All Questions
Tagged with ripple switch-mode-power-supply
22
questions
4
votes
1
answer
2k
views
Ringing/Noise on smps output while BJT turns on
I am trying to build a 4watt SMPS with 5v output.The design uses BJT switching in quasi-resonant mode. Though I could get the 5V output, I am observing ringing in the output which is increasing the ...
- 43
4
votes
1
answer
2k
views
Design buck converter to meet output ripple voltage specs
I am stuck at calculating output ripple voltage with non-ideal components for buck converter. As you can see from the picture, the output ripple voltage caused by each individual component is ...
- 1,649
2
votes
2
answers
2k
views
Reducing Voltage Ripple in a Switching Converter.
I used TI's workbench to design a simple 24 to 12V @ 6A. I have it built in a PCB board, but I started doing some power measurements and notice the output voltage ripple is quite high at loads bigger ...
- 871
2
votes
1
answer
2k
views
Flyback output ripple voltage formula
Does anyone is able to demonstrate this formula?
Where Co is the output capacitance, Rc is the ESR associated to the capacitors, Io is the output current of the particular output, fs is the switching ...
- 2,478
1
vote
1
answer
693
views
Flyback converter design using UC3843
I am designing a offline power supply which will 24 V as output with 2.5 A. I found UC3843 as better option. I used TI we bench tool to design my power supply. This is the schematic I got from it. The ...
- 11
1
vote
2
answers
13k
views
capacitor voltage ripple in buck converter
I am struggling with output voltage ripple calculation of the buck converter below. Firstly, I don't understand the following statement from the lecture. Can anyone explain it?
If the capacitor ...
- 1,649
1
vote
1
answer
3k
views
Pi filter design for SMPS output ripple
Given a circuit like a buck-converter like the AOZ1284PI in a circuit such as this one:
Or push-pull converters such as this one:
If one was to design at the output a low-pass PI filter with a ...
- 469
1
vote
1
answer
285
views
Timebase effect on measuring ripple on SMPS
hey everyone i get straight to the point, look at these two pics below are we losing anything in the peak-peak measurement when using 5us instead of 5ms?(they are two different units)
if yes by mow ...
- 21
1
vote
1
answer
208
views
Removing peaks (noise) in the output of Switch Mode Power Supply
simulate this circuit – Schematic created using CircuitLab
I have a 220/24V SMPS, which I use to power 2 buck convertors in chain. First one 24-12V, and the second one 12-5V. With this setup I ...
- 59
1
vote
0
answers
87
views
What could be the reason if the AC coupling option goes away when I attach a differential probe (P6248) to a Tek MSO5204 scope?
When the scope is not attached, I could see both AC coupling and DC coupling options for the channel settings. The moment I attach the differential probe, the AC coupling option goes away. Any reason?...
- 3,032
1
vote
0
answers
80
views
Design of a boost converter with large variation in output current and low output ripple
I'm working on the design of a 24V to 30V boost converter that needs to have an output ripple of less than 100 mV with an output current between 0 and 2 A.
The output is used to power a controller for ...
- 31
1
vote
3
answers
1k
views
SMPS Input/Output ripple current and ripple voltage
I found a presentation regarding SMPS and found this slide.
I am not totally able to grasp the concept of the input and output ripple current.
In the above image I have the following questions :
I ...
user220456
1
vote
0
answers
554
views
PWM Dimming Causes Flickering
I designed a 24V PWM dimmer. Basically, it drives a 24V-LED-strip with low-side switching using a MOSFET driven by a 1-kHz-PWM having 1-100% duty-cycle.
There are no problems when the circuit is ...
- 36k
0
votes
2
answers
3k
views
How does the inductor current ripple influence a switch-mode power supply?
I am looking into several DC/DC switching controllers. When talking about component selection, many datasheets and application notes say that inductor ripple should be kept around 20-40% of the ...
- 572
0
votes
2
answers
1k
views
Does polarity of scope probe matter when measuring ripple of the power supply module?
Measuring ripple of 28V/12V power supply module across +/- output pins. Does the probe tip have to be placed at +pin and probe gnd to -pin, or it can be reversed?
Having inverted readings when ...
- 131