Questions tagged [buck]
A non-isolated DC-DC converter topology which outputs a voltage less than or equal to the input voltage.
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Buck Converter Feedback Loop - Stability Criteria
Question 1 :
I am having some trouble understanding the Stability criteria of the Buck Converter Loop Stability which says, "The cross over frequency should be less than 1/8th or 1/10th of the ...
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LTspice transformer and buck converter
I am trying to simulate an efficient circuit to take 120 V AC at 60 Hz and convert it to 5 V, 5 A. I have a transformer and rectifier circuit to get the 120 V down to about 12.6 V DC and I made a buck ...
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Variable switching duty cycle for buck converter even if input voltage and output load is constant
I am testing a BUCK converter and observed that has a variable DC when supplied at input voltages lower than 9.5V (if input voltage is higher than 9.5V the BOOSTER stops and DC is constant). The BUCK ...
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DC-DC converter circuit LM5164
I would like to build a DC-DC converter circuit using EasyEDA that can output about 80V from 7 Nissan Leaf battery modules that are about 55V nominal.
I am looking at the datasheet for the LM5164 and ...
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LM5013 buck regulator won't have high duty cycles
I have made a PCB with the LM5013 buck regulator, but can't seem to get the output voltage high enough. The goal is to be able to adjust the output voltage using the LOAD_REGULATE pin, for a variable ...
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Boost converter two different voltages (9v/12v) from 3.7v battery, attach both to battery, or daisy chain off 9v
I'm sure this has been answered plenty before but I cant seem to get the search terms. I'm wanting to use a 3.7v battery to power a small 9v device and a 12v device at the same time using a boost ...
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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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Current Drawn from Bulk Capacitor at LED-Strip Output
I want to design a power supply (buck converter) which converts 9 V to 5 V and supplies it to the LED strip. The LED strip is a basic 1 meter long 70 LEDs/meter WS2812B strip. In my project, I want to ...
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Is the zeta DC-DC converter topology scalable to 50kW / hundreds of amps?
Question
The task at hand is to build a 50kW (e.g. say 125VDC 400A out) DC-DC converter that charges a large lead-acid stack with said 400A and accepts a somewhat wide input voltage range. With that ...
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Variable DC-DC Buck Converter not working
I am building a variable power supply based on https://www.ti.com/tool/TIDA-050012
There are three GPIO signals that go to the MOSFET. The USB controller toggles one of the three GPIO signals to ...
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TPS54383 Thermal Pad
I'm experimenting with a TI Dual Output Buck Converter, the TPS54383. In section 11.3, on page 43, the datasheet says
11.3 PowerPAD Package
The PowerPAD package provides low thermal impedance for ...
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NCP3420 failing in buck converter
I designed a constant current buck DC-DC super-cap charger with the NCP3420 as a dual MOSFET driver. The current is hysteresis controlled and the disable and PWM lines are pulled low on power-up.
The ...
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What should I do when clearance boundaries overlap with SMD pins?
I am brand new to layout design. I am using the TPS62136RGXR buck converter in my design. However, according to the attached image, the pin's clearance boundaries (0.2mm according to JLCPCB's assembly ...
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Powering buck converter using charged capacitor
Is it possible to design a buck converter using a charged capacitor to get regulated voltage output? When the capacitor voltage falls below some threshold value the inductor should be able to provide ...
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LM2596S-ADJ DC to DC buck converter
Does the Schottky diode current rating affect the performance of a DC to DV buck converter when loaded? I'm using a 1N5822 Schottky diode instead of a 1N5825 on a National Semiconductor LM2596S-ADJ ...
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How do I use the TPS5403 DC-DC buck to get 3.3V output from a 5-15V input?
I am trying to use the TPS5403 (datasheet) buck converter to power an ESP32 at 3.3V from an input of 5-15V, however, I can't find enough resources online to be sure in my design.
Below, I have ...
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Using a capacitor to handle the inrush surge power of a fridge
I have a household mini fridge connected to my off grid electrical system, and recently I bought a smaller inverter just for the fridge so that I can turn my larger inverter off to reduce power ...
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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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Closed loop control buck converter
I have a buck converter of 400 V input, 200 V output, 300 kHz switching frequency, power output 100 W. I am trying to put it into closed loop voltage mode control. It is working DCM mode. Modelling ...
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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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Peltier cooler driving circuit
To prevent closing as duplicate immediately, there is the list of the most relevant questions:
How to drive a Peltier element?
Driving a Peltier w/ PWM or analog out
Driving a Peltier element with ...
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Grounding microcontrollers, signal and logic level wires in a vehicle with buck converters
I sketched out my main installation in my project vehicle. To summarize, it runs with isolated DC converters, one gets the input from main battery (standard 12V lead acid) and converts it to clean ...
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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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Can I connect buck boost converters back to back?
I need to power a Bluetooth speaker (Beatbox Portable) with a battery pack while also allowing DC power in.
I also want to use the input DC power to charge the four cell lithoum ion battery pack.
Can ...
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Buck converter waveform
It became very hard for me to understand the concepts associated with buck converter waveform. What is the role of capacitor in its output terminal? Is it used for smoothing the voltage ripple? Why ...
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How to control the transient output current of a synchronous buck converter?
I am dealing with the following problem,
I want to control the output current and voltage of a synchronous buck converter during the output load (resistor) step change. Suppose we set the output ...
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Please offer comments, critique on self-resonating invented buck joule thief converter for third world use [closed]
Even though I'm not an EE, I have simulated the Joule Thief to death in LTSpice, but I have not yet made a prototype of this circuit. I have a friend who is an EE who won a contract to light some ...
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Current sensing in DC-DC converter
I studied DC-DC converter in peak/valley/average mode control and I have a question about the methodology to sense the current in average current mode control. I saw lot of paper about DCR sensing but ...
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Should I limit inrush current of this MOSFET buck regulator?
I am building a digitally controlled constant current switching power supply. This circuit will deliver no more than 105 Watts at around 20V from an AC-DC DIN rail SMPS of 250W.
You can see and ...
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IR2104 not producing PWM signal
I made this simulation circuit by the reference of its datasheet. I want to simulate the input PWM signal from MCU (ESP32) and control on/off of IR2104 by ESP32 too. But the problem is, this circuit ...
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Drop voltage from 4s Li-ion (16.8v) to 15v and lower for 12 DC-AC Inverter
I am making a high capacity battery bank that uses a 4s Li-ion cells from a car manufacturer. With Li-ion there is no 12v direct drop in replacement as it ranges from 16.8 full to 12.8 empty. So here ...
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Bootstrap Capacitor in Half-Bridge
https://www.ti.com/lit/an/slua887a/slua887a.pdf
In the above app note:
Can someone explain what the IHB_fsw term repersents?
How is I_HB different to I_HBS?
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DC/DC buck regulator regularly emits an audible clicking noise
Relevant TI forum post with no resolution: here.
I am using an AOZ2264NQI-11 chip to convert 24 V down to 12 V. I originally designed this circuit for use with an AOZ2261NQI-12 chip, which has an ...
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Buck Boost Driver to switch 2 LED chains
simulate this circuit – Schematic created using CircuitLab
I'm working on a project to turn 2 LED strings (each containing 6 HB LEDs).
Here is my question.
The Buck Boost driver I'm using is ...
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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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Getting "Too few nodes" error
While I am trying to simulate this LM5164Q buck converter IC exported from TI, I'm getting the too few nodes error. How to rectify it?
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12V to 5V buck converter - why did my IC fry?
I assembled a 12-to-5V buck converter from an LM64460-Q1 (datasheet) based on the design that Webench produced (design below).
I attempted to slowly (safely) ramp up input voltage with no load ...
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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 ...
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Fan control using buck converter
I have a 12 V motorcycle battery hooked up to a buck-boost converter, giving me a constant 12 V supply. This buck-boost converter is then hooked up to a normal buck-converter giving me 7.5 V. I know I ...
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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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Non inverting buck boost transfer function
When considering the compensation of a non inverting buck boost (single inductor), the datasheet considers to take into account the worst transfer function between the buck transfer function and the ...
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Driving a P-channel MOSFET with high voltage input
I designed a buck converter as an MPPT charger using high side switching. It seems the signal on the gate of the MOSFET good. If a solar panel with low voltage like solar MPPT 18volt there isn't a ...
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54 V to 5 V using LM2576HV
I have a requirement to convert 54 V battery output to 5 V. My battery's positive terminal is grounded. I tried the connection as mentioned in the datasheet which is attached here, but as soon as I ...
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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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Single input dual output simulation help
Ive been using PSIM and there is a problem with the circle mosfet wont turn on. Ive the correct duty cycle and input voltage is higher than the threshold. Can someone simulate it on another simulator ...
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What is an intuitive explanation on how a buck and boost converter transfer energy?
I can understand how a buck converter can step down the voltage but only with the formulas. I am struggling to understand intuitively how the inductor stores energy and releases it in a way so that ...
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Powering 24 V and 12 V device simultaneously from two 12 V batteries
I have two devices which need to be battery-powered (remote area, no grid power available). One device requires 24 V, the other requires 12 V. Both are very low amperage (~50 mA).
Can I use my two 12 ...
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Question on Turn-off Snubber Operation
I'm struggling to understand how this snubber circuit reduces power loss during the off time for this buck converter. Anybody able to explain it's operation / what is happening for each component ...
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Buck converter (LTC3330) voltage spikes in output voltage and in PGVOUT during transient
I am using Linear Technology LTC3330 (2048A evaluation board) buck converter with VIN thresholds set at 10V and 5V. The output set voltage is 3.3V. Inductor is 22uH. The input capacitor is 200uF and ...
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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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