Questions tagged [switching-regulator]

It's a type of voltage regulators that rapidly switch a series device on and off.

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1answer
552 views

Connecting two DC sources in parallel using diodes

In the following circuit two DC sources with different voltage and current are connected in parallel using diodes. Can I assume that the load works fine if either of the source is available (S1 or S2) ...
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2answers
50 views

DC-DC buck converter low input voltage behavior

I am using this DC-DC buck converter. Schematics : Buck Converter Specifications : Input Voltage - 18V to 32V Switching Frequency - 300kHz Output Voltage 9V Load Current - 0mA to 200mA Maximum. I ...
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1answer
40 views

Buck converter input voltage lower than the designed output voltage

I have this buck converter which is designed to produce an output voltage of 9V for an input range of 18V-36V. The datasheet of the buck converter mentions that the minimum required input voltage is 4....
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42 views

Switch regulator driven by a super capacitor

I am trying to design a Power Management circuit with some quite tricky (for me at least) requirements. Basically I have a quite high 30-40V (varies) input voltage, with a very low current limit (6mA ...
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1answer
108 views

Why is my buck regulator based on LM22679 limiting current way under the set limit?

I have a LM22679-ADJ based buck converter. The output voltage is set to 24V. The input voltage may vary from 28-40V DC. The current limit is set to above 5A according to the graph given in the ...
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1answer
28 views

Analysis of switching regulator input

What I want to do, re my question of a time shifted resistor, is to analyze the input of a switching regulator consisting of the input capacitor with its ESR and the inductance of the trace maybe with ...
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2answers
119 views

What about variable frequency switching power supplies?

Maybe this question is perhaps too broad for the site: however, after looking on Google, searching the literature and asked to a friend who's a specialist in the design of SMPS without getting any ...
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1answer
48 views

Designing power supply on two sides of the PCB

I am beginner in PCB design. I have a reverse voltage regulator LT8365 generating -50V from 24V input, only this design exist on the topside of the PCB(2 layer) and I wanted to add another one(same ...
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1answer
98 views

How to prevent buck regulator chip from blowing up when using near maximum input voltage?

I need to step down 24V to 5V in one of my projects, so I used TPS54302DDCR (has a maximum input voltage of 28V) by TI and designed the circuit according to its datasheet and example schematic. ...
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2answers
91 views

High power (up to 400W) LED DC/DC power supply design considerations

I am designing a power supply for a high power COB LED requiring 360W @ ~75V from a variable ~60-80V DC input. I have noticed that it is difficult to find switching controller ICs that advertise being ...
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0answers
44 views

MC34063 Step Up regulator output voltage too high

I have a wall wart which is rated for 12V-2A, but I noticed that the voltage drops to 9V when I put a load of 500mA. To get a steady 12V on output I am trying to build a regulator using MC34063. I am ...
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2answers
33 views

Some help interpreting formula variables in Texas Instruments TPS565201 Buck regulator datasheet

I am working on a custom PCB for a robotics project, and so far it is going well. I already learned how to work with 3.3v/5v LDO voltage regulators, but now I need a high current 6V DC solution for ...
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4answers
82 views

A “Voltage Backdrive” on DC-DC Converters?

Below is a circuit I'm making. A 24 VDC PSU (VCC) goes through this switching regulator and outputs 5V to power the load. However, the load can also be powered directly by the USB 5V (USBVCC). Now if ...
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1answer
45 views

Powering 600 WS2811 5V LEDs by using larger voltage power supply and DC:DC convertors close to the LEDs

I am working on designing a device that will have about 600 WS2811 5V LEDs on it. I am trying to figure out a way to power all these LEDs. At about 60mA max per led this is about 36 amps of power ...
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83 views

Buck Converter Switching Pin and Voltage Output

By using rohm's BD9G341AEFJ-LB buck switching regulator, we want to take 5V. In datasheet BD9G341AEFJ-LB's datasheet the example circuit given like But we had to try circuit that is in Image-2, ...
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2answers
40 views

Switching regulator overheating

I am using LM2576T as a regulator in my design. I made a circuit by the datasheet, but I haven't connected the diode (I haven't got any at the moment). Could it be a reason for switching regulator to ...
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1answer
66 views

Why is my TPS62162DSGT regulator burning?

I need a 12V and 3.3V power supply for a circuit, so I designed a regulator onto a board to turn the 12V to 3.3V. I used the TI TPS62162DSGT to do this, and my schematic looks like: I used the ...
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1answer
52 views

Turn off MOSFET with diode - PWM controller Maximal output current

Here is my circuit (and I know that this circuit does not cause any problems at least for the moment): For turning on, the maximal current from the pin "OUT" is limited by the resistance ...
2
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1answer
35 views

Should I avoid a switching frequency close to my target SPI or CAN frequency?

I have a kind of an open-ended question. If I'm designing a board with a buck converter and have picked out my peripherals, and say for example I want to run my CAN FD interface at 1MHz baud and maybe ...
2
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1answer
65 views

Looking for feedback on switching power supply board design

I'm currently designing a PCB for my first switching power supply using the LM2576, I've discovered while prototyping that these kinds of circuits are pretty sensitive to layout, rogue inductances and ...
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1answer
45 views

How to prevent switching direct and/or inductive noise on a PCB?

I'm designing a power source for one of my projects and I couldn't find a better way to reduce the voltage drop on 7805 regulator other than using a switching regulator (LM2596). The switching ...
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2answers
108 views

What is wrong with my buck regulator circuit using the RY8310 IC?

A component in a larger circuit I've designed is a step-down regulator circuit. It provides an output voltage of 18V from an input of up to 29V. For no other reason than the PCB manufacturer had it ...
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2answers
84 views

Voltage Mode Control

Since i started my training about design of DCDC I'm really confuse with control part. At school i learned that DutyDycle=Vout/Vin for Buck, and that's it. But now, i see that, Duty cycle is set ...
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3answers
44 views

Choosing a large, reliable input capacitor for switching regulator

A project I am designing has to be reliable for many years. I have a switching power supply using a LM2596S-5.0/TR I am having trouble deciding on the capacitors. I have placed a tantalum 10v 220 uF ...
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0answers
47 views

How to split high current low voltage? Voltage regulators , current regulators(?)

I am using a 20v dc laptop charger that supplies 4 amps. I need 5v dc 4 amps. When I use a linear voltage regulator it’s too much current to pass through safely.. 15 amps change and 4 amps, so I use a ...
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1answer
80 views

Current Sense Amplifier Potentials

I'm trying to implement a current sense amplifier in my application, but I have a question about setting it up with regards to current flow. Basically, in this case, you put a very small shunt ...
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2answers
67 views

Distributing the output capacitance of a buck regulator

Buck regulators often specify the value and placement of the output capacitor. Typically 10µF placed very close to the buck regulator. However, what would the effect be of replacing the 10µF output ...
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2answers
121 views

LM2678 Switching Regulator Voltage Dropout Under Load and extreme Input Distortion

I recently had a question about the layout for an LM2678-ADJ switching regulator. Since, I have built the circuit and layout as follows: So far, I have only had moderate success with the circuit. ...
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0answers
42 views

Op-amp power supply driver problem (multisim), LM2679 simple switcher

The simulation works OK when I run with ideal op-amp but the problem comes whenever I change the op-amp to a real one (LMH6642MF) and that results in a converge error and a warning. I have tried to ...
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1answer
96 views

LM2678 PCB Layout question / review

After my initial question about switching regulators I had decided on trying to use an LM2678 for an adjustable/variable voltage form 5-24V and 5A max with an input of ~30VDC. The application will be ...
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1answer
37 views

Advice/Help choosing a proper (switching) voltage regulator

I am trying to wet my feet with switching regulators. Please note I am not an expert on electronics. Currently, I wish to have an adjustable supply of about 3 - 25 Volts, 5A available across the ...
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1answer
84 views

How to test an ACS line switch

I have SMD AC line switch (ACS1207S) on my washing machine electrical board. I need to check if it is faulty, what's the appropriate test?
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1answer
94 views

Identifying an IC, LNK364PN

The other night the corner of a switcher IC in a LED lamp power adapter blew off. I opened the adapter and "reassembled" the IC case with tweezers to identify the model. I see it's a LNK364PN and I ...
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1answer
42 views

Understanding the application of a switching regulator as a constant current LED driver

There is an application note from ON-semiconductors which provides a few diagrams to use a well known MC34063 switching regulator as LED driver. it's around the idea of setting the 1.25v feedback ...
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1answer
34 views

Mini flashlight working principle

I am sorry if this is inappropriate question, but this little flashlight spiked my curiosity. Sadly I wasn't able to understand it by myself. Why there is a inductor in there? What allows it to have ...
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1answer
51 views

DC current at input and ouput capacitance of buck

I'm working on this website http://www.onmyphd.com/?p=voltage.regulators.buck.step.down.converter Could someone help me to understand those two statements: 1) "since the DC current of the inductor ...
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2answers
70 views

4-20mA to switching output

I have a 4-20mA output. I need to turn an LED on when let's say 20mA is reached. I can obviously do this easily with a plc or an Arduino, but I need to do it as cheaply as possible. Is there a simpler ...
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2answers
66 views

12 V to 5 V with highest current possible

I have a 12 V, 14 A DC power source and I would like to step it down to 5 V DC with the least amount of loss of current. Theoretically, by stepping down to 5 V is should be able to get as much as 33 ...
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0answers
40 views

Why does the MC34063 application note show different Vf and Vsat?

On Semiconductor application note AN920/D, on page 6 in the Step−Down Switching Regulator Design Example, uses a Vf=0.8V for the external diode: $$ \frac {t_{on}} {t_{off}} = \frac {5.0 + 0.8}{21.6 -...
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0answers
43 views

Why would a switching voltage regulator circuit produce fluctuating voltage output?

I've created a circuit (image below) Using the LTC3623EUUD#TRPBF. The output should be 5v, however the voltage is oscillating up and down. What would be causing the oscillation? I used solder paste ...
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0answers
67 views

MAX1771 not boosting voltage

I have made the below circuit using the MAX1771, but it does not work as intended. There is no increase in voltage at the output. It just outputs VIN minus diode drop at “CDI_TEST_HV”, as expected if ...
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1answer
28 views

Input decap in switching regulators

In a buck converter, is there any correlation between switching transition time and decoupling capacitor requirement? As per the TI document attached input decap values are only determined by input ...
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9answers
11k views

arduino power problem when using boost converter

I am making a bot capable of solving a maze. I will explain the setup first. There is a 18650 3.7V battery, using a XL6009 DC-DC boost switching regulator, like this one: Picture Source I boost the ...
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1answer
49 views

Non inverting DC-DC converter that makes fix 4V from a decreasing voltage from 4,2V to 2,8V? [closed]

Is it possible to make a a non inverting DC-DC converter that makes a fix 4V from a Li-ion battery's voltage. I need about 1,5A. The input voltage starts from 4,2V and decreasing to 2,8V as the ...
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0answers
40 views

Switching Mode Supply providing half of AC current

For my senior design project, I'm part of a team tasked with coming up with a driver circuit to drive a constant sinusoidal current having a peak of 1.5A through a coil for a range of frequencies from ...
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2answers
65 views

Input Capacitance in LM 2596 Step Down voltage regulator

What is the significance of the input capacitance (680 uF) (uF = microFarad) at the input of the LM 2596 ? LM 2596 is step down voltage regulator. Please refer: http://www.ti.com/lit/ds/symlink/...
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2answers
67 views

Using Buck converter and LDO from the same power source

I'm designing a device with several ICs and they require so many different input supply voltages. 18V, 12V, 3.3V, 1.8V 1.3V. 18V will probably use around 80W out of 100W(20V, 5A) main supply budget ...
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2answers
29 views

Is a Synchronous Step-Down Converter powered from industrial 24v a good choice to power a 3.3 volt MCU and sensor ic?

I am building a sensor that will be powered from a 24v industrial power supply. The board will contain a 3.3 Volt MCU and sensor IC. Is it a good idea to use a synchronous step-down converter and just ...
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1answer
104 views

PFC controller - How does it work?

I would like to better understand how a PFC controller works, especially PFC which work in CCM mode. I found the following documentation from International Rectifier: https://www.infineon.com/dgdl/an-...
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0answers
55 views

Considering the inductor in a buck DC-DC converter, how to compute the current through it?

I've been stuck for a few days to the very first point of a lab in which we analyse the behaviour of buck and boost converters. The circuit is built by the university I study in, so there is no acutal ...

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