Questions tagged [switching-regulator]
It's a type of voltage regulators that rapidly switch a series device on and off.
493 questions
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Ring through a tube electrical symbol - what is it?
What component or action does the tube with a ring through it refer to?
I believe the switch it's attached to is the low side switch of the Analog Devices ADP5090 regulator and they do say that the ...
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How much of an impact do downstream MLCCs have on buck converter phase margin, and how do we mitigate those impacts?
I'm designing a board with a LMR14030-Q1 buck converter which takes 24V in and produces 5.25V out, which then feeds three LD39200 LDOs.
The buck schematic looks like this:
I used TI's WEBENCH tool to ...
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USBc rail filtering with ferrite bead for voltage regulators
I am creating a mixed signal PCB which has two separate supplies: A buck converter for the digital section and an LDO Regulator for the analog one.
Each regulator steps down 5 V from a USB-C supply ...
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DCDC layout review
Here my schematic:
It should withstand an output current of 1 A with an input voltage within 14..17V.
The loads are an MCU, a DC motor and a couple of solenoids. The power supply comes from a LiPo ...
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Why is power good used like this in this application?
My understanding is that power good signal is normally used to pull down the reset pin of the main microcontroller when you have a power issue like overcurrent or any other power problem with the ...
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Excessive Ripple and Fluctuations in Buck Converter Output Using ME3116
I'm experiencing strange behavior with my buck converter. My input voltage is 5V, and I'm aiming for a set output voltage of 3.3V. However, the output is fluctuating significantly, as observed on the ...
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Getting negative voltage from an LM2672
On a power supply board for an X-ray sensor (PAN Sirona) we are getting -9v from an LM137 fed by an LM2672 generating -12V from +5V.
The circuit is likely like that (it is not easy to make sure it is ...
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Help review my schematic for a LiPo + USB power supply and charger
I've recently redesigned this schematic based on the feedback I've received on an earlier post.
Questions:
Will power source switching MOSFETs work in the configuration I'm using?
Will the tri-state ...
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Switching regulator issues?
I'm trying to use a switching regulator (ptr08060w) to step 12V DC down to 2V DC, however it is not achieving this at all (even with no load connected), and is outputting a voltage that varies ...
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Switching regulator output voltage dropping when load connected?
I need a 2 V source capable of providing up to 5 A to supply current to a heating element; I am trying to use a Texas Instruments PTR08060WVD (datasheet) to achieve this, and with an open circuit I do ...
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How to limit the effect of Contactors noise on the electronic circuits?
I have designed an electronic circuit that is used to switch 8 relays in certain circumstances (like 8 times in a minute). Then these relays switch on and off the contactors connected to AC electric ...
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Boost Converter Output Isn't Desired Value
I used the MIC2619 switching regulator for a boost converter application which takes +5V and outputs +12V. After assembling the circuit, the output voltage is only +4.8V. The schematic of the circuit ...
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How to control two pumps with one switch?
I am not an engineer, and I need help.
I have two pumps (A and B) that I want to control them simultaneously (A and B) or individually (A or B). I want to use a single switch with three options:
...
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Why do "dual frequency" or low frequency switching regulators exist when higher frequency is better?
While choosing some buck regulators I came upon some models that have a pin which selects the switching frequency between 2 values; take TPS629210 or TPS62913 for example. I'm just a hobbyist and not ...
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Do I need an input capacitor for a switching voltage regulator, if I already have electrolytic capacitors?
Assume that you're converting 24VAC to 24VDC (which becomes about 32 in reality).
Then you want to covert the 24VDC to 7.5V by using a switching voltage regulator.
You're already using 220 uF caps in ...
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The Switching regulator stops working after random minutes
I've used TPS562242 regulator to step down from 12V battery input, to around 5.6V for two linear regulators (TLV767, 3.3V and 5V). However, the switching regulator stops working after around 1 to 15 ...
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Average Model of Buck Converter
I am trying to understand average model of Buck Converter for Peak Current Mode Control Topology. Below is a snapshot taken from the Christophe Basso Webpage https://powersimtof.com/Spice.htm, from ...
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SiC461 regulators unpredictably dying under load
I am having problems with a design using SiC461 regulators.
I attached a snippet of the relevant schematic file. The problem I am facing is that under load (powering an LED strip with peak current of ...
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In a PFC boost converter, would input current distortion happen during initial voltage build up- when input is higher than output?
It is said that "Boost DC voltage output must be higher than the maximum line peak voltage otherwise you will introduce distortion (harmonics)"
Shown below is the simulation output for a PFC ...
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Inductor magnetic field collapses during switching?
SEE EDITS BELOW
I'm running into some problems with my Buck converter design. During the switching period the inductors magnetic field seems to collapse, which generates some large voltage peaks. That'...
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How can I select a common mode choke for DC/DC power conversion stages
I want to attenuate 15 MHz noise signal using a common mode choke at 5 V power lines stage of a circuit that generate digital signals with less than 100Mhz.
When you use a common mode choke for a ...
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Voltage regulator output signal becomes noisy when connected to a CPU
I am currently working on a PCB where it has two onboard voltage regulators. the first one makes V1in=20 V to V1out= 5.5 V. The second voltage regulator makes V2in=5.5 V to V2out=3.3 V.
The 3.3 V ...
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TPS564247 switching voltage regulator problem
I have been working on a 12 V to 3.3 V DCDC converter that uses the TPS564247 switching regulator IC. Here is the schematic:
The problem is that the IC keeps resetting itself once a second. At first, ...
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Ceiling fan to run on UPS ONLY [closed]
I have my room typically connected on a UPS.
During a power failure, the devices on the lighting line (5 A) are powered by the UPS.
I have an air conditioner installed in my room which is on the ...
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What's the input power of a switching controller?
I'm looking at an Infineon IR11662STRPBF, which is listed as a "switching controller", but I think I've heard elsewhere that it's called a voltage rectifier, or maybe a voltage booster? The ...
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Buck Converter Current Mode Control Simulation
I have downloaded LTspice PWM switch from christophe basso website http://powersimtof.com/Spice.htm file name PWM-CM2-MD2 by Mark Dimattina
I am doing 5.1V converter based on LTC3890 IC so I tried to ...
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Switch Selection in Buck-Boost Controller Designs
I have reviewed several buck-boost controller designs, including the LT8390 nd I am puzzled by the selection of different switches for the buck and boost sections. For instance, on page 27, the ...
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MCU Controlled Buck Converter IC
I am designing for an application where I need a buck converter that takes the voltage from a 2S Li-ion battery (6-8.4 V) and the load I need to drive is 0-6 V and will take 1.2 A max. I need to ...
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Modern and popular ICs for 5 V, 3 A switching regulator [closed]
I'm designing a simple power supply with the following requirements:
Input: 120 VAC - 240 VAC
Output: 5 V @ 3 A
Reasonable cost & future-proof
It seems like the LM2576 switching regulator has ...
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Input filter for switching regulator
I'm trying to create an input filter for a switching regulator for automotive application.
My aim is to make a supply board, where from 24V come out 12V (from the buck) then 10V and 5V (from two LDOs)....
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How does a "high" current switching regulator/converter handle such high current with such a small package?
The package of this converter is very small but it aparently can handle 24A.
Vishay SiC431 3 V to 24 V Input, 24 A microBUCK ® DC/DC Converter
It does not make sense to me with a pin width of 0.3mm. ...
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MT3608 is not switching for particular input voltage
I have PCB printed a board that feeds a 12V led strip from either a Li-ion battery or a 5V USB. With no load, the output is 12V, as it should. As soon as I connect the led strip (80mA at 12V), the ...
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How to get a stable 3.3V/2A output out of a single cell (18650 Li-ion) battery?
In my tiny quadcopter, I need to power a long range wifi card which take 3.3V/2A max as input. The quad runs off a single high current 18650 Li-ion battery.
Are there any chips or modules that will ...
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Is it OK for a TL431 to be power cycled at high frequency?
For a project I have a switched capacitor supply that creates a +15V/-15V output from a single positive input. I also need a small (+-20mA) 5V supply (crude regulation is OK). So I thought I could ...
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Issue regarding LM5117 TINA-TI model
I have been using the Synchronous Buck Converter LM5117 in its typical circuit as described in the datasheet but have not been able to simulate. I have tried the circuit in MicroCap12, LTspice and ...
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LC Filter Creates Ripple Voltage in Buck Converter
I'm currently designing a synchronous buck converter and trying to simulate it in LTSpice.
I know the purpose of L1 and C4 is to act as a filter to smooth out the output, since it would be rapidly ...
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2
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Alternative method of high power constant current drive for LEDs
The only high power, constant current method I am aware of involves using a MOS switch in conjunction with an inductor to alternately power and disconnect the LED, achieving an average current flow.
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Why is my simulation not loading when V2 has no current?
I'm trying to make a two power source circuit that regulates 9V6 to 5V. The supply is not gonna be connected all time, but I want to make sure that when it is connected, just uses the voltage supply, ...
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TPS65251_Formula Error?
According to the formula, R11 will be 20.1kOhm i.e., R11=((1.2-0.8)*40.2k)/0.8 -> 20.1kOhm.
The outcome of 80.4kOhm does seem to be correct but seems issue with the formula. What do you guys think?
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4
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Voltage spikes on switch-mode power supply Vout when disconnecting barrel jack
I have a fairly simple circuit that uses a DC/DC converter (Traco TSR 1-2450E) to generate 5V for my microcontroller board (D1 mini or similar) from a 12V wall wart. I used the TSR 1-2450E because I ...
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Inductor Boost Converter w/ controller
In my boost converter I am seeing the inductor burn after some uses. I am still completing some bench testing but I am hoping my theory of why it is burning is correct.
My theory is since this MOSFET ...
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Dynamo current limiting circuit with LM317
I'm trying to lower current to about 20 mA, but even attaching a resistor of 50 Ω, I'm still not getting the regulated 20 mA or so current with the LM317.
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Boost converter gets hot
I'm building a LCD backlight power supply boosting 5 V to 12 V.
The max current draw from the panel is 12 V 0.4 A.
I am using LMR60214. But the IC is getting hot to touch at full brightness.
I am ...
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Buzzing ringing in boost converter regulator when using PWM in lower duty cycle
I designed a boost converter using TI LMR62014XMF, to convert 5 V to 12 V for using as backlight source in my LVDS display adapter.
The LCD display panel needs 12 V at 0.5 A max for backlight driving.
...
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Could you provide feedback on my LTC2954 and TPS61090 Schematic?
I am a hobbyist diving a bit deeper into designing more complex PCBs. In the past, I have created basic ESP32 based 2 layer PCBs with basic LDOs for supplying power. I am currently working on a more ...
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Using Linear Voltage regulators in parallel for a high current load
I need to build a high current 12 to 5 volt regulator.
This will power neopixels, which draw 60mA each, and we have like 800 of them, so around 48A when all of them are on at full brightness and white....
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Overvoltage protection for ESP32 (3v3)
I am trying to desing a switching regulator power supply for esp32 s3 (3v3). this is my schematic, I am using PAM2310 for switch regulator. I have tested it works fine. But sometimes I am thinking, ...
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Should I consider using two Switching regulators or one switching regulator and a linear regulator
I have a circuit that has an input of 24VDC. The circuit has two different voltage rails requirements. 12VDC @ 0.1A and 8VDC @ 1A. I have decided to use a swithching regulator from 24VDC to 8VDC, and ...
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Better to choose a switching voltage regulator or a fixed voltage regulator
I am designing a circuit which has a 24V input. The circuit however uses 8V and 12V supplies. This whole circuit requires approximately 1A.
I have decided on using fixed voltage regulators that give ...
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Switched capacitor DC-DC converter [duplicate]
Switched capacitor DC-DC converters are often used for low power applications (low output current) while inductor based DC-DC converters are preferred for high power applications.
I've come across ...
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