All Questions
19
questions
1
vote
3
answers
59
views
Input capacitance estimation for a buck converter
To estimate minimum input capacitance required for a buck converter to help with power stability & noise suppression, I came across below equation by TI.
https://www.ti.com/lit/an/slyt670/slyt670....
- 61
3
votes
1
answer
200
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
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 ...
1
vote
1
answer
184
views
Buck converter has low frequency ripple with high amplitude
I "designed" a simple buck converter, which is basically a clone of the 5V reference design in the TPS6293x datasheet. The converter is outputting the correct voltage on average, but has ...
- 25
2
votes
2
answers
686
views
How much charging ripple voltage is allowed while charging a LiFePO4 battery?
We are designing a buck controller to charge a LiFePO4 battery (4 series 9 parallel cells, each of 3.2 V).
Hence, we would like to charge the battery pack with 13.90 V but the buck output has got a ...
- 29
0
votes
1
answer
362
views
How to remove 200 mV ripple from my power supply? [closed]
I am using a step-down-converter to get a variable supply output in the range of 2-4 V from a 5 V input voltage from an adapter.
The problem I am facing is that I get a 200 mV ripple which looks like ...
- 65
1
vote
1
answer
168
views
How to minimize the ripple on a buck regulator powering a CM4?
While designing a Raspberry Pi CM4 application board, I found an issue with the power supply.
I selected the same IC as the official CM4 I/O board: the AP64501SP-13. I used even the same values for a ...
- 11
0
votes
0
answers
155
views
DC-DC buck converter inrush start on voltage
I started to examine the behavior of the converters on my custom board. The input to the converter comes from an external supply with a voltage of 20 V, the required output voltage is ~12 V.
When I ...
- 441
0
votes
1
answer
337
views
Acceptable overshoot, accuracy, and control bandwidth of a buck converter
I am designing a closed loop buck converter and was wondering what would be the acceptable values/performance for control parameters like accuracy, control bandwidth, and overshoot.
I know that the ...
- 87
0
votes
1
answer
475
views
Buck Converter Voltage Ripple at Output
I just made a 32V to 16V 2 Amps buck converter with a 10mH inductor, I'm having an issue with the voltage ripple output. Too many spikes, and it's generally not consistent. Electrolytic and Film ...
0
votes
4
answers
108
views
LED DRIVER: Buck Converters output current ripple
I need to design a led driver of up to 1A, to drive some infrared and near infrared LEDs.
Due to the nature of my application, the intensity of the light should be as stable as possible, as ...
- 23
1
vote
1
answer
646
views
Ripple current at output capacitors
I was reading about the selection of output capacitors at the output of buck converters and found this Link
The accepted answer states that before I select an output capacitor, we must fix the ...
user220456
1
vote
0
answers
121
views
Estimating actual capacitance for aluminum electrolytic capacitor in buffer application
Application:
In a capacitor power buffer application it is preferable to have higher voltage over the capacitors to increase the energy density, as the energy E in a capacitor is given by $$E = \frac{...
- 81
4
votes
2
answers
2k
views
Combining Buck converter and LDO
I've been wondering if its common and a good idea to combine a buck converter with a LDO to for example move 5V down to 1V for a microprocessor.
I'm unsure about the stability of the processor doing ...
- 219
0
votes
1
answer
152
views
contradiction in ripple calculation for buck converter
I am having problems understanding ripple calculation for buck converter here (from page 39).
First, the author makes an assumption that the capacitance is large enough so nearly all [not all] of ...
- 1,649