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Questions tagged [switching-regulator]

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

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11 votes
2 answers
2k views

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 ...
Tirdad Sadri Nejad's user avatar
0 votes
3 answers
57 views

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 ...
euraad's user avatar
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1 vote
0 answers
60 views

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 ...
Tirdad Sadri Nejad's user avatar
1 vote
0 answers
45 views

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 ...
Power Path's user avatar
2 votes
0 answers
107 views

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 ...
Richard Kovac's user avatar
0 votes
1 answer
28 views

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 ...
Dynamic_equilibrium's user avatar
3 votes
1 answer
202 views

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'...
Daan32's user avatar
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0 votes
0 answers
104 views

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 ...
Suvi_Eu's user avatar
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1 vote
2 answers
167 views

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 ...
EmeraldMonk's user avatar
1 vote
1 answer
60 views

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, ...
Saláta Szalonna's user avatar
0 votes
1 answer
74 views

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 ...
Anoop Pereira's user avatar
1 vote
1 answer
63 views

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 ...
Joseph Summerhays's user avatar
2 votes
0 answers
93 views

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 ...
Power Path's user avatar
0 votes
1 answer
43 views

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 ...
chami's user avatar
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1 vote
3 answers
200 views

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 ...
Umer's user avatar
  • 113
1 vote
2 answers
68 views

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 ...
user120632's user avatar
1 vote
0 answers
98 views

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)....
Gigapel's user avatar
  • 61
0 votes
2 answers
73 views

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. ...
Blurry Sterk's user avatar
0 votes
2 answers
218 views

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 ...
dizcza's user avatar
  • 127
1 vote
1 answer
296 views

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 ...
Dave's user avatar
  • 337
2 votes
1 answer
831 views

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 ...
Unimportant's user avatar
  • 4,683
1 vote
1 answer
153 views

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 ...
dnrg's user avatar
  • 21
0 votes
1 answer
57 views

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 ...
Arthur Prudius's user avatar
1 vote
2 answers
83 views

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. ...
Antron Mack's user avatar
0 votes
1 answer
45 views

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, ...
Gonzalo García's user avatar
3 votes
2 answers
182 views

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? ...
Santhosh Kumar H O's user avatar
1 vote
4 answers
336 views

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 ...
afflux's user avatar
  • 13
2 votes
2 answers
142 views

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 ...
miggyEE's user avatar
  • 95
1 vote
3 answers
154 views

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.
Ruqayya Saleh's user avatar
1 vote
3 answers
116 views

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 ...
Balaji Narasimhan's user avatar
0 votes
0 answers
49 views

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. ...
Balaji Narasimhan's user avatar
1 vote
0 answers
61 views

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 ...
henryv3's user avatar
  • 23
3 votes
3 answers
1k views

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....
Juan010's user avatar
  • 41
0 votes
0 answers
107 views

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, ...
mehmet's user avatar
  • 1,139
0 votes
1 answer
67 views

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 ...
EmeraldMonk's user avatar
0 votes
3 answers
129 views

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 ...
EmeraldMonk's user avatar
2 votes
1 answer
160 views

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 ...
Dev's user avatar
  • 61
0 votes
1 answer
46 views

TPS61178 Input Current Limit

I am working with TI TPS61778 and the title of the part says it has a 10 A switch current. This is all fine and dandy but in the electrical specifications, we see that for a RLIMIT of 80.6 k we have a ...
aaronb8's user avatar
  • 13
0 votes
0 answers
70 views

Design procedure for switched capacitor dc-dc converter

I am looking for some references to design a switched capacitor dc-dc converter, however I could hardly find any reference online. I am aware that the design method depends on the actual topology of ...
Dev's user avatar
  • 61
0 votes
2 answers
154 views

How much current should a switching regulator consume on its own?

With your help on stack exchange, I finally finished assembling my first LM5143QRHARQ1-based buck converter! And it works! It does output 7V (well 7.03V) The only problem is that it consumes around 0....
Mito's user avatar
  • 411
0 votes
0 answers
46 views

Varying negative voltage from a switching regulator

I've looked up switching regulators with inverting configurations that can give a varied output by setting feedback resistance. Now I want to vary this voltage through a uC. I didn't find any digital ...
Rahul Shanbhag's user avatar
6 votes
1 answer
904 views

Constant Voltage Spikes in a DC-DC Switching Regulator

I've been developing a low-voltage ripple dc-dc converter (36V to 5V) based on the LMR16030PDDAR to power a sensitive analog video transmitter. When a load is connected to the output, I get a really ...
Alessandro Nardinelli's user avatar
0 votes
0 answers
70 views

Buck / Buck Boost converter as a regulator or rectifier question

I have an older boat with a rectifier like https://www.ebay.com/itm/282755134541 . I understand that these will output 14-17V+ DC. With an increase in RPMs, I understand that the DC voltage increases. ...
Colin Williams's user avatar
0 votes
1 answer
143 views

How to pick an inductor for the LM2576 when not using the recommended options from the datasheet?

I am selecting an inductor for the LM2576HVT-15. The datasheet has some recommendations, but the only recommended options are inductors that and relatively big and have exposed wires. I do not want a ...
Trev347's user avatar
  • 1,062
2 votes
2 answers
113 views

Is the PCB routing for this LM5143A-Q1-based buck converter right?

Thanks to your advice on StackExchange, I'm in the final stage of developing my first LM5143A-Q1-based (link to datasheet) buck converter! It may be a bit rushed as I need to prepare this for a high ...
Mito's user avatar
  • 411
1 vote
1 answer
46 views

Final design considerations for LM5143A-Q1 buck converter. Are these features needed?

After a few days of learning how to make a buck converter using the LM5143A-Q1 TI IC, it's finally becoming a reality! This is the final design, highly inspired from page 30 in the datasheet, some ...
Mito's user avatar
  • 411
0 votes
5 answers
395 views

Shielding Buck Converter

I have a simple question, and I want to ensure that nothing unexpected happens. I'm currently working on a Raspberry Pi-based robot project with a Pi camera, and I plan to power it with a battery, ...
M-125's user avatar
  • 53
1 vote
1 answer
38 views

How to choose the right type and values of capacitors for LM5143A-Q1 output?

While learning and trying to make my first buck converter using the LM5143A-Q1 (datasheet link) from TI, I calculated the required capacitance at the output for the IC to be able to output 31A, which ...
Mito's user avatar
  • 411
2 votes
1 answer
114 views

How to choose the right inductor for buck converter with LM5143A-Q1? (from TI)

While working on my first voltage regulator circuit I got stuck at calculating the inductor value... The IC is LM5143A-Q1 from Texas Instruments, and according to the datasheet, the formulas for ...
Mito's user avatar
  • 411
0 votes
1 answer
31 views

How to put the LM5143A-Q1 IC in voltage adjustment mode? (From Datasheet)

I'm trying to make my first voltage regulator circuit using the LM5143A-Q1 Buck IC. The datasheet does include examples and all the values required to get the 3.3/5V fixed output, but it barely has ...
Mito's user avatar
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