Questions tagged [switching-regulator]

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

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Current fed resonant Royer converter with switching regulator

In Linear Technology's Application Note 118 https://www.analog.com/media/en/technical-documentation/application-notes/AN118fb.pdf there is the following picture of a current fed resonant Royer ...
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Control problem when changing voltage conversion ratio

If you have a DC/DC converter and, for example, the voltage conversion ratio is M = 1/D with D < 0.5 and ...
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MT3608 wrong output voltage

I designed a 24V boost converter circuit using a input voltage of 5V shown below: After producing the PCB for this, I tested the output voltage and found that the output voltage was at 5V instead of ...
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I built a DIY DC-DC buck regulator. It's getting extremely hot. Why?

I am really scratching my head at this. I don't see anything wrong with my circuit but my regulator gets EXTREMELY hot while in operation. What I'm building is a USB phone charger for my e-bike as ...
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High voltage, high current buck converter/ DC-DC converter

I am in the process of designing a circuit to regulate voltage going into and electric motor. Vin ~= 52v-45v @100A and the motor requires 45V @100A. Is this possible? I haven't seen designs even ...
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Choosing output capacitor for Power converting Switching regulator (Cout_Eff)

I am using R1276S001A-E2-FE to convert my 24 V supply to 3.3 V to power my microcontroller. In order to do the conversion properly I need to choose the output capacitor. I see there are three ways to ...
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Lower voltage coming from the AP63356Q switching regulator at higher load current

I have been running some tests on the AP63356Q switching regulator to view the performance at different loads. I plan to use the regulator to step the voltage down from either 12 or 24 V to 5 V. After ...
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AP63356QZV-7 switching regulator is not producing stable output

I purchased a couple of AP63356QZV-7 switching regulators for testing and I have not been able to get a stable 5 V. Instead, I have observed square waves that can peak to approximately 3.5 to 5 V. The ...
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ISL9111 Not Reaching Stable Output

I have a PCBA power powered by two AA batteries. The power supply is a ISL9111EH30Z-T7A regulator, which provides an output of 3.0 V when powered by two cells. The board itself has a ATSAMR-type ...
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Capacitor selection with current rating for switching regulator

The example design parameters in the TPS54332 datasheet are as follows: In the input capacitor selection section, the values confused me. Selected capacitors parameters are 10uF, ceramic X5R, 25V, ...
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How does a switching regulator behave if its input is equal to its output?

I want a switching regulator (eg LM2596) set to 5v output voltage to work with 5V - 36V input voltage. I know regulators have min dropout voltage. So how does it behave in such a case (Vin=5V when ...
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Switching regulator voltage issue after rework

A switching regulator (TPS63030) on my power management board is showing a weird problem after I opted to re-adjust the voltage output. Note that this particular board has been used successfully in ...
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Supplying power downstream of LM2595 "simple switcher" 5V regulator?

I built a circuit that uses an LM2595 buck regulator to regulate a 12V battery input current to 5V; this is used to power an Arduino's on-board regulator. The Arduino's 3V3 LDO output is then used to ...
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Keep "in voltage" stable of switching regulator

I powered a Raspberry Pi pico (RP) from the Atari Joystick port of a Sega Master System (SMS) (it should be able to supply 5 V and max 100 mA). RP using RT6150B buck-boost like this (+5 V from ...
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Doing digital IoT and some analog circuits without an oscilloscope

In my free time, I do electronic stuff as a hobby (at least for now.) I don't own an oscilloscope or a fancy multimeter due to the terrible financial state of my country. I am in Iran. In some ...
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Powering D1 Mini through 5V pin

I am trying to power a D1 mini (ESP8266) through the 5V pin (not using USB port). I have a 9V transformer connected to a 5V Regulator (5V Regulator) I have set the regulator at 5.42V when there is no ...
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Adjust regulator to output lower than its feedback reference

I am designing an adjustable high current buck converter. The input voltage will be around 12V, but the output needs to be adjustable in the range of 0.2 to 10V. I have decided to use the LM27402 (...
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Interpreting Datasheet Power Circuit Schematic

I'm trying to design a simple 48V to 5V power circuit using the MAX17640. The basic circuit shown on page 19 is simple enough for me to follow but doesn't provide all the resistor values and directs ...
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Regulator controller current capability

I am tasked with the design of a board that needs a buck regulator. This regulator will work on low voltages (Vin ~= 12V, Vout ~= 4V), but high output current is required (> 60A). I decided to use ...
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Probing with oscilloscope fixes noisy circuit

I'm trying to debug very strange behavior I'm seeing while I'm trying to breadboard out a circuit to test the passive values for an LED driver I'm designing. I am designing for a 28 V input and a 25.4 ...
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Can I attenuate ripple noise from a R-78E3.3-0.5 with an LC filter?

In my circuit, I use a R-78E3.3-0.5 to generate the 3.3V supply voltage for a microcontroller from a 24V rail. The total load draws about 10mA. I'm using a 47uF decoupling capacitor at the regulator ...
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Increasing current in circuit

I'm fairly new to circuit design, so excuse me for asking maybe a noob question; I did some research, but because of my lack of understanding I'm not quite sure if my conclusion is the right one. I ...
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PGND and GND on Switching Buck Automotive Regulator

Switching Buck Regulator PGND Elimination We are facing constraints that make it difficult to maintain a PGND plane on our switching buck regulator (datasheet) design due to the fact that the opposite ...
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System level behavioral model for PSSR of a switching regulator

In a design I have a switching regulator (buck for the sake of my example). The switching frequency is much higher than the frequency range of interest and can be safely ignored. However, the input ...
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Switched capacitor ladder is semi-stable but sometimes oscillates

[Edited to add a video of what happens on load application] I've rebuilt the circuit on perfboard and increased the gate resistors to 50 Ohm as that helped the breadboard version but I'm still having ...
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Sense resistor placement in switching regulator

Preface: I am designing a drone. My choice for stepping down voltage is to use a DC/DC switching converter. After using the parametric search of Digi-key, I selected TPS54495RSAT‎ as my SMPS. ...
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Can we add a current limiter circuit to LM2576 fixed voltage version?

I know I can add an external current sense and comparator circuit to the feedback pin of LM2576-ADJ version to limit current, but can we make such a modified arrangement to a fixed version of the ...
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What type of regulator to use? (switching or linear)

I would like to know what type of regulator is better to use in this scenario: (What is best way to convert 15V to 5V 200mAmax with lowest ripple) Vin: 15 V from isolated DC-DC converter (RS6-0515S ...
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How to digitally control the feedback of a switching regulator using digital pot? [updated]

I'm trying to build a digitally-controlled power supply using ordinary LM2596 or equivalent ICs and a microcontroller. the first approach was by using the DAC or a filtered PWM DAC the way this module ...
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How to get sufficient current out of two parallel DC/DC power supplies?

I have two RT8299AZSP (24V adjustable DC/DC switching regulators) chips connected in parallel. They are each rated for 3A, and provide the power to drive a high power UV LED (can't say too much about ...
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I have a height problem (with my switching regulator on a height constrained PCB)

I was planning to use this part (datasheet) (basically MC34063 with thermal shutdown,) but I don´t have enough room above the PCB. I need to keep the components under 2.2mm. According to my ...
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Where is the origin pole in my CM buck SIMPLIS ac simulation?

I know that current mode buck regulators are generally stable as long as they're actually operating in current mode (i.e. the inductor ramp current is large enough to prevent slope compensation from ...
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Buck converter unstable output voltage

I am trying to use an AP6507 to power a Raspberry Pi from a 12V battery. In the datasheet is written that it should provide a continuous current of 3A, but when I try to power the Raspberry Pi, the ...
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How to supply an OLED module with 13V?

I have an OLED module that uses 3V for logic signals and 13V for the LEDs. What is the common way to drive the 13V for OLEDs? With a regulator or some kind of special LED driver? I have seen some LED ...
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Output current effect on inductor value selection for SMPS

Working on designing a power supply based on the TPS5403 SMPS. Datasheet here: https://www.ti.com/lit/ds/symlink/tps5403.pdf Datasheet is different than what I'm used to. Previous SMPS I've ...
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Even when the enable Pin is low, Im getting voltage on the output

Hi, Im using TPS53353DQPR to generate 3V3 from 12V0. Even when the enable pin is low , there is around 2.5V on the output. I removed FB5, still there is voltage on output when enable is low.I tried ...
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1 answer
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understanding inductor parameters when choosing inductors

I need a voltage regulator to drive an OLED display with 13V/ 50mAmp. I have 3.3 Volt to feed it with. I am thinking of using this boost regulator (because it is cheap): regulator This regulator(...
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Why is main ground and circuit ground explicitly separated here?

ST L4971 Switching Regulator is the part in question. Figure 1 and 4 both show similar schematics, with Figure 4 being the diagramme as per their evaluation board. The input capacitor C1, the diode D1,...
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LTC3115 component selection for schematic

For my project I am using the LTC3115 Buck-Boost converter (datasheet) that should provide an output voltage of 8 V and 700 mA with a switching frequency of 2 MHz. The input voltage range is 3.2 V to ...
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LTM4625 Regulator

I am using LTM4625 Step-Down DC/DC µModule Regulator.VIN:12V and Vout:3.3V @5A. My circuit draw 2.9A current from LTM4625. Does my regulator hot? How can I calculate regulator's heat? https://www....
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Will the frequency of a switching regulator have an effect on a microcontroller?

Will the switching frequency of my switching regulator have an effect on my microcontroller? I'm trying to power this microcontroller PIC32MZ0512EFE144-I/PH with a switching regulator from 24V to 3.3V....
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Regulate higher voltage for mcu and tracking pre-regulator

I am currently designing a lab bench power supply using the LT3080. It will have an input of 18V and an output of 0-15V and 1A. I am going to use an Atmega328 to control the limits and a display. For ...
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Switch node ringing: How does high-side MOSFET turn-on time affect the ringing amplitude?

I was trying to understand the ringing in buck converters during turn on. The following equivalent circuit model was found in a website link. My doubt is: How does the turn-on delay of the switch ...
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How to reduce sinusoidal ripple output coming from SMPS?

I have an SMPS producing output of 12V,1Amps. It is giving a voltage ripple (I am not sure if ripple right term for this) as given in image. I donot have permission to make any changes to this SMPS ...
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Noise on LT1624 with shutdown function

In the circuit bellow, based on an LTC1624, with the SHDN input low, the Ith/RUN pin is extremely noisy, with spikes dropping way below the 0.8V shutdown threshold. As a consequence, the circuit can't ...
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Is there a chance that a DC/DC controller was damaged when a bad feedback network caused its output to exceed its absolute max limit?

I'm currently debugging an issue with a DC/DC controller. The part is a LTC3833. It turns out that the engineer who was working on this accidentally pointed to incorrect part numbers for the passive ...
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Capacitor on output of regulator causing short circuit

We were using switching regulator and when we turned on the regulator short was found. C285 was damaged. After removing C285 , regulator worked without any issues. We were suspecting inrush current ...
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Is a run-time adjustable boost converter possible?

I have a power supply that ranges from 12V-30V. I want to power a set of 4 (24V, 1A) solenoids in series. I also want to use a reduced hold current. So, I'm looking for an output of 96V for a time (~...
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Buck / step down voltage in limited space

I am designing a small PCB. The supply voltage is 12V, but I also need 5V with supply of maximum 250mA. The most obvious solution is to use voltage regulator - there are plenty of them and some like ...
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Clarifications needed about buck converter output ripple voltage derivation

I have a question regarding buck converter output ripple. In the below figure, could you please tell me how the area shown in the red circle has a time duration of Ts/2?
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