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
56 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
20 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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2answers
39 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
32 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 ...
-1
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1answer
55 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
27 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
27 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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0answers
24 views
Synchronous buck converter and half-bridge mosfet driver? [closed]
I have a synchronous buck converter with MPPT and I am looking for driving two N-Mosfets. since the battery voltage is always present, most drivers don't work. I could not find a half-bridge mosfet ...
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1answer
31 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
78 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 ...
0
votes
1answer
47 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 ...
0
votes
1answer
54 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 ...
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3answers
58 views
Buck converter, duty cycle has inverse relationship with Vout?
I've been trying to design a DC-DC step down (buck) converter for a school project, and have been getting unexpected results. I'm using a PWM signal from an arduino to step down the voltage, and have ...
2
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4answers
151 views
300VDC to 24VDC voltage converter - Cheapest implementation
In an application, 100+, 100W 24V halogen lamps need to be individually controlled and run simultaneously. They stay on for a few seconds at a time and need to have very constant irradiation.
...
6
votes
2answers
1k views
Buck converter MOS Drive resulting in overheat
With the schematics below, which is a low side driven DC/DC buck converter similar to this post:
The LINE voltage is about 300 VDC and controls a 24V halogen lamp connected to J1. C2, C3 are rated ...
1
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1answer
72 views
Current sensing techniques in SMPS
I have gone through the following circuit provided by microchip technology and I get trouble in understanding the circuit circled in red the the image!!
As I understood, this circuit is used as a ...
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3answers
89 views
Which is more efficient: A much larger than needed step-down voltage converter, or one rated closer to the actual load?
I'm designing a custom audio system for my electric motorized pedicab. The motor of my cab runs on a 48 V 33 Ah battery, and I have planned to use a 48 V to 12 V step-down converter to simultaneously ...
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0answers
29 views
Using a laptop battery with a buck converter with current limiting
I am building a smartphone-powered laptop similar to this. The case is an old HP Pavilion DV4000 that I got. I would like to use its battery for this project, because laptop batteries already have ...
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3answers
41 views
Strange LED flicker when powered via buck converter
I have a 12V supply with a buck converter stepping down 12V -> 3.3V to power an esp8266 microprocessor.
The esp is controlling a 12V LED strip switched via 2n2222 transistors. When all LEDs are ...
2
votes
1answer
80 views
Will a buck converter allow current to pass through if Vin is less than the configured output voltage?
In general, will a buck converter allow current to pass through if Vin is less than the configured output voltage?
Specifically, I'm reading the TPS54308 datasheet and I'm not seeing an answer to my ...
2
votes
1answer
89 views
LTM8073 integrated DC-DC buck converter issues
I have a board with two LTM8073 "silent switcher µModule regulators" by Analog Devices/Linear Technology being used to provide two separate power supplies. This is a 10-layer dual-sided board that was ...
0
votes
1answer
48 views
Switch for low voltage, high current Shape Memory wire
I need a switch to allow current to pass through a wire to Joule heat it. This is a nickel-titanium wire (Shape Memory Alloy, SMA) which has been programmed to bend into a particular shape when heated....
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0answers
26 views
1V Overshoot and Undershoot on Power Rails of LTE Module
I have designed a PCB (four layer) having SIM7600I LTE Module. The Stackup is:
Signal & Component Layer with Ground Pour
Internal Ground Power Plane
Internal ...
0
votes
1answer
30 views
Voltage drop across buck converter
In my robot, I plan to have a GPIO pin on my Raspberry Pi connected to the insertion detection pin (pin 3) of a barrel jack (schematic here) so that my code can tell when the robot is externally ...
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0answers
45 views
Buck Converter Load Regulation
I have attached a schematic of a buck converter circuit I have designed. It's designed using a LMR16030 IC.
Input voltage: 12-14V
Output voltage: 5V
Switching frequency: 1MHz
Output Current: 2A
I'...
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votes
2answers
56 views
buck converter current control - how?
I am interested in understanding better how the regulation for a buck converter works, I don't understand it now and havn't found litterature really explaining it so far, so I am asking you here.
The ...
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0answers
50 views
high voltage buck converter
I'm a second year EE student. I was trying to make some circuits by my self.
I wanted to make a Buck-converter, from mains. I'm from India. Here mains are 220v to 230v 50Hz. My aim was to attain a ...
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1answer
44 views
LC ringing on synchronous buck converter
I am working on a board that uses LTC3891 as a buck converter to step down 24V to 12V. There is quite a significant oscillation at the switching node, upstream to the inductor which I am curious about....
5
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4answers
501 views
Achieving MPPT of a solar panel with LM2596
im having some trouble with DC converters in a solar system.
I have a solar panel of 21V (Voc) and 1.33 (Isc).
I have studied that with a DC buck converter with input regulation (Feedback loop taken ...
1
vote
1answer
57 views
Magnetic Field around step-down converters [closed]
I'm courious how strong is magnetic field around step-down conveter? My plan is to use one LM2596 @ 12V(1A at maximum load) and one LM2596 @ 5V for STM32.
I Know that coils generate MF around itself ...
3
votes
2answers
298 views
LM22678 Unstable output
I am building a voltage regulator with the LM22678-5.
I used TI WE-Bench designer to get the component values needed for the regulator:
The regulator outputs 5V when there is no load however it ...
0
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0answers
29 views
Flyback, primary inductance selection for wide output current changes
I would build my first flyback converter.
Converter would be designed for 2A max and load device would draw about 100-200mA for most of the time with 1.8A peaks. Peaks would take a little longer so I ...
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1answer
41 views
What does the ripple frequency of a buck converter indicate and how does it affect the DC device connected to its output?
What is the desired ripple frequency for buck converters connected to computers, networking device as power supplies?
Can we judge the quality of power supply from ripple frequency? (buck converter ...
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1answer
120 views
Buck converter MOSFET getting hot
I am building a solar charge controller. I have based the design on pwm5 by Julian illet (circuit diagram attached). I am trying to convert this PWM charge controller in to a mppt one.
The buck ...
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0answers
46 views
600V buck converter starting circuit
I'm trying to design a control circuit for the following problem.
After pressing a mechanical switch, a 24V battery kickstarts my circuit that triggers the high voltage system by toggling the HV ...
3
votes
1answer
122 views
Cause of high failure rate in SC189 buck regulator
I have a small board that uses the SC189C buck regulator to take 5 V down to 3.3 V. For whatever reason somewhere between 25% and 50% of these boards have had the voltage regulator fail at some point, ...
0
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1answer
33 views
The way to efficiently operate some power devices with less loss, and appropriate heat sharing
I'm using a buck converter(OKR-T/10-W12-C made by Murata Power Solutions). The converter supports 4.5 ~ 14.0V input.
The input is 9.5V voltage from the another buck device.
And between of them, the ...
9
votes
2answers
289 views
Buck converter, squeaking/whining inductor
I have a problem with my homemade buck converter. It is based on a TL494 control chip with my discrete MOSFET driver. The problem is that my inductor squeaks and whines, when the output current ...
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vote
2answers
142 views
Torque and speed control of a DC motor
I'm new to electronics and this is my first post so please be patient with me.
Introduction
I am required to design a rehabilitative exoskeleton-like knee-brace to assist sit to stand, I have faced ...
2
votes
2answers
95 views
Measuring the resistance of USB car chargers
I have a few USB chargers that are powered through a 12 V car receptacle. I measured their resistance with a multimeter, applying the probes to the contacts of the 12 V input.
One of the chargers had ...
3
votes
1answer
111 views
How does the coupled inductor, capacitor and diode combination work?
I was reviewing a buck regulator circuit. Circuit was designed for 3.3 V output (Vout1)
simulate this circuit – Schematic created using CircuitLab
From this buck regulator output, a coupled ...
1
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0answers
98 views
Controlling Buck converter (XL4016) with microcontroller
Briefly the project I'm working on is made up of a blue pill, rotary encoder, acs712 30 amp current sensor and an OLED display. Everything is in functional state. The aim is to provide a stable ...
1
vote
2answers
44 views
Something wrong with open USB circuit, electrostatic problem
I faced a strange problem with the following circuit.
I'm using some buck converters and an Arduino. The buck converter (Vout = 5.25v) is for a USB charger (up to 2 Amps). Well, I think the circuit ...
0
votes
2answers
98 views
12v to 1.8v 3.3v 5v
I'm fairly new to electrical engineering, tried my hand at a power supply circuit based on the Texas Instruments buck converter TPS65261RHBR. Goal is to step down from a 12V lawnmower battery to ...
1
vote
1answer
35 views
Input and output oapacitor for PoE + DCDC controller
I am trying to design a PoE solution using MP8007. It has an integrated PD interface and isolated/non-isolated DC-DC Converter.
The DC-DC converter uses fixed peak current and variable frequency ...
0
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0answers
42 views
Making sure power is supplied from a DPS5020 fast enough for an induction board to oscillate
Apologies in advance - I'm a software guy who likes to dabble here and there and my latest project is a little beyond the comfort zone.
I'm building an induction heater (with off-the-shelf parts for ...
1
vote
1answer
98 views
Why does the PWM signals amplitude drop once connected to low-side n-mosfet switch?
I am applying a 3.3 V pwm signal to a circuit similar to the following (Credit: Olin Lathrop):
I am using an IRLR024N N-MOSFET, which switches if i connect the gate to the 3V3 pin of my ...
1
vote
1answer
63 views
Questions on Inductor Selection guide from TI [closed]
I have been researching on Selecting inductors for Buck Application and came across an Application report from TI.
I have few questions which are listed below:
On ...
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4answers
73 views
Multiple Buck Converters
I have multiple buck converters, model XL4005 (datasheet ), fed from a 12V battery source to several devices i.e. My motors (require 12V), Arduino (requires 5V) and Transmitter module (require 3.3V). ...
0
votes
2answers
164 views
How can I remove 1.4MHz and 150kHz switching noise?
(Please excuse my English)
I have two types of DC-DC step-down(buck) converter modules, and the switching frequencies of the converter modules are 1.4MHz and 150kHz each.
The two converter modules ...
