Questions tagged [switching-regulator]

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

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26 views

Calculating standby power or power consumption for switched mode power supply

Hi I'm new to electronics and I'm trying to design a standby power circuit that doesn't consume power any higher than 0.05W, the power supply will be a non-isolated switching regulator 24V in 3.3V out ...
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35 views

Unexpected current draw at idle load with MIC28517 Buck switching regulator?

I've designed and fabbed a PCB with a design for the MIC28517 IC and at 62.5V Vin I get a current draw of 50mA of the IC and Inductor which do get warm(3W dissipated on the inductor and IC) I've ...
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26 views

Design problem with current mode boost converter with the PAM2423 comp?

I'm trying to a boost conveter PAM2423 which workd at 520kHz for the first time(using a high quality breadboard from jameco for prototyping) following the manufacturer ref schematic: My Setup: I've ...
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How can the output current be programmed in Step-Down Regulators?

I use analog device's LTC3649 regulator as step down regulators. It is said that there is a programmable output current in the datasheet, but I have no idea how to do this. Anyone have an idea or ...
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114 views

Why am I seeing voltage spikes on the output of an LM2596?

I have been working on building a DC/DC converter for an ESP32 using an LM2596. With a few prototypes out in the wild I'm seeing them reboot randomly. Having the circuit back on my desk with a scope I'...
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38 views

Switching regulator startup voltage and sag

I have designed my first voltage regulator circuit using LMR33630ADDA. When supplied with input while not loaded, it produces a very good 5V. If I have a load of ~20mA attached when input is applied, ...
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63 views

Using linear and switching regulators in parallel for servos and microcontroller

I'm just wanting to confirm that this circuit would be safe/reliable to implement. I'm hoping to run two servos - one 6V one 7.4V - in parallel with an ESP32 dev board with built-in linear regulator, ...
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48 views

What is affected by switching noise - do I need to care about it?

EDIT: Load side is build up like this : ESP > Shift Register/Expander > NMOS > SSR DC > 3 x Pumps (uses V_in or external power supply via SSR AC) ESP > Shift Register/Expander > NMOS ...
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31 views

setting up LDO with variable output current (+diagram)

After reading on regulators, and asking few questions here and there, I think I should change my circuit to the following scheme : These images are from datasheet of the LDO regulators (both ...
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30 views

MP1584EN Regulator

i found this schematic in Datasheet . what is 'C6' value Here ? What is Mean of 'NS' ? how Can i get 5.5 volt in output .
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46 views

Input transient voltage of a regulator

I am using a regulator in a design. The regulator gives 5V output with 9V to 60V input. The datasheet says that the input transient voltage is 80V/second. Does this mean the regulator can handle an ...
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36 views

Low-Standby Battery Power Button Circuit

I return with yet another power switch circuit for an entirely new project! (Yeah I do a lot of robot projects lol) So basically I designed a circuit to turn on/off a battery-operated device from the ...
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61 views

Does the body diode of the high side n-channel FET in a buck converter turn on during switch node voltage spike time?

A typical synchronous buck: The normal switch node spike that people typically see when the high side FET turns on: In the past i have been fairly negligible on this part. When the switch node spike ...
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66 views

Can LC filter at the input of the switching regulator cause problem?

The system I designed uses switching power supply Microchip MCP16311 for operation. The problem is that during Run test, which i let the board communicate with other system via Modbus, the ...
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how to determine max peak of switching regulator in frequency domain (radiated emission)

I want to know how do I determine what should be the switching regulator peak in frequency domain(Radiated emission) , and where should I measure (Output or on inductor , capacitor). Lets do below ...
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59 views

LM2576 vs modern step-down switching regulators - EMC requirements and other differences

I'm looking for some cost reduction in my design and I want to replace TPS54302 with LM2576 or LM2575. In my case - switching regulator works as a pre-regulator with 12-24V input and ~6V output, ...
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213 views

How to use USB 5V output for 3.3V webcam module

I want to use an old webcam module from a notebook which needs 3.3V. Therefore I want to solder it to a USB cable and use it at an USB port on my computer. For now I use the 3.3V source from a ...
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19 views

LTC3106 solar harvester over-voltage at output during recharge

I'm using an LTC3106 in the configuration of the attached schematic: It works fine from battery and from Vin inputs, delivering the expected 3,3 V at Vout. Problems arise when, with Vin present, the ...
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383 views

Why is it required to put an external inductor and diode at the output of a step-down switching voltage regulator?

I'm using a LM2576 switching voltage regulator and I see that an inductor and a Schottky diode are required at the output. The schematics is below: I understand why the capacitors are there, but why ...
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47 views

How does this compensation network work?

By accident I stumbled upon this Linear Technology application note (LT1074/LT1076 Design Manual): https://www.analog.com/media/en/technical-documentation/application-notes/an44fa.pdf Just for fun I ...
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43 views

RLC band stop vs. RC low pass filter for switching noise in DC-DC converter

I'm working with a DC-DC switching IC that has a fixed switching frequency of 10kHz. I'd like to filter out that switching noise. The load is just an instrumentation amplifier, so the peak current ...
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127 views

Why does this SEPIC buck-boost oscillate so much?

I've made this SEPIC regulator based on this design, using a MT3608 boost regulator, which has the same oscillation (ripple) as this question: I've made these changes: C1=100uF, C2=470uF R2(bottom ...
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44 views

Can MCP16251/2 DC-DC step-up converter tolerate higher input voltage than the set output voltage?

I am trying to figure out the best possible circuit for MCP16251/2 feeding from 2 AA batteries in series with an output of 3.3v. MCP is extremely efficient boost converter with very low quiescent ...
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48 views

Understanding type III compensation network for Buck-Boost DC/DC converter

I'm trying to design a circuit based on Linear Technology's LTC3533 Buck-Boost DC/DC Converter for my own project. One of the last things I have left to do is to calculate the feedback loop ...
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34 views

Efficiency of a switching regulator

I have a 24V power supply line which I would like to transform to 5V (<1A) in order to supply my chips. Voltage regulators would waste a lot of energy in this range. I looked at some datasheets of ...
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60 views

Buck converter ouptut zero voltage

I've designed PCB which uses TPS54531 to generate 5v from 12v input. The circuit as below is similar to the reference circuit from TI. After powered on, the VCC5_TMP read abnormal value 0 instead of ...
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34 views

Calculating RC snubber network current?

I'm trying to pick the components to use with this DC/DC Buck-Boost Converter. At page 13, the datasheet says, that for input voltages higher than 4.5 V I need to add an extra 2Ω/1nF RC snubber ...
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69 views

LM3478/LM5155 configuration on a wide input and output voltage range

In my last question I mentioned the case of obtaining different output voltages from a single switching regulator. I ended up running a successful simulation of such setup in LTSpice using MC34063 and ...
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67 views

Switching between three output voltage settings on a switching regulator

I am currently in the process of designing a load control circuit based on a switching voltage regulator. The assumption is that the regulator would provide three different voltage settings based on ...
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55 views

MIC28515 overheating with high input voltage

I've designed this MIC28515 buck regulator based on the manufacturer schematic reference. I'm planning to run it at 70VIn I'm doing the tests with @ 5V 2A load Temp(Amb) = 20C. When I set a VIn of ...
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66 views

How to overdrive a 5W IR LED for laser tag

I am a bit of a noob regarding electronics, but hey, I guess I need to start somewhere. Here is the premise: I want to build the Arduino Laser Tag Link: and all went fine until I stumbled upon ...
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120 views

Best practices for parallel DC/DC Boost Converters

I'm working on a portable project that takes 4 (appropriately-rated) Li-Ion cells in a 4S configuration (14.46-16.8V) and boosts it to 27V for a 10-20 Ohm resistive load (soldering iron). The ...
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45 views

Slight variation of an LDO output

I'm building a portable measurement device, that internally uses a CMOS sensor hooked up to an ADC converter. It's normally powered from battery, but I also allow it to run when hooked up to USB port (...
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27 views

How to make an electronic switch for a current-mode digital to analog converter?

In a current-mode DAC there is a switch in the current path between virtual ground and actual ground based on width. How can I design the switch used?
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103 views

Power supply for micro(3.3) and LCD(5)

I am designing a board that has an LCD and msp430fr2433. They both need 5v and 3.3v respectively. So I decided to use TPS560430X3FDBVR and TLV70033DSET to provide 5v and 3.3v. I have attached the ...
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696 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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88 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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232 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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46 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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131 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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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
162 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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50 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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119 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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139 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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71 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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38 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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160 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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82 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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95 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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