All Questions
99
questions
0
votes
1
answer
56
views
What should I do when clearance boundaries overlap with SMD pins?
I am brand new to layout design. I am using the TPS62136RGXR buck converter in my design. However, according to the attached image, the pin's clearance boundaries (0.2mm according to JLCPCB's assembly ...
- 55
0
votes
2
answers
79
views
Power Board Optimization
I've created a buck converter schematic that converts an input voltage of around 16.8V to 5V at 8A using the Sic477 buck converter. You can see my design below. While it produces the correct output ...
1
vote
2
answers
97
views
Question on Turn-off Snubber Operation
I'm struggling to understand how this snubber circuit reduces power loss during the off time for this buck converter. Anybody able to explain it's operation / what is happening for each component ...
- 13
4
votes
4
answers
573
views
Inductor energy storing in buck converter
I am trying to understand inductor energy storing during ON time in buck converter.
Energy stored in inductor of buck converter is (Input Power -Output Power)*Ton
Lets say output power is 5 W and ...
- 119
0
votes
3
answers
115
views
Validate my 3V3 power system
My Power System, can someone validate it? I'm not familiar with using the TPS63060.
Datasheet can be found at: https://www.ti.com/product/TPS63060
I'm trying to power a ATMega328p-AU + 4 digit 7-...
0
votes
2
answers
109
views
Power Converter Average Modelling
This image is from Christophe Basso presentation. It has been mentioned in the slide that average model can predict the transient response but I have one question when we say average model then it ...
- 119
0
votes
1
answer
111
views
I need to make a separate buck and boost converter with 200W power rating
I have to make two converters. One buck going from 240VDC to 12VDC 30 amperes and one boost from 12VDC to 24VDC, possibly with the ability to change from 6 to 30 amperes.
A few more details: The buck ...
0
votes
1
answer
118
views
AP63203 Buck not working
Recently I have been experimenting with the AP63203, and I just have not been able to get it to output 3.3V successfully. Currently, the way I have been testing it is using an SMT to TH adapter, which ...
- 1
0
votes
1
answer
47
views
PMIC PCA9450B Not Working
The PCA9450B is utilized to power up the iMX8 Mini Processor chip, which incorporates multiple voltage regulators. However, I am experiencing issues with the output voltages on the output side, ...
0
votes
1
answer
45
views
Buck Converter - C_OSS charging up loss
Consider the following synchronous buck converter:
where Q1 is the high-side and Q2 the low-side
(https://fscdn.rohm.com/en/products/databook/applinote/ic/power/switching_regulator/...
- 87
1
vote
1
answer
73
views
Power dissipation formula
Is the below formula, present on page 26 of this buck converter correct to use?
Or should I use the formula mentioned in the 3 paragraph of this accepted answer?
- 1
2
votes
1
answer
174
views
How to model PCB parasitics
I am working on a buck converter on a PCB. I would like to run some LTSpice simulations to see the impact of the parasitic inductances and resistances of the traces and coupling capacitances.
Is there ...
- 87
2
votes
2
answers
321
views
How can I replace a potentiometer with a fixed resistor on a buck converter?
I want to use a buck converter which steps down 12 V DC to 5 V constant DV output to power my custom PCB.
I came across a buck converter in market which can do it but there is potentiometer on it ...
- 99
0
votes
0
answers
59
views
Reduce voltage ripple in wall power supply and buck converters
For my project I choose a wall AC/DC power supply (AEJ160PS12) with output voltage at 12V and intend to use some buck converters to step down from 12V to 6V and 3.3V. The chosed buck converters is ...
- 29
0
votes
0
answers
31
views
PMIC MIC23451 operating voltage range
I am using Microchip SOM module in my project. Not using all the things in the SOM.
So we are redesigning the board with necessary components for my application.
Below is block diagram shows the main ...
- 2,593
2
votes
1
answer
132
views
Output Capacitor Design for a Multiphase Buck Converter
According to this application note from Texas Instruments, in the design of the output filter for a multiphase buck converter there are basically two ways of choosing the output capacitor. The first ...
0
votes
1
answer
79
views
Power stage of a buck converter as VCCS
In a buck converter using current-mode control as control loop, why can the power stage be seen as a voltage-controlled current source? Is it possible to understand that from a simple equation?
- 324
0
votes
0
answers
58
views
Using 2 LiPo Batteries via 2 Buck Converters for External Notebook Power Supply - will it work?
I have an old ThinkPad X220T notebook of which the internal battery is broken (and removed).
To get my notebook working on the go again I want to build an external portable power supply with 2 LiPo ...
5
votes
1
answer
247
views
Art of Electronics - buck converter ripple current derivation
I'm struggling to understand how this buck converter equation in The Art of Electronics can be true.
Page 642 shows this Buck Converter:
and then these graphs of current and voltage are also provided
...
- 165
1
vote
0
answers
55
views
Boost converter output voltage drops
I'm using an MIC2251 (MIC2251-1YD5-TR) in a design to boost a lithium battery (3.6V-4.1V) to 5.4V for powering a small camera peripheral that requires a typical draw of 80mA. I expect that the worse ...
user220456
1
vote
1
answer
259
views
Selecting PFC topology
I'm considering different PFC topologies for the AC-DC stage of a device around 1 kW with aim of optimizing for efficiency and secondarily component size. This far I have identified following options:
...
1
vote
1
answer
185
views
Identity a QFN chip
I would appreciate your help in identifying an electronic chip in a QFN package with 24 pins that belongs to a Roland R-05 sound recorder.
The component is located near the DC/battery input and I ...
- 59
2
votes
3
answers
1k
views
Buck converter adjustable output-voltage using digital potentiometer [closed]
I am trying to design a buck converter using an LM2576HV (Vref: 1.23 V) and a digital potentiometer (input: 48 V, output: 0 to 48 V, Imax= 3 A).
The digital potentiometer with the highest supply ...
- 21
0
votes
2
answers
198
views
Design that outperforms buck converter
Above is quoted from here. I was just shocked to find out that the first image provides a much more efficient and simpler way to step down a voltage instead of using a buck converter circuit (second ...
1
vote
1
answer
152
views
DC-DC converter circuit LM5164
I would like to build a DC-DC converter circuit using EasyEDA that can output about 80V from 7 Nissan Leaf battery modules that are about 55V nominal.
I am looking at the datasheet for the LM5164 and ...
- 339
1
vote
1
answer
84
views
PSRR of an amp + ADC input stage
I have an input stage that consists of an amplifier then an ADC. The op-amp and ADC are powered by Buck voltage regulators.
I want to measure the PSRR of this stage, so I am planning on breaking the ...
- 379
1
vote
3
answers
293
views
Buck converter simulation Vout lower than expected
I am trying to design a simple buck converter in LTSpice. Here are my parameters:
...
- 21
1
vote
1
answer
137
views
Reduce the heat output of a MOSFET (buck LM5085)
First of all I have to say that I am a beginner, and I don't have an oscilloscope to work with. Just a multimeter.
I'm trying to design a PoE+ board with a 9.5 V @ 3 A output.
The PoE+ part works fine ...
- 139
2
votes
1
answer
280
views
5V and 12V derived from a regulated 12V supply? Buck converter for 5V, in parallel with 12V load?
Apologies up front — this is super basic, but I’m sleep deprived and on a deadline for a personal project.
This is all DC. I have a 12 V input (via a wall-wart). I need 5 V to power some electronics (...
- 132
2
votes
1
answer
238
views
Critical inductance for buck converter
I have this problem: -
The critical current must be \$P_{out} = V_{out}I_{crit} \Rightarrow I_{crit}=\dfrac{45\text{W}}{16\text{V}} = 2.8125 \text{A} \$
Using eq. 3.43 from Ned Mohan's book we have
$$...
- 4,145