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

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24 views

Why should I bother with Frequency Response calculations in a Spilt-rail buck regulator design?

I'm looking at an existing implementation a split rail step-down power supply (application report). I would like to know what's the big deal with frequency response in the reference design? I think ...
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3answers
42 views

The role of reference voltage in buck converters?

I asked a question here which made it quite clear that it's probably not a good start to make something that I plug directly into the mains. Instead, I've decided to build a low-voltage buck ...
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3answers
98 views

Buck converter based switching power supply?

simulate this circuit – Schematic created using CircuitLab I have designed this circuit based on a buck converter. I'm just having trouble finding out which values to plug in. I.E. C1, ...
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1answer
37 views

Summer camp project questions - bike charger

For a summer camp, I am building a bike-generator. Well I have found a few articles about that on the internet, but I have put together a list of questions and I would be really appreciated if someone ...
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1answer
54 views

High current Synchronous Buck Converter, MOSFET or IGBT?

I am supposed to design a synchronous buck converter (to be driven by micro controller control signals for switching purpose). The input Voltage range is 10V-15V, and output voltage range is 4V-5V but ...
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1answer
37 views

Sanity check my first project: to control my air conditioner with a Nest

I have a window air conditioner. It works well but is a bit old — new enough to be electronic, have a remote and a digital display, but not new enough to turn on from my phone or do anything smart ...
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0answers
18 views

How does Mean Well LDD range DC-DC constant current drivers handle dimming?

Mean Well LDD range DC-DC, constant current buck drivers have dimming function. 5v PWM signal allows you to dim the LEDs. Without PWM, you get the full rated current output. Now knowing anything ...
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1answer
22 views

Periodic Steady State voltage Buck Converter

What does Periodic Steady state mean with regard to a Buck Converter ? Does it mean the normal operation ? Also, From what I read, the net change in the capacitor voltage in the buck converter is ...
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1answer
45 views

Basic MOSFET question

I am using a P-Channel MOSFET to build a buck converter and change 12VDC, 2A (from a 12V battery) to 5VDC, 2A (for cell phone charging), should I use a MOSFET rated for 20V, 2A or -20V, -2A? I am new ...
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0answers
45 views

Bidirectional Current converter, discrete or IC?

I read in a post (Bi-Directional Buck Boost Converter) that for bidirectional current converters when a higher current is needed, external deiscrete FET transistors have to be used. Like one on the ...
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0answers
77 views

Arduino Controlled Buck Converter

I am building a circuit which consists of a buck converter's duty cycle being controlled by the PWM output of an Arduino. Essentially the Arduino generates the PWM signal from two inputs-the input ...
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0answers
36 views

Suitable Value of output Inductor at buck converter

i have a buck converter circuit , it is for ac to dc converting and use for driving led, DC is constant current type , give constant 300ma , voltage is variable due the how many led are used but max ...
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2answers
121 views

How to control a buck-boost converter circuit from a microcontroller?

I'm reading about buck-boost DC-DC converters lately and one thing is still not very clear for me. Most of the converter ICs that I've seen have a feedback loop input pin. For example LTC3780 requires ...
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1answer
82 views

Buck-boost converter dropping source voltage

I have two solar panels connected in series, and I'm using them to charge a phone. Together they provide about 7 V when I connect their leads to a multimeter or a basic circuit (i.e. Resistors/etc.). ...
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0answers
12 views

Step load estimation/measurement in a complex circuit

Let's say you have input buck regulator that provides a system rail which is loaded by various other regulators (LDOs, switchers) which power CPU/Memory/RF systems etc, and direct loads (speaker ...
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1answer
54 views

How to reverse the direction of operation of the motor?

For Synchronous buck, half bridge converter, how to reverse the direction of operation of the motor? That would be great if you could explain me with the circuit diagram.
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0answers
18 views

Bidirectional buck stepdown

Does any one know if you get bidirectional buck step down modules. I have found this: ...
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2answers
57 views

DC to DC step-up boost converter compensation pin, what values to use?

Okay, so I decided on a DC to DC boost converter but am having some difficulty figuring out what values to use for the compensation pin capacitors and resistor. The data-sheet really does not go into ...
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0answers
47 views

Battery charging via Buck or LDO?

I am supposed to charge a Li-Ion battery (12V 50Ah) and then discharge it over a period of time for testing purpose to measure its efficiency. And this charging and discharging is to be done using ...
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2answers
101 views

P-type MOSFET is not turning off

I am designing a buck converter as class assignment as shown in figure. I have calculated all the value of inductor and capacitor. I am applying PWM to the input of MAX627 MOSFET driver through ...
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1answer
43 views

USB powered Switch Mode Li-ion Charger

I want to design a Switch Mode Li-ion charger which uses 5V as input and charges a single cell Li-ion cell. I am referring this AppNote On page 4 they have given the equation to find inductor value ...
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2answers
283 views

AC Power loss of inductor in a buck converter

I have a custom piece of equipment that gives a value for AC power loss (Pac) for an inductor plugged into an internal buck converter circuit. The custom equipment has an oscilloscope which is ...
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0answers
28 views

formula of finding maximum output capacitor for buck converter

If we are asked to calculate maximum output capacitor, does the formula of finding capacitor applies the same to both maximum and minimum? Or is the equation totally different?
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1answer
80 views

Buck converter not working

I designed a buck converter on breadboard as shown in the picture. I am applying PWM from my microcontroller. I am not sure why this circuit is not working, I have spent so much time on it. Is there ...
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1answer
70 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
72 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
42 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 ...
0
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1answer
64 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
51 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
69 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
94 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
65 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
49 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 ...
0
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1answer
41 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
104 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
63 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
84 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
121 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
95 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 ...
1
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1answer
116 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 ...
0
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2answers
64 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 ...
0
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1answer
81 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
104 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 ...
0
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1answer
111 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 ...
0
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2answers
63 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 ...
2
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5answers
439 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
34 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 ...
1
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3answers
108 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 ...
0
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2answers
94 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
48 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 ...