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

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2answers
42 views

Layout of doubled SW pin on buck converter IC

I'm working on a PCB for the MP2617. That IC integrates a buck converter and has two physical SW pins sandwiching the VIN pin, as shown in my tentative layout below. No other pins on the IC are ...
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3answers
69 views

PCB layout of buck converter: capacitor placement

I'm designing a PCB for an IC that includes a DC/DC buck converter (MP2617). This is my first PCB, so I've been using the following resources for the layout: 1 and 2 (PDF files, the first one is a ...
3
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0answers
34 views

Increasing 12V Rail current on power supply for mobile computing

I am building a miro-itx slimline pc for my mobile home that is powered by solar. I have selected a GPU with a rated TDP of 120 Watts and a CPU with a TDP of 53 Watts.I purchased a DC-DC buck ...
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1answer
26 views

What kind of driver should I implement in buck convertors

I have a couple of questions. In the diagram below, when the current falls to 0 , the NMOS is supposed to turn off. Similarly when the voltage error increase the PMOS turns off. However in the diagram ...
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1answer
44 views

Effect of load changes on buck converter

I know to some extent that the control block monitors the output and adjusts the duty cycle accordingly and the output changes with change in loading (that's why the control block is used in the first ...
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1answer
30 views

QFN VS MSOP- Which is better for thermal performance

I am having to decide between a MSOP package and a QFN package for a Buck controller that I am designing in. The Part number is LTC3603. The MSOP is called an eMSOP. I cant locate any further ...
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0answers
20 views

wireless charger coil/buck converter issues

I have a wireless charging receiver coil (output 5.6 v, 1 amp) connected to a variable buck converter. When I connect the wires, I get no output reading from the buck converter and the voltage on the ...
0
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1answer
52 views

Buck converter charge battery control output voltage

I have a buck converter charging 8 series of Li-Ion batteries ( 8 x 4.2 voltage of charging) with a source of 36 V. I am using this schematic (from here): I know that for a resistive load, the ...
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1answer
55 views

Lift the FB pin of buck regulator [closed]

I have a basic buck regulator with feedback control. \ If I open feedback pin of the regulator (example lift the FB pin), then the regulator will be damaged. Why ? Regards, Azlum
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3answers
80 views

Resistor instead of Inductor in buck regulator [closed]

In buck circuit, If I mount 0E resistor instead of inductor then what will be the problem ? And what is the use of inductor in buck regulator ? whether just for filtering ? Regards, Azlum
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1answer
30 views

Feedback in hybrid power supply

During my research of PSU I came across schematic from Linear's datasheet: 1) Whats the purpose of node which is going from output to SW pin of buck converter? 2) Is node which provides 6V ...
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0answers
79 views

problems faced in buck-boost bi-directional converter with supercapacitor

i'm making a buck-boost converter. it should have an input voltage of 75 v and produce an output of 400v when in boost mode. The 75 v is to be supplied using a supercapacitor. The mosfet used is ...
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0answers
56 views

Regulator design for negative voltage O/P

In my application, I am generating 7.5V from TPS5430 (Buck) regulator and to generate -5V, I am assigning inductor's one leg to input of 7905 for -5V o/p. Circuit is shown. U14 is TPS5430 and U15 is ...
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1answer
92 views

Buck converter Mosfet gate driver

How to turn on a buck transistor via a bootstrap circuit? In my circuit, I use a AVR microcontroller to turn on and off a buck switch. What circuit should I use here? Previously, I used optocoupler ...
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2answers
56 views

Peer Review of Buck Converter

The only limitations I can think of are: Comparator/Schmitt not gate output swing time, and Transistor switching time simulate this circuit – Schematic created using CircuitLab BTW, ...
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2answers
74 views

Help with MOSFET buck converter

I've started learning about Buck Converters, and I made a miniature one on an Arduino prototype shield. But when I turn the thing on, the voltage is stuck at 5v (the voltage input). I tried ...
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2answers
99 views

Available synchronous buck converter chips are bidirectional (current)?

I was going through available synchronous buck converter ICs with external PWM capability (which can be controlled with the help of a micro-controller) and i found this one for e.g. I have read in a ...
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0answers
67 views

Controlled supercapacitor charging with buck converter

I'm building a charging circuit for two supercaps (2.7V, 3000F each) in series. I've got a 12V supply and a buck converter rated to 15A, which I've set to provide 4.8V. I'm using balance resistors to ...
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2answers
96 views

Is there a DC-DC converter topology that can output positive and negative?

E.g. Is there a converter topology that can take a 12v input and convert it to -12 to +12v output with respect to GND? For the record I'd really prefer something that doesn't use rare magnetics. I ...
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2answers
863 views

Is it better to boost or buck?

I'm making a solder fume extractor from an old PC fan (4-pin PWM), driven by a mid-range PIC. The fan needs 12V @ max 0.28A for power and a 5V PWM @ max 5mA to control the RPM. So I'll be running the ...
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1answer
84 views

Buck converter controlled by a BJT based astable multi-vibrator with zener-based feedback?

simulate this circuit – Schematic created using CircuitLab This is my rough sketch for a buck converter controlled by a BJT based astable multi-vibrator with zener-based feedback. Before ...
0
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1answer
28 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 ...
0
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3answers
55 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
130 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
45 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 ...
1
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1answer
110 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
55 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 ...
0
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0answers
48 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
28 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
52 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
55 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
174 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 ...
2
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2answers
286 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
99 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
19 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 ...
-1
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1answer
82 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
23 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
67 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 ...
0
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0answers
71 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 ...
-1
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2answers
104 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 ...
0
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1answer
79 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 ...
0
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2answers
305 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
31 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?
0
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1answer
117 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 ...
0
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1answer
91 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 ...
0
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1answer
96 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
53 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
94 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 ...
0
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1answer
57 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
86 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 ...