadline for a personal project. This is all DC. I have a 12 V input (via a wall-wart). I need 5 V to power some electronics (...
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1 answer
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Critical inductance for buck converter

I have this problem: - The critical current must be \$P_{out} = V_{out}I_{crit} \Rightarrow I_{crit}=\dfrac{45\text{W}}{16\text{V}} = 2.8125 \text{A} \$ Using eq. 3.43 from Ned Mohan's book we have $$...
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Input current and output current in boost regulator

How can the input current of a boost regulator be more then the output current of the same regulator when the load has a set current draw. For example going from 5V to 12V with a load of 2A. The power ...
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2 answers
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Adjust regulator to output lower than its feedback reference

I am designing an adjustable high current buck converter. The input voltage will be around 12V, but the output needs to be adjustable in the range of 0.2 to 10V. I have decided to use the LM27402 (...
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Buck Converter Voltage Ripple at Output

I just made a 32V to 16V 2 Amps buck converter with a 10mH inductor, I'm having an issue with the voltage ripple output. Too many spikes, and it's generally not consistent. Electrolytic and Film ...
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Tricking feedback of a buck converter

I need to trick the buck converter feedback. The converter that I am going to use is TPS40192DRCT. Instead of the regular resistor divider, I want to feed there voltage proportional to current ...
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3 answers
369 views

Switch mode power supply vs DC-DC converter

I have started learning about DC-DC converters and switch mode power supplies (SMPS.) I know that the standard SMPS (attached fig. below) has an input rectifier, DC link capacitor, inverter, output ...
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Regulator controller current capability

I am tasked with the design of a board that needs a buck regulator. This regulator will work on low voltages (Vin ~= 12V, Vout ~= 4V), but high output current is required (> 60A). I decided to use ...
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Inductor and specs for a buck converter at low currents - high r

I'm currently designing a buck converter using the AP64501. This issue/question is not specific to that buck however. I have a python script that I wrote that uses the formula's in TI's appnote: AN-...
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2 votes
1 answer
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How to buck 120V DC to 56 DC?

I'm working on a project to power a 56 volt BMS with a buck converter that bucks 120V DC (rectified from 120AC) to 56V DC, but I've gotten to the point where I'm hard stuck. Here is what I have so far....
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3 votes
2 answers
319 views

Frequency Response of Ideal and Real Type III Compensator

I'm trying to develop a Buck Converter with a Voltage-Mode Control, using a Type III Compensator, just like the one below. So I calculated its transfer function, and then with the correct values of ...
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Inductor position in low side buck converter

I am designing a PCB to control an RGBW-LED. To provide a regualted current for each color I am using the LM3407 buck converter from TI. The buck converter is powered with 12V and is configured to ...
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Buck converter driver LTC4446 running too hot, too high current

I am trying to design a buck converter, but the driver LTC4446 is getting to hot with this design and the input current is also to high (130 mA), when it should be in the uA orders... Any ideas of why ...
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Buck converter: Additional circuitry working not clear

Saw the below schematic of a buck converter, but not able to figure out the working of the marked section. It is shown Node 1 is at 16 V. Looks like sensing the differential voltage across inductor, ...
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Is it true that power supply design is difficult when input voltage range is wider?

During power supply (buck converter) testing, I had seen the lowest efficiency values corresponding to highest input voltage. I thought if the design meets this worst case scenario, it should be ok no ...
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