All Questions
52
questions
0
votes
0
answers
29
views
Current Drawn from Bulk Capacitor at LED-Strip Output
I want to design a power supply (buck converter) which converts 9 V to 5 V and supplies it to the LED strip. The LED strip is a basic 1 meter long 70 LEDs/meter WS2812B strip. In my project, I want to ...
- 15.7k
2
votes
1
answer
172
views
Powering buck converter using charged capacitor
Is it possible to design a buck converter using a charged capacitor to get regulated voltage output? When the capacitor voltage falls below some threshold value the inductor should be able to provide ...
CommunityBot
- 1
0
votes
2
answers
1k
views
Buck converter waveform
It became very hard for me to understand the concepts associated with buck converter waveform. What is the role of capacitor in its output terminal? Is it used for smoothing the voltage ripple? Why ...
- 2,137
0
votes
1
answer
97
views
Should I limit inrush current of this MOSFET buck regulator?
I am building a digitally controlled constant current switching power supply. This circuit will deliver no more than 105 Watts at around 20V from an AC-DC DIN rail SMPS of 250W.
You can see and ...
0
votes
0
answers
45
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5 V to 3.3 V buck with limited input current and large capacitor to cover current spikes?
We need to design a power supply for a 3.3 V WiFi-device. But there are quite some current spikes during WiFi startup. Using the design below there is a risk the 5 V (250 mA max) supply (not mine) ...
- 15.7k
1
vote
1
answer
123
views
Using capacitor with voltage rating close to input voltage
I am using a buck converter in my design. The input voltage is 12V and output voltage is 5V.
The capacitor C331 and C332 are 10 uF 25 V in 1210 package. The inventory have already 16 V 0805 capacitors....
- 36.4k
0
votes
0
answers
52
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Choosing capacitors for Buck Converter – How many Electrolytic, How many Ceramic?
I am working on a high-power buck converter. This converter will be powering a purely resistive load (it’s a literal resistor – a heating element).
However, I am having some issues deciding how many ...
- 45
1
vote
1
answer
38
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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 ...
- 39.9k
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 ...
- 97
0
votes
2
answers
220
views
use of capacitors and inductors in buck converter [closed]
For stepping down voltages, why can't we use a simple resistive circuit and the voltage division rule for the output? Why do we use a buck converter instead? What role do a capacitor and an inductor ...
- 85k
0
votes
1
answer
91
views
When finding ESR/ESL of a ceramic capacitor, what frequency should I assume during a load step?
I want to determine the output droop in a transient load step for a buck converter I am designing.
The output capacitor will supply current during this load step, and there will be a drop associated ...
- 10.3k
3
votes
1
answer
322
views
What might this term (\$N_C\$) be, calculating ripple current for a buck converter output capacitor?
I'm reading through the datasheet for TI's TPS54302 step-down converter, and determining values for support components.
There is a calculation to determine ripple current for the output capacitor ...
- 34.4k
2
votes
3
answers
3k
views
Why is my buck converter emitting smoke and fire?
I am powering my router from a 24 V battery, but the power requirement of router is 12 V/1 A, so I am using an LM2596 buck converter.
The specification for this buck converter is as follows:
Input ...
- 9,270
4
votes
1
answer
192
views
Questions regarding this power module
I'm looking at this power IC module.
I assume it's a buck converter. In that case, on page 16 of the datasheet, Equation 4.1, there's this formula: Rvout = 8.2 kΩ * TRIM. If TRIM is 5, then what would ...
- 9,270
2
votes
1
answer
1k
views
What is the function of the feedforward capacitor on the LM2596-ADJ?
I'm looking at the LM2596S datasheet and notice that on page 7 (figure 3) it recommends a "feedforward" capacitor for the adjustable variant.
The example schematic on page 9 shows a ...
- 24.1k