All Questions
Tagged with buck switching-regulator
75
questions
3
votes
1
answer
204
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'...
- 33
1
vote
3
answers
207
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 ...
- 113
1
vote
0
answers
99
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)....
- 61
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 ...
0
votes
2
answers
155
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....
- 411
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 ...
- 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 ...
- 411
0
votes
5
answers
397
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, ...
- 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 ...
- 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 ...
- 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 ...
- 411
0
votes
1
answer
39
views
Switching regulator Design
I am designing a switching buck converter from 7.5V to 5V using the AP62200TWU-7 converter.
This converter operates at fSW=750kHz Switching Frequency.
The required output current is around 0.5A.
using ...
- 41
0
votes
0
answers
78
views
Can the MP9488 circuit be operated at 333mA output current?
I am looking to use the MP9488 as a buck Switching Regulator with a voltage output of 12V and output current of 333mA. In the application note it has an output current of 300mA.
As far as I understand ...
0
votes
3
answers
64
views
Current and voltage value before inductor pin in buck converter
In buck converter we know that pure DC current will be after inductor pin. But what will be the current/voltage value before it.
Let’s take an example, the buck converter circuit with 12 V input to 3....
- 543
1
vote
2
answers
680
views
How can I power an ESP32 with a 54V battery using a buck converter?
I need to power an ESP32 board from a 54 V battery. For that purpose, I understand that I need to step it down to 5 V so I need to design a step-down buck converter.
I tried the following circuit ...
- 133
1
vote
2
answers
115
views
Can anyone see why I'm killing my buck regulator?
I've tried hard, but I can't figure it out. The buck regulator runs for about about 1 s and then it dies with the buck regulator shorted to ground.
The LDO is working fine. If I power the LDO with 5.5 ...
- 145
0
votes
1
answer
302
views
Two Synchronous Buck Converters as Bridge Drive to Peltier
I am looking to control a peltier without using PWM at the device leads (filtered PWM). The usual circuits I have seen is by having a regulated supply as the source to the top FETs on an H-bridge to ...
- 183
2
votes
5
answers
276
views
I calculated the power loss of a switching regulator and it doesn't match the datasheet. Am I missing something?
I'm trying to figure out how On Semi's LM2575D2T-5G is only 77% efficient. It's the fixed 5 V output version of the component.
The datasheet gives Vin = 12 V and Iload = 1 A. Based on this, power in = ...
- 21
3
votes
1
answer
111
views
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 ...
- 411
3
votes
2
answers
190
views
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 (...
- 1,800
0
votes
2
answers
44
views
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 ...
- 1,800
0
votes
3
answers
1k
views
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 ...
- 1
0
votes
1
answer
583
views
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 ...
- 3,032
-1
votes
2
answers
273
views
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 ...
- 555
0
votes
2
answers
186
views
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?
- 2,593
2
votes
1
answer
704
views
Switching regulator vs converter
Is there any difference between switching regulators and converters? I have read about step-down voltage regulator and buck converters and they seem to be the same. So, can I use the term converter ...
- 37
0
votes
2
answers
104
views
How can the output current be programmed in the LTC3649 step-down regulator?
I use Analog Devices' LTC3649 regulator as a step-down regulator. It is said that there is a programmable output current in the datasheet, but I have no idea how to do this. Does anyone have an idea ...
- 11
0
votes
2
answers
607
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 ...
- 109
1
vote
0
answers
105
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 ...
- 155
1
vote
2
answers
1k
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 ...
user220456
1
vote
1
answer
3k
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....
user220456
1
vote
1
answer
337
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 ...
- 35
0
votes
0
answers
359
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, ...
- 55
2
votes
1
answer
54
views
Should I avoid a switching frequency close to my target SPI or CAN frequency?
I have a kind of an open-ended question.
If I'm designing a board with a buck converter and have picked out my peripherals, and say for example I want to run my CAN FD interface at 1MHz baud and maybe ...
- 143
2
votes
2
answers
398
views
What is wrong with my buck regulator circuit using the RY8310 IC?
A component in a larger circuit I've designed is a step-down regulator circuit. It provides an output voltage of 18V from an input of up to 29V. For no other reason than the PCB manufacturer had it ...
- 183
0
votes
0
answers
126
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 ...
- 67
2
votes
2
answers
496
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 ...
- 786
0
votes
1
answer
85
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 ...
- 11
1
vote
0
answers
77
views
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 ...
1
vote
4
answers
496
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 ...
- 211
6
votes
3
answers
2k
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....
1
vote
2
answers
875
views
Using LM2596 step-down with Li-po
I'm doing a project with an ESP32 (3.3 V), a DHT11(3-5 V), a soil sensor (3.3-5 V, the cheapest Chinese), NRF24L01 (2.6-3.6 V).
I'm using LiFePO4 right now (3.32 V), but when the battery voltage drops ...
1
vote
1
answer
1k
views
Step down converter design calculation
I am using a Step Down Converterto step down 3.3V to 1.8V with a Load current of 500mA.
I have an output inductor of 10uH and 1.2A rated current.
I have designed my converter with the help of this TI ...
user220456
2
votes
4
answers
529
views
300VDC to 24VDC voltage converter - Cheapest implementation
In an application, 100+, 100W 24V halogen lamps need to be individually controlled and run simultaneously. They stay on for a few seconds at a time and need to have very constant irradiation.
...
- 8,096
2
votes
1
answer
1k
views
Will a buck converter allow current to pass through if Vin is less than the configured output voltage?
In general, will a buck converter allow current to pass through if Vin is less than the configured output voltage?
Specifically, I'm reading the TPS54308 datasheet and I'm not seeing an answer to my ...
- 245
1
vote
1
answer
92
views
Buck converter inductor calculation doesn't agree with typical application schematic
Im trying to play around with some buck converters and have found one that I might want to make a circuit with. The IC I want to use is the the TPS53125 in QFN package. It's a dual output buck ...
- 127
6
votes
3
answers
1k
views
Configuration of Multiple Buck Regulators on One PCB
I have been doing a lot of switching regulator research for a board design that uses two buck regulators on the PCB to get 9V and 3.3V out from a 12-28V DC supply. The majority of my questions have ...
- 337
0
votes
2
answers
740
views
No Output From LM2596-5T from TI. Any Ideas Why?
So I built a board with LM2596-5T as the voltage regulator. Below are my schematics.Just as described in the datasheet.
And the layout is as below:
After assembling, the output is at 0V. Vpin12 is ...
- 17
1
vote
0
answers
66
views
Stable 12V 1.5A
I'm in need of a stable 12V 1.5A power which I could carry with myself.
One way of doing it would be to strap, say, 12x 1.2V rechargeable batteries and use LM317. But then I read about buck ...
- 133
0
votes
2
answers
316
views
AC analysis on transient model of Buck converter
I'm unable to understand why can't we run AC analysis on a transient model of Buck converter.
- 53