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

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2answers
43 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
58 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
52 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
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0answers
54 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
637 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
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2answers
58 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
61 views

what is this error in PSPICE with IR2113

I want drive a buck converter with bootstrap technique. but this circuit does not work!
1
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2answers
55 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 ...
1
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3answers
71 views

How to use the power good signal properly?

I'm powering a circuit from a buck converter. I've seen that many buck/boost converters (for example, TPS62177) have a PG or power good output signal which ...
0
votes
1answer
63 views

Need help choosing options for 12V supply from a Lithium-Ion battery

There are lots of Class D audio amplifier modules for 12V use that are both readily available and inexpensive, intended for automotive use (hence the 12V rating). I would like to use one of these, ...
0
votes
2answers
57 views

Buck converter as a LED driver with NO LOAD

I am proceeding with a design of a LED driver using an LM3405. I don't read anything related to what happens when the load is not present, on the datasheet. As you may have already read, this is the ...
0
votes
1answer
30 views

output filter capacitor of a buck regulator behaves as an inductor at the switching frequency. Will the ripples get filtered out?

I'm using LTC3533 buck-boost regulator. The output capacitor is 100uF ceramic based. After checking the manufacturer's datasheet ,it turns out that at the switching frequency( 1MHz) the capacitor ...
1
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1answer
47 views

Buck controller MOSFET drive voltage

I am trying to design a switching regulator for LEDs, which uses the LM3405 as controller. This IC uses the BOOST pin to power the internal MOSFET driver, which controls an internal MOSFET. There are ...
0
votes
1answer
71 views

Buck converter with an IR2110

I'm making a buck converter with the following characteristics: Input voltage: 24V Output voltage: 5V-20V Max current: 5A *Constrains: The transistor driver must be an IR2110 I have the ...
1
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2answers
49 views

Current step to LC circuit

An inductor is a device which adjusts its voltage to keep the same current flowing through. However, the current exponentially decays when there is no source any more. Similarly, a capacitor is a ...
0
votes
1answer
36 views

digital controller design and mapping analog signal to digital integer values

I have a specific situation i am trying to wrap my head around but i think it should have a general formalism to address the problem. I have designed a BiQuad controller for a buck converter and i ...
1
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2answers
66 views

Is this a viable mini wind turbine setup?

I'm going to build my first wind turbine. I have already constructed the prop, 5 blades 50cm long from PVC pipes. I've searched for a decent sized motor and charge controller. The turbine will be ...
1
vote
3answers
58 views

Core loss appearing in buck converter ripple current

I have been told (and have also seen experimentally) that an inductor with a high core loss will introduce "glitches" to the ripple current in a switch mode power supply. I have tried researching ...
1
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1answer
65 views

Voltage Mode Control of a DC-DC Buck converter

My previous question was about a hysteretic-style buck converter: Buck Converter Control Scheme- Why isn't just a comparator not enough? By what I gather from previous answers, a ...
0
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4answers
100 views

Can I use a DC-DC buck converter with an arduino

I'm just starting out with electronics and arduinos, but I want to ask if i'll be safe using an LM2596S DC-DC step down buck converter as the regulator for my arduino project? I have a few to hand ...
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2answers
46 views

Datasheet for the AX2003SA buck driver?

I've got an electronic board with a blown Ax2003SA (1252 edition) on it. This chip seems to be chinese, and I cannot find a datasheet on it. Is there a datasheet for it? here is a picture of the ...
5
votes
3answers
563 views

Do buck converters increase the amp hours of a battery?

I've read that they are 90% efficient compared to linear regulators so given the relationship between volts and amps and I want to power the project off of a 12v battery that has 18Ah and is charged ...
0
votes
0answers
31 views

chokes in dc power lines and differential lines

I am trying to understand the concepts of EMC/EMI filtering. I understand that this a very vast subject and my question could be a bit vague. I am trying to design a power supply board having a dc-dc ...
1
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4answers
76 views

LT3845 not giving 1.3V

I am using the LT3845 to obtain 1.3V of output. From the formula given for calculating the resistors to obtain 1.3V, I conclude that R5(the one tapping into the Vout) should be approx5.69Ohms and the ...
0
votes
1answer
26 views

buck regulator Vout configuration

I am using the LT3845 buck regulator to step down a voltage from 9 to approx 1.2V.Now, I see that the formula for configuring the Vout is as stated below - This means I cannot go below 1.231 as ...
1
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1answer
59 views

What would happen if you connect a solar panel to a buck-boost converter?

What would happen if you connect a solar panel with the following characteristics: Max Power:3.5W Voltage: 6V Open Voltage: 7.2V To a buck-boost converter that convert an input voltage in the ...
1
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1answer
85 views

Buck boost converter - High current 15A@12VDC +

I don't have much experiences from designing and understanding more complex circuits. I only have basic knowledge how different components work and how to create and calculate simple transistor ...
0
votes
1answer
81 views

Need circuit for 12 volt 2 Amp step down power supply from 18 volt 1.5 Amp Input

I have a power supply which outputs 18v 1.5 amp. For the purpose of my project, I need a 12v 2 amp power supply. I was wondering, if I can make a simple buck converter to convert 18v 1.5amp DC to 12v ...
0
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2answers
54 views

BUCK converter considerations in a battery charger,with battery as a load

What are the essential considerations of a BUCK converter with a battery(lead-acid) as a load? Here are some basic questions which i need some clarification: 1.Is it better to use a synchronous ...
0
votes
1answer
48 views

Self resonant frequency of buck converter

I know that one can calculate the self-resonant frequency for an LC filter of a simple buck converter(having one inductor and one capacitor at the output) by the formula 0.5*pi*sqrt(LC). My question ...
0
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0answers
42 views

Filter Capacitors for Buck convertor

Normal buck convertor has input and output filter caps. Other articles on this site and elsewhere give good guidelines for the sizing of these components. Normally the input filter cap is connected ...
1
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2answers
188 views

Built a power supply but output isn't smooth enough?

I built an ac to dc power supply using the lm2576t. I have a full wave rectifier and a filtering capactor going into the lm2576t. The configuration I used for the lm2576t is the one on the first page. ...
1
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1answer
57 views

common mode chokes and their selection

I am trying to select common mode chokes for a board that I am designing. The point of doubt is common mode and differential mode noise filtering and the parameters/values of the components selected. ...
0
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2answers
53 views

Buck regulator frequency

I am trying to use a buck regulator. Usually I make it use at its Max frequency and then just use it. But now, we want to go for Emi and emc certification. I am hence told that this switching (a few ...
2
votes
1answer
75 views

Extending battery life: Calculating advantage of adding more batteries

I have a small 3 volt device with an MCU and 8 LEDs that I'm currently powering by two AAA batteries connected in series. With fresh batteries, I start out with about 3.2-3.3 volts and get very good ...
0
votes
0answers
86 views

CCM and DCM for buck/boost converters

I just want to clarify some concepts about CCM and DCM for converters. Am I right to say that Imin=0 is the boundary for it to conduct at CCM? So, if Imin<0, it will become DCM? Or is it when ...
0
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1answer
81 views

Power Supply for IC

I am thinking about utilizing a step-down regulator chip for a synchronous buck converter. I figured a basic laptop power supply would work for this (fit some connectors on it). I have done the ...
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2answers
112 views

Charging lead acid batteries using DC-DC Buck Converter

Is there any disadvantage using an 18V 2A transformer with an adjustable DC-DC buck converter(link below) to charge a 12v 7Ah battery ? I know that the charging current must not exceed C/10 (700mA ...
-1
votes
1answer
35 views

Synchronous Buck in possible DCM opeartion?

I'm currently testing a buck converter I designed but I was running into some issues with it. Vin = Solar Panel (30W, 17V at Vmax, 1.76A,Imax) Vout = 12V battery Inductor = 150uH (Switching ...
1
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0answers
52 views

Designing Buck Converter with Adjustable Output Current and Output Voltage

I am currently attempting to design a buck converter where both the output current and output voltage can be simultaneously adjusted. I will be utilizing an Arduino for control. I figured some sort of ...
1
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1answer
82 views

PI control Implementation for Buck Converter using Arduino

I am implementing current control on my synchronous buck converter using ARDUINO UNO. I designed my control via "Symmetrical Optimum" method and calculated the values for Kp and Ki (not Kd since i am ...
3
votes
1answer
88 views

Capacitor Powered Vehicle Project

I'm working on a project to design and build a 1/10th scaled ultra-capacitor powered electric car. I'm a Mechanical Engineer & I really want to focus on the the building and testing of the vehicle ...
1
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1answer
179 views

Inductor and noise due to buck regulator (high frequency)

This is a generic question on the selection of inductors in buck regulators. The selection of inductors is based on mainly the ripple current and the switching frequency parameters of the buck ...
3
votes
1answer
51 views

Buck converter simulation

I am having some troubles to simulate a Buck converter in LTSpice. I added a picture of my schematic in which a use an IGBT (IRGP20B120U-EP from International Rectifier) and a fast recovery diode ...
2
votes
2answers
60 views

Buck conveter calculations

I'have to build a buck conveter with the following requirements: $$\text{1) Input voltage (Uin): 12 Volt}$$ $$\text{2) Output voltage (Uout): 5 Volt}$$ $$\text{3) Voltage ripple (on the output) 0,1 ...
2
votes
1answer
52 views

What could cause a buck controller to regulate to half its set point?

I have had two buck converters (from different vendors) fail in very similar ways. The first was blamed on electrical over-stress (i.e. too high of a voltage was applied to a logic-level pin) - the ...
0
votes
0answers
66 views

LM2576 High Inrush current blowing out LAMP load

I am using below circuit with following specification. Input : 24V, 14.5A Output : 12V, 20W, 1.6A Lamp load But when I am switching on my converter and hence lamp, current drawn by LM2576 is from ...
0
votes
1answer
64 views

Buck not acting as designed

I have designed a synchronous buck converter to step down a 17.4V voltage source to 12V at the output. I have attached the schematic as shown. Problem: The Buck is not operating as expected at all. ...
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2answers
139 views

High side Driver Issues

I am currently developing a small low power (high switching) Buck converter and have run into a strange issue that I have never seen before and was looking for some insight into the issue. I am also ...
0
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3answers
177 views

Buck converters- No Load condition

How exactly do buck converters work under no load condition? The capacitor voltage will try to charge up to the peak input voltage, with no load connected across it to discharge. How to avoid this ...