4
votes
Accepted
Buck converter has low frequency ripple with high amplitude
This is "PFM" mode, or pulse frequency modulation. At light loads, instead of keeping the frequency constant, the converter enters a hysteretic mode where it switches only when the output ...
- 23.6k
3
votes
State-space average model of non-ideal buck converter
i myself struggled with this too.
I will show how to derive the equation for a system only containing the ESR resistor for the Inductor and capacitor, as these are the parts bringing some ...
- 31
2
votes
Accepted
Custom buck converter putting out 1V instead of 5V
C15 isn't connected properly. It should go between the BST (pin-6) and SW (pin-5) pins. This is the bootstrap capacitor which provides the level-sifted voltage necessary to drive the high-side ...
- 8,489
2
votes
Accepted
Sampling gain effect in buck converter
Let me try to give a simple answer to this question. Current-mode-controlled converters are made of two loops: an inner current loop and an outer loop which ensures voltage regulation. The error or ...
- 21.1k
2
votes
How to tell if buck converter outputs are isolated?
A buck converter is per definition not isolated.
For the broader term of converter being able to down-regulate but with transformer (and transformer ratio), it would be a forward type converter.
- 13.8k
2
votes
Accepted
Using capacitor with voltage rating close to input voltage
If you take the ISO-16750 standard (electrical standard for road vehicles) as a reference, or if it's a must for your project to meet, then the input voltage capacitors' voltage rating should be ...
- 30.3k
2
votes
Accepted
Buck Converter - Coss Loss
Assuming IL is positive when you turn your high side switch on (Minimum inductor current >0), VSW will start at about -0.7V due to low side diode conduction during the dead time.
Because of this, ...
- 170
1
vote
Accepted
Output Stage Double LC Filter of a buck converter
I think that if the gain and phase margin are good and you can achieve the required loop bandwidth you should be OK as far as the loop goes. However, be sure to test at different load conditions. If ...
- 23.6k
1
vote
Drawer light circuit burns out
Yes, well there could be many things wrong.
That's no way to connect an SFH900 to a transistor or a power supply. But what you drew as SFH900 is not even an SFH900 but some sort of module.
So there is ...
- 138k
1
vote
Sampling gain effect in buck converter
Pulse width modulation used in the control of power supplies essentially causes a phase delay in the loop, similar to the sampling delay in a pure digital system. When the inernal ramp voltage reaches ...
- 132
1
vote
Buck converter with external reference voltage?
Probably more complex than you'd like but the LTC3886 can be digitally programmed (I2C). It has 12-bit digital programmability of output voltage of 2 to 13.8V in 4mV steps and 16-bit digital readback ...
- 384k
1
vote
Circuit to convert 14.8v battery with max 4a discharge current into 12v, 9v and 5v output?
To reduce unwanted interactions (e.g., motor noise vs. control circuits), it's an advantage to have three separate power supplies.
One might derive a 5 V supply from the 12 V rail with resistors and ...
- 3,789
1
vote
AOZ2261 Buck Switching Regulator doesnt give reasonable Output
The IC can't work with VCC = 3.3V because UVLO threshold for rising VCC can be as high as 4.5V. Apply 5V to VCC pin.
The datasheet recommends VCC = 5V which is the voltage that the IC is characterised ...
- 30.3k
1
vote
Accepted
Can I use one 12 V 8 A power supply to provide 5 V 10.5 A power via buck converters?
That will work just fine. The buck converters will need to be at least 52.5/96 = 54.7% efficient, which is such a low requirement that practically any buck converter on the planet can do it.
The Pi 4B ...
- 15.6k
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