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

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7 views

How do I calculate the duty cycle range for DC-DC buck converter?

Question: A buck converter supplies power to a microprocessor with a core voltage of 1.2 V and peak power requirement of 2A. The supply for this buck converter is a lithium battery with a nominal ...
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1answer
43 views

Usb input current requirements for a power bank

My project is to take solar power from a 6w/6v panel, run it through a buck circuit tuned to 5v and charge one of the LiPo power banks. I perceive a buck circuit would do better at efficiency than a ...
2
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1answer
38 views

Buck Converter Multiple inductors

I'm looking at a height constrained application, that's making it difficult to find the power inductors I need. What's wrong with say using 4 inductors in parallel to get more current? I know the ...
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1answer
30 views

Rise time and fall time calculation of an integrated switch?

Following the analysis regarding the selection of buck converter for my application (Buck converter efficiency Vs load current:). Now I am trying to estimate the power dissipated in the integrated ...
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1answer
46 views

Rechargeable battery configuration for 5V

I have 6x 18650 (3.7v) cells. I'm trying to build basic power-bank and wondering what battery configuration would be better for minimizing power loss in voltage regulation/conversion process? Edit: ...
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2answers
60 views

Buck/Boost Converters— What's the 'cost'?

I am trying to source (hopefully) a single power supply for my present project. From this single source I was thinking of using appropriate buck and boost converter circuits to fan out the various ...
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1answer
65 views

Can a CM choke be used to suppress common mode current in a DC circuit?

I have a setup with a DC/DC converter like in the figure below. I need to minimize common mode current on the supply input. There are no other connections besides Vsupply + and - and Rload + and -. ...
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1answer
51 views

Buck converter efficiency Vs load current:

Can somebody explain how does the efficiency of a buck converter increases with the increasing load current?
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1answer
44 views

Synchronus Buck Converter

So i am designing a Synchronus Buck converter 12V - 5V with 12 W of power at the output. This means that my output current will be on average 2.4 A. Now for the feedback I am using an Arduino. I will ...
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1answer
40 views

Buck converter operating frequency range:

I am looking for a buck converter IC for my project. In the data-sheet if the operating(or supporting) frequency range has not been mentioned, then how do we know about the range of frequencies it ...
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1answer
92 views

Can I measure inductor current by adding a secondary winding?

I have a buck converter and I want to add a current loop to it. I don't want to use a hall-effect sensor or something expensive like that. I think it is not practical to use a sensing resistor since ...
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2answers
36 views

Buck regulator output

The output of buck regulator is the average value of the output across the regulator. So below are my questions. 1) How the average value is coming across the load resistor practically ? 2) ...
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1answer
60 views

Current output of a solar panel when connected to battery and load

I am trying to build a microgrid (final year project) where a 100-250 W 48V solar array will charge a 24V battery bank and a couple of 24V loads (40W lights, 60W fan). Batteries used (7 of this in ...
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0answers
116 views

Why output current shoots up by 10x

Here is my hand cranked generator for charging a high voltage capacitor. How the system is designed to work is shown in the following image: It is designed to charge the 10 mF capacitor to upto 50 V ...
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0answers
62 views

Synchronous MOSFET Driver for Inverting Buck-Boost topology

I'm on project to make Inverting Buck-Boost converter. that digitally controlled using microcontroller by using feedback on ADC and send duty cycle with specific frequency on PWM pin. I'm using ...
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1answer
88 views

Battery power to 5v led strip and 3.3v controller

I'm trying to build a wireless led strip using the esp8266 controller and ws2812 addressable led strip using battery power, but I'm a bit stuck on how to build the circuit. After a bit of research ...
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2answers
58 views

Create a Time-Variable Dc Power Source

For some reason, I need a Time-Variable DC power source that changes it's value according to time. I need this changing of value to be controllable. I'll put it this way : Say I have a 12 volt DC ...
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1answer
46 views

Output Capacitor value calculation based on Transient response in Buck converter

In Buck design, The output capacitor's initial value is calculated based on how much current transient buck will support. Few equations took from appnotes. from these equations, for A given ...
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1answer
75 views

LM2576 may I use bigger or lower inductors?

I'm about to build a switching (Buck) power supply with an LM2576 adjustable IC. Input voltage 30V, output from +3V up to +28V, which should run about 100 mA - 3 A load. If I use a bigger or lower ...
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1answer
73 views

Differences Between Buck-Converter and Linear Current Booster

Thinking through a design that interfaces a solar panel to a 12V diaphragm pump, and considering the interfacing options. I've come across the term "Linear Current Booster", and wanted to explore ...
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2answers
46 views

Buck Converter Error Amplifier Input Polarity Confusion (TL598)

I'm trying to design a buck converter using TL598. I'm studying the technical article Designing Switch Mode Power Supplies With the TL598 - Application Report for this purpose. This article references ...
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5answers
413 views

What does a buck converter do with the energy that a linear regulator would otherwise waste as heat?

I've been reading for hours about how switching regulators work but I'm still unable to understand what it does to keep the power equity between the input and the output (ignoring internal losses). ...
0
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1answer
31 views

Buck Regulator IC Markings Identification

I am looking at some type of Buck Regulator chip; 12VDC in-5.0VDC out; 20-Lead, 3mm x 4mm GFN (6-leads, 4-leads, 6-leads, 4-leads; the text on it is: line 1: < 418 line 2: LGCC line 3: B824 Is ...
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3answers
99 views

What can cause output voltage of DC-DC Switching regulator(AP6502) to drop when load is applied?

I am using a DC - DC switching regulator to provide a LOAD with regulated 5V. I have followed the reference ckt provided in the datasheet but when I upload a load greater than 1A the output voltage ...
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2answers
75 views

What can cause the output voltage of a buck converter to drop (apart from high current)?

I am using the LTC3388-1 buck converter to provide a microcontroller with a regulated 1.8V voltage. I use pretty much the reference circuit as seen in the image. When I disconnect the ...
2
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2answers
47 views

Efficiency Curve of Buck Regulator

Below is the efficiency curve for the TI TPS53513(datasheet). Can someone explain what causes this characteristic efficiency curve? It seems to be similar to the one for other regulators as well. Why ...
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1answer
103 views

Simulating IR2104

I have this simulation set up in Every Circuit. It can be viewed here: http://everycircuit.com/circuit/5875415639916544 For right now I have turned off M3 by jumpering M3's gate to the ground nearby. ...
2
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1answer
211 views

DC 5V USB to replace AAA-battery source: down converter

I have a portable lithium battery-powered speaker which takes auxiliary sound input from a single AAA-battery powered pocket radio. The speaker includes a USB port for charging source devices: I ...
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1answer
94 views

how to calculate PWM duty cycle for led driver

I am trying to design a constant current led driver. I know the peak and the holding current range for led driver How would I find the PWM duty cycle based on the current that I need to control? ...
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0answers
67 views

inductor selection for DC DC

I am using a buck conv rt8298. My load is abt 5 amps. Input is 12v and output is 5v. I selected an inductor of 8.2uH. The formula tells abt 3.4uH. And sometimes it does not work. Just becos I choose a ...
2
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1answer
93 views

Buck converter design problem/confusion

I have problem with designing buck converter. I have tried to design it by using instructions from this site: Buck converter And here are my parameters: V input - 72V max V output - 12 V ...
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0answers
21 views

how to drive field winding with Buck_Boost?

In the picture that is shown as a Figure 1 obviously there is a resistor functioning as a load, and it's current(Io) as a feedback to the semiconductor (IGBT) in order for it to switch the mentioned ...
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0answers
30 views

buck boost and exciting synchronous generator

I have a Buck Boost converter for exciting a synchronous generator. the thing is that there is a load in the buck boost converter as shown in Figure 1 , everything is working good. what i want to do ...
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1answer
68 views

Calibrating buck LED driver by altering Vsens

Many switch mode buck LED drivers use a current mode scheme with a sense resistor back to a Vsens or Current Sense input on the chip. A good example is the LM3404. Here's the typical use circuit: I ...
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2answers
93 views

Help with designing negative part of Dual-Sided SMPS

For a project of mine, I'm trying to make a dual-sided SMPS that has independently variable positive and negative supply rails, current limiting, short circuit protection, etc etc... My current plan ...
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1answer
90 views

Inverting buck-boost vs. positive buck-boost

Should I use an inverting buck-boost or a positive buck-boost topology? Input voltage range = 19-22VDC, Output voltage range = 10-56VDC, Application = LED driver The app not I have says the ...
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0answers
150 views

Help with PFM with PID Control on dsPIC30F2020 (Pulse Frequency Modulation)

I'm using the dsPIC30F2020 trying to do a project that compares and contrasts PWM and PFM bucks converters. I have the PWM buck converter working perfectly. So for the PFM I used the exact same code ...
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2answers
100 views

Best way to power a 3.3V circuit from 3.3V-to-5.0V source

I'm working on an add-on board that needs 3.3V power (~500mA) and should take power from its host board. The host can operate at 3.3V or 5V and I'd like to avoid using jumpers that would require the ...
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0answers
50 views

Buck Converter with lead battery source

I have a buck converter using the ST1S14 step down converter. The design was tested with a AC to DC converter source in the lab. With 12V DC supply the circuit performed well delivering currents upto ...
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0answers
65 views

Improving PCB layout for regulator circuit

I've made a layout around an Allegro A4490 triple buck regulator, with four optimization goals: minimize loop area/change in area when switching keep the ground attachment of the input and output ...
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1answer
83 views

Buck regulator AOZ1014 getting burned

I am analyzing a buck regulator circuit as shown in following figure. link for datasheet given here: http://aosmd.com/pdfs/datasheet/AOZ1014AI.pdf I have few queries in schematic: Q1. In above ...
2
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1answer
86 views

Switching Regulator Current Conversion

Can a switching regulator deliver more current than the input side can provide just at a lower voltage? For example if I have a 10V 1A (10W) input source going through a switching regulator (100% ...
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1answer
169 views

LM2596 inverting mode to generate -5v

I am trying to use an LM2596-adjustable to make an inverting Buck-Boost power supply as per below: The circuit requires a voltage divider that is used to adjust the output voltage. In the diagram, ...
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2answers
214 views

MOSFET source to drain Current

Similar kinds of questions have been asked before it but they don't clarify how one can use this aspect in circuit. I'm aware that a MOSFET is a bidirectional device and in one direction current can ...
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3answers
85 views

Can I get constant current at the output of a buck convertor (to drive a LED)?

I want to drive a LED with a buck converter circuit as shown in the schematic below. In order to keep the circuit simple, the system will run open-loop (i.e.; there won't be any voltage or current ...
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0answers
82 views

Power micro LED's from 5 Volt USB

simulate this circuit – Schematic created using CircuitLab I'm working with this set of LED's: Link here: 30 Ft Led wire I measured the draw for the entire string at about 170 ...
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1answer
69 views

Buck and Boost drivers for LED

Many of the newer bike lights use LEDs. Although I understand basic electronics it has been some years since I learned electronic theory. Although I understand the basics of buck and boost drivers I ...
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1answer
110 views

Questions concerning Solar MPPT tracker

I am building a solar MPPT tracker. First of all: what I understood from MPPT is that MPPT units transfer the maximum power available from a solar panel at that time to the load. This can be done by ...
1
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1answer
103 views

Maximum Power Point Tracking Duty Cycle for a Buck Regulator

I'm currently building a 10W high voltage (~50V-100V) Maximum Power Point Tracking (MPPT) buck regulator on the side for educational purposes. For the time being, the output is tied to a load. ...
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30 views

AC to DC converter for 5V USB Charger [duplicate]

I have been looking around to understand how phone chargers can pump out 1-2 Amps of current through the USB port in such a small package. I am sure they do use a transformer for isolation. One of ...