Questions tagged [switching-regulator]

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

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43 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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54 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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54 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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79 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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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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77 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
35 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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54 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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39 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
35 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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30 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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39 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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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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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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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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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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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
27 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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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
48 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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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
51 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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48 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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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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249 views

LM2576-X library for Proteus

I'm using proteus 8.9 SP0. Is there any library for LM2576-X (x = 3.3, 5, 9, 12, 15)? I have LM2576-ADJ (adjustable) but I need fixed voltage series.
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95 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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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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6answers
585 views

Switching regulator using MCUs

One of the most useful ability of MCUs is generating PWM signal. For example ESP32 duty resolution can be lowered down to 1 bit in which case the maximum frequency is 40 MHz. With such fast clock ...
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1answer
112 views

Swapping of Desktop Voltage Supply with Wireless Charging Module Results in Unexpected Voltage Differences and High Current Draw

I'm trying to power my circuit via a wireless coil module and have a working circuit using a desktop voltage supply at the same voltage (12V). Simply by swapping out the desktop voltage supply with ...
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2answers
51 views

Separating power depending on voltage

I just started working on a computer science project that requires me to do some hardware stuff, but I am a complete noob most of it. For a part of the project I need to be able to forward a current ...
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2answers
85 views

Choosing the right capacitors for LM2596

Picture above is from LM2596 datasheet. Is the recommended values is for fixed output voltages? If yes how to choose right capacitor value for variable output? What's the role of Iload in choosing ...
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1answer
44 views

Boost converter output power issue

I have LT1302CN8-5#PBF, fixed 5V DC/DC boost converter. I have built the same circuit as shown in the following datasheet document. (https://www.analog.com/media/en/technical-documentation/data-...
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120 views

Controlling LM2596 digitally

Below schematic is how I'm going to control the output of LM2596: simulate this circuit – Schematic created using CircuitLab I want the output of the LM2596 to be 3-15V and it does exactly ...
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175 views

Confusion about GND and PGND

In a digital circuit like a cell phone. If a switching ic has it’s reference point as PGND, separate from the main GND (4v Main vcc coming from battery), but they’re tied together, then What exactly ...
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1answer
46 views

Controling switching regulator digitally

I found this -piece- of schematic which is for controlling LM2596 output with a MCU, and I'm a bit confused: What is the purpose of those two schottky diodes? isn't it causing voltage drop which we ...
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52 views

Selection of Frequency in Switching Regulator

The AD ADP5070 for feeding a low noise amplifier and a 24 bit ADC, can be regulated at two pin selectable frequencies: 1.2MHz or 2.4MHz, accepting an external oscillator in the range 1 MHz to 2.6MHz. ...
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53 views

LM2574-5.0 Voltage Drop by 1/2 v (2.5V) instead 5V

I have a problem with an LM2574-5.0 that only gives me half ( 2.5V instead 5V) the voltage needed when loaded. I looked for a circuit on the net with good filtering, because the circuit will be ...
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2answers
287 views

Combining switching and linear regulators

If we have a 12V DC input voltage and we drop that voltage using a switching regulator (LM2596) to 9V and then use a linear regulator (7805) to drop 9V to 5V, what is the output voltage going to look ...
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111 views

How can I layout these regulators to minimize board size and EMI?

I have three switching regulators. A 12V, 5V(green box), and 48V(purple box). The plan is to supply both regulators through -/+12vout pours. If I am trying to minimize board size while also ...
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1answer
102 views

How to terminate unused transformer pins?

What is the correct way to terminate/wire these unused transformer pins? Do they get tied to GND?
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EP53F8QI Short to GND fault

We have a design with an EP53F8QI that multiple ICs have been burned both at room temperature and +80 °.C. We are using it to create a +3.3V and on fault we have found that the +3.3V supply is shorted ...
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115 views

What did I do wrong with this switching voltage regulator circuit (LM2574)?

I'm new to the electronics world. I've been trying to build a switching voltage regulator circuit using the LM2574N-5G (datasheet) IC. I'm trying to switch 9V (from a 9V battery) to around 5V. I've ...
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1answer
50 views

part number of switching regulator component

Can somebody help me to read this component part number? i think its switching regulator. thank you.
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1answer
41 views

Is it possible to use multiple LTM8049 in parallel?

Is it possible to use multiple LTM8049 Dual SEPIC or Inverting μModule DC/DC Converters in parallel in order to further reduce noise, increase output current, and spread heat on the PCB? It is ...
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3answers
224 views

Buck Converter dies unpredictably upon connecting power

I made a PCB for an ESP32-based solenoid controller that is powered by a 24V DC Jack. I'm using an AP63205 Buck Converter to step that input down to 5V DC, and then a linear 3V3 LDO to power the ESP32....
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Does supply voltage affects stepper motor driver heat dissipation?

Below is a block diagram of a stepper motor controller with an external mosfet h-bridge that drives one of the stepper's coils. Let's say that the coil has 2ohm DC resistance and 3mh inductance, the ...
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84 views

Calculating Junction Temp of Switching Regulator

I was looking at TI web bench to find a regulator, my question is my calculation is correct and if it is why we have different value on webbench. The IC is TPS565208 P = (Vout - Vin)*Iout => (12-...
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114 views

Choose regulator for 12V to 5V with 3Amp [closed]

I need help on choosing type of regulator base below design requirements Design Spec: Input Voltage = 12V Output Voltage = 5V max Current = 3A Power (12-5)*3 = 21W EX: Without heat sink 60C/W (...
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1answer
135 views

Massive pk-pk ripple on output using isolated DC-DC converter module

I'm having a very odd issue using an integrated DC-DC isolated converter module. As the module stabilizes, a massive pk-pk ripple is developing on both the output and the input. At first we thought ...
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50 views

Effect of switched regulator drop out

I am designing a multi-voltage (3, 9, 12, and 15) power supply fed with a 18VAC transformer, about 24.5 peak DC source. With the toughest requirements, output 15V at 5A, the 6600uf filter capacitors ...

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