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

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3
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1answer
48 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
105 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 ...
0
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1answer
59 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 ...
0
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1answer
22 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
42 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 ...
0
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1answer
39 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 ...
-4
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0answers
41 views

My buck converter is not giving increased output current? [closed]

I have used the following values- vin = 10V through a DC supply; f = 1MHz through an oscilloscope; Cin = 2.2mF; Cout = 10mF; L = 60uH; MOSFET IRF540N;Schottkey diode IN4001 used as flyback diode. ...
0
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0answers
10 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 ...
0
votes
1answer
33 views

Equivalent of LTC3780 in Texas Instrument [closed]

Does anyone know of an equivalent for LTC3780? I have a design for LTC3780 that takes 9-20V input and gives an output of 12V/10A. It seems expensive so i'm looking for an exact pin to pin equivalent ...
1
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1answer
52 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 ...
1
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0answers
57 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 ...
0
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1answer
46 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 ...
1
vote
1answer
72 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 ...
0
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2answers
63 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 ...
-1
votes
1answer
31 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 ...
0
votes
2answers
51 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 ...
0
votes
1answer
34 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 ...
0
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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
votes
1answer
59 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 ...
1
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1answer
50 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 ...
0
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1answer
47 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 ...
1
vote
2answers
341 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 ...
0
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2answers
81 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
votes
1answer
162 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
49 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
votes
1answer
72 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 ...
0
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0answers
28 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 ...
0
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2answers
43 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 ...
1
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3answers
113 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 ...
5
votes
4answers
442 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?
3
votes
3answers
95 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
votes
1answer
52 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 ...
0
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3answers
48 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 ...
1
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1answer
72 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 ...
0
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3answers
73 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
votes
2answers
112 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 ...
0
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2answers
82 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
votes
1answer
73 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 ...
0
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0answers
66 views

Causes of power adapter failure

I'm dealing with a circuit which is powered with an external power adapter in 15V DC. The adapter is connected to mains at 220V. Maximum output power is 144W. While testing the circuit the power ...
1
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2answers
39 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
votes
2answers
100 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 ...
0
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2answers
61 views

Replace Li-Ion battery with buck converter?

I have a remote control for a GoPro camera. The remote runs off a 3.7 v li-ion battery. The remote draws about 100 mA. I want to extend its usability by supplying 12 v power. The camera cable takes ...
3
votes
2answers
70 views

Low cost 30A 24Vto12V stepdown converter [duplicate]

I'm trying to design a 24V to 12V step down converter. Power efficiency is not that important to me, but I want to come up with the cheapest solution possible. I don't need isolation neither. So I ...
1
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4answers
82 views

Measure indcutor ripple current in a SMPS

I need to measure the ripple current in a buck converter. In general, I add leads to the inductor and use a current probe. My issue now is that the inductor I am using has such a low inductance that ...
0
votes
0answers
60 views

Circuit components work individually but not together (buck converter and h bridge)

I need to regulate 15V to 12V to power a 12V motor. Additionally, I am using an h bridge so I can control the direction of the motor. Thus, our power path is 15V supply -> buck converter (12V out) ...
8
votes
4answers
740 views

Remove audible noise generated by buck converter

I'm dealing with a buck converter using an ISP452, an inductor and a capacitor to act as a buck converter driven by a PWM signal coming from a microcontroller. Some part of the circuit is producing a ...
0
votes
2answers
69 views

Vout = 12V, Iout= 15A, 180 W Switching regulator [closed]

I have experience of designing DC-DC converter upto 5A. But now for one of my application, I need to design circuit with following specs: Vin = 24 - 25 V, Vout = 12V, Iout = 15A, Pout = 180W So, ...
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1answer
96 views

what is this error in PSPICE with IR2113 [closed]

I want drive a buck converter with bootstrap technique. but this circuit does not work!
1
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2answers
62 views

Supercapacitor Voltage Draw

If I am charging a super capacitor with buck converter, that is a 1 amp, 1-18 volt output, and the capacitor is rated for 2.5 volts, how do I stop the buck converter from feeding it more than 2.5 ...