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

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27 views

Making an LM393-based adjustable voltage buck converter

I recently saw this circuit for an LM393-based adjustable constant-current buck converter intended for driving 1W or 3W LEDS and decided to build it. It worked very well, and I was wondering if it ...
3
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2answers
39 views

LC circuit of buck converter in nRF8001 datasheet

In the datasheet of the nRF8001, they specify in the reference schematic (page 51) the LC circuit to use with the integrated DC/DC converter (see below). Why is there a small inductor L5 in series ...
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2answers
48 views

Buck Regulator Supply From Multiple Sources

Hey Electrical Engineerers! I am currently working on making an LED tail light for an older car. Overview of the Taillight Each tail light has 4 inputs connected to it: Park, Brake, Turn, and ...
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39 views

Single Buck Regulator for Multiple Circuits

Currently working on a project that involves 4 separate circuits that light up LEDs on one tail light PCB in an automotive application. Due to the high cost of a buck regulator circuit, we have ...
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1answer
46 views

buck converter, no load start

I've been working with a buck converter since a few weeks, I've tested it with load and it works just fine, but today I've measured the output with no load and saw some unexpected behavior. ...
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1answer
66 views

Remove the load of buck converter

I have a buck converter that is delivering 6A to a load of 3ohm load. I'm measuring the output current and stop increasing the dutty cicle when the current reach 6A, at this moment the output voltage ...
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3answers
370 views

Power MOSFET gets hot while driving Peltier by step-down buck voltage converter

I have a TEC1-12712 Peltier element, which I am driving using Arduino microcontroller through IRFZ44N and buck step down converter (to smooth PWM). Overall, circuit consists of: 12V, 8.5A max DC ...
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0answers
50 views

Buck converter control

I'm using a buck converter to power a resistive load, the requeriment I've is to increase the current progressively, to do this I'm using a uC. Converter specifications are: Input voltage: 28V ...
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1answer
54 views

What drawbacks to bucking, then boosting the same current?

Are there any real negative drawbacks - outside of the double drop of efficiency - of DC-DC boosting a power line that was already DC-DC bucked? I'm building a modular system, serially linked through ...
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26 views

What are the risk of overload a inductor in buck converter?

I've a buck converter working at 100kHz simulate this circuit – Schematic created using CircuitLab So far I have tested the circuit for a 4A output current, but I may need to work with ...
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0answers
34 views

MPPT using pic16f877a (solar battery charger)

I'm trying to charge some batteries using 12v solar panels. I'm using a pic16f877a for the mppt algorithm(incremental conductance). I have two problems: 1)Current Sensing: I want to use acs712 (5A) ...
3
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1answer
51 views

Chaining buck converters

I am using these step-down adjustable buck regulators for various purposes (hobby projects and experiments) and they work more or less fine. But I have this little concern - when they convert ...
4
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1answer
109 views

What's an efficient way to get below the standard 1.25V on buck converters?

So, I purchased a buck converter which was advertised to be able to range down to 0.8V but, as you can probably guess, it only goes down to 1.25V which I understand is the reference voltage for the ...
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1answer
90 views

How do I wire an ebay AC-DC 12v Power Supply Buck Converter Step Down Module

I go a few of these from ebay, but they lacked any kind of instructions and it's not obvious from looking at the circuit-board markings which is the input and output (I guess maybe the holes marked ...
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1answer
29 views

synchronous buck converter with different MOSFETs

do you know if it is possible to use different type of MOSFETs in a syncronous buck converter for the hi-side and the low side switch? How does this improve the converter efficiency? Thank you
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1answer
59 views

SMPS buck convrter with PWM controller circuit

Hi there I am designing a buck converter run on PWM circuitry for a uni project to drive a MOSFET switch and keep my output voltage constant. The specs are: input voltage of 20v DC +/- 4 output ...
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1answer
42 views

Power supply - Boost voltage over distances

I'm looking for a good power supply design to boost the DC voltage and convert it to AC so it can be transported over a long distances with low loss. I have drawed a example picture: The only thing ...
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0answers
15 views

State space averaged model or switch averaged model?

While modelling the buck converter, which model best describes both CCM and DCM of operation? I'm trying to model in MATLAB for a CCM and DCM combined buck model. Can anyone help me with the best way ...
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1answer
60 views

Unwanted oscillations and distortions in buck converter

I've tried today to design a very simple and crude 26V to ~12V buck converter. But after testing it in LTspice I've got some weird and unexplained oscillations and distortions. The oscillations ...
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62 views

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 ...
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1answer
54 views

Two DC DC converter with different output - In series or parallel?

Source: LiPo Battery (13V - 16.8V) Consumer #1: 5V (RaspPi) ~1A Consumer #2: 12V (variouse) 0-3A (plus ~1A if series) DC/DC step down: two LM2596 Which would be the better solution: LM2596 #1 on ...
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1answer
87 views

How come SMPS regulators doesn't show current limiting circuit?

for example the LM2678-ADJ is a famous buck converter, there are also many others. I have googled and looked through other regulators, there are many schematics in the datasheets of how you make the ...
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2answers
65 views

How to control output voltage on a Buck Converter

I'm fairly new to electronics and I have copied the Buck Converter (LM2678) in the picture attached to convert 24V to 5V. After trying it I have actually converted 24V to 9V and my question is if I ...
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1answer
34 views

Synchronous Buck Converter loop function

I have been reading the data of this Buck converter model, but on the block diagram scheme. I don't understand what does the indicated feedback loop do. The buck Convert model is LM5165-Q1 and this ...
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2answers
55 views

TI TPS57160-Q1 step-down converter outputs sawtooth-like voltage at high input voltages

Disclaimer: I have posted this question on Texas Instruments' E2E Community before (Here), but haven't found a solution to my problem yet. In the meantime, I haven't found any way to progress on this ...
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1answer
39 views

Does current flow through the potentiometers of buck and boost converters?

I'm working on a project where I'm replacing the trimpots on a buck converter and a boost converter with proper potentiometers. The new potentiometers will be wired to the converters instead of ...
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2answers
27 views

Current drawn from source by buck reg

simulate this circuit – Schematic created using CircuitLab The circuit above is that of a buck regulator that has an efficiency of approx 85%. The input and output voltages are 10V and ...
3
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1answer
65 views

Effect of using two buck converters in series

Are there any limitations of connecting two non-isolated buck converters in series? Just taking the output from the first converter and connect it as the input of a second converter to produce two DC ...
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1answer
51 views

LMR10510 - Simple switcher “breakoutboard” output measures 0V

I have a problem concerning this Simple Switcher found here. I used the design example 3 for the LMR10510Y found on page 17 of the datasheet, however measuring the output pins of the switcher returns ...
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1answer
49 views

buck regulator MOSFET turning off for a short duratiopn

I am designing a regulator system using a buck regulalator. The datasheet is - datasheet. Now, the regulator can be configured to switch at 100-500kHz, and this is done using a resistor connected to ...
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2answers
346 views

What is the correct replacement for this mosfet?

I'm trying to repair a broken DC-ATX power supply that I have. After a bit of searching for faults I believe I have tracked the problem down to one of the MOSFETs. I would like to try replace this ...
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2answers
85 views

Isolated AC/DC Buck Converter

Why are there no isolated AC/DC buck converters around? For applications < 10W (say 5V/1A output) and mains input (85 - 264VC), is it feasible to use a standard buck circuit but add a 1:1 ...
4
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1answer
196 views

SMPS Buck converter with PWM circuit

I am designing a buck converter with PWM circuitry for a school project to drive a MOSFET switch to keep my output voltage constant. The specs are: input voltage of 20v DC +/- 4 output voltage of 5v ...
0
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1answer
54 views

Advice on Buck-Boost Stage

In one of my circuit, the incoming variable voltage(8.5-24V DC) from the source will be first stepped up to 17V using a boost converter. The same output shall then be stepped down to different ...
4
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1answer
99 views

Loop compensation design of buck converter

I am trying to design loop compensation with type-3 error amplifier for a buck converter. I'm a student and very inexperienced in this subject. Please bear with me. Here is the general procedure ...
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0answers
29 views

Determine correct frequency for existing buck converter

This piece of equipment landed in my lap. It is a South African made solar MPPT charge controller. It consists of a controller board with an ATmega88 chip that drives 4 synchronous buck converter ...
0
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1answer
34 views

LM3405 (buck driver) dropout

I've built an LM3405 LED Driver, which works (seem) well. The LED have a 3.2V of Vf and works at 700mA. The regulator uses an external boost voltage of 3V (from an LDO). Reading the datasheet of the ...
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2answers
48 views

Simple PWM vs Buck Topology for Motor Speed Control

A simple triangle wave generator with a comparator can be used to create PWM that can be fed to a switch for controlling the speed of the motor. Alternatively, by using any buck controller ...
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3answers
128 views

Transformerless BUCK SMPS for 1kV->12V

I have a challenge to push 500 Watts (15V) at 100 meters of telco telephone cable (0.088mm2, 28 AWG, 200Ohm/km, 500MOhm insulation). The only way to achieve this is by boosting the voltage up to ...
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4answers
445 views

Is Stepping Down More Efficient When Voltages are Already Closer Together?

If I was to use a buck converter to step-down my input voltage would I have a greater efficiency if my voltages are close together e.g. 7.2v to 5v compared to 12v to 5v?
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3answers
110 views

Buck-Boost converter question

I have a school task for creating a Buck Boost converter that takes 12V and outputs -48V. I have done some digging and couldn't find my answer since I could only find converters that give a number ...
0
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1answer
55 views

What's going to be more efficient, buck from series or boost from parallel?

I've found many similar questions, and hate to ask something so similar, but my goal is to get usb power (4A continuous) from 4 18650 Li-Ion cells. I'm debating putting them in parallel and using a ...
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3answers
49 views

Definition of terms for a Synchronous Current-mode Buck Regulator?

I was reading the datasheet of MP1482 chip which is buck regulator, I have read some of terms in the datasheet I did not understand could any one explain it in simple world. The MP1482 is a ...
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1answer
80 views

LT3845 SHDN pin behaviour

I am understanding the working of a buck regulator LT3845 from linear tech. The datasheet is - here. My doubt pertains to the SHDN pin on the IC. The SHDN pin is connected to the Vcc via a voltage ...
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3answers
94 views

Dead time in Synchronous Buck converter

During dead time of any DC-DC converter both the switches are turned off to avoid any shoot-through current. But in a synchronous Buck converter that would mean sudden zero current through inductor. ...
3
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2answers
115 views

How dead time happens in boost converter?

I understand that in a buck converter dead time happens as both switches are ON simultaneously and this short the power supply. However, I don't see how dead time can exist in boost converter. Could ...
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2answers
105 views

Bootstrap capacitor

I am new to electronics could any one explain to me what is the Bootstrap capacitor and what is used for I am doing research about buck convertor using MP1482 chip and I do not understand bootstrap ...
2
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1answer
96 views

Unexpected LTSPICE Output - Voltage Mode Buck Convertor

I'm trying to simulate in LTSPICE a simple buck convertor taking 34V -> 20V @ 2.5A and I'm not seeing what I expect. Here is my circuit and some waveforms: The top half of the circuit is the ...
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2answers
42 views

Switcher discontinuous mode - potential EMI problem

I need to design switching mode power supply with input voltage range of 25V-45V and output voltage 5V@2A. Power supply must be ON while the system is in sleep mode(~1mA consumption). In that ...
4
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2answers
104 views

Advice and critical remarks regarding the manufacturing of a DC-DC step-down converter

I'm in the third year of my electrical engineering major and I want to take things a bit further than the usual analogue electronic circuits I've studied thus far by making a DC-DC step down converter ...