4
votes
Using only ceramic capacitors on an input of an SMPS - unclear advice from manufacturer
The ESR is exactly the reason why.
Assume you have pure capacitor with no ESR and you connect it to a voltage supply with a wire which is a pure inductance, you get an LC oscillation which never ...
- 159k
2
votes
Help me to identify an SMD component marked 'NM' in an SOT-89 package
I think @Tony is correct, the photos match lcsc's listing for the 2SCR533P5T100 and 2SCR533PT100. The latter is NRND and the difference between the two appears to be grade related- the electrical and ...
- 407k
2
votes
How to sample current in high-kHz to low-MHz
There are several important parameters you don't specify, but generally, this looks like exactly the sort of thing that wide-bandwidth current transformers are made for. Pearson (no affiliation) is, ...
- 35.2k
2
votes
Accepted
MOV and resistor selection of smps,flyback converter
What is the use of that resistor(10 ohm 2Watt) ?
It's a fusible, quite possibly wire-wound, 10Ω-2W resistor. It acts as both an inrush limiter and a fuse.
I think I should place it as shown in the ...
- 36k
2
votes
Using only ceramic capacitors on an input of an SMPS - unclear advice from manufacturer
simulate this circuit – Schematic created using CircuitLab
Consider these two circuits. The current sink is a timed step current of 100mA.
The problem with the barely damped ringing with little ...
- 407k
1
vote
What are the VDDSD, VLXSD, and VFBSD pins?
In the datasheet, it shows what all these pins do:
Source: https://www.st.com/resource/en/datasheet/stm32wb09ke.pdf
- 84.8k
1
vote
Accepted
Constant output voltage in buck-boost converters
I've tried to understand why the voltage across the inductor is constant. I think it is thanks to the generator to which the inductor is connected in parallel, and which provides constant voltage, so ...
- 17k
1
vote
Accepted
Distribute power from one battery to multiple devices
All these components on that system, works in certain amount (range) of voltage, right?
Right.
how can I create a system - above the main system - to distribute power correctly
Do not power the ...
- 22.8k
1
vote
Help me to identify SMD diodes marked '1DN'
The markings and package seem to match with a CITC B1DWGL-SN rectifier diode. The package is SOD-123S which seems about right from the picture.
- 5,947
1
vote
Swapping CANH and CANL kills my power converter
U5. 5V and 3V3 doesn't seem connected to any other net. They should be connected as done with U4 or otherwise the IC will obviously not work and might get damaged.
U1. Why are there no caps? You need ...
- 21.2k
1
vote
Relation between crossover frequency of loop gain and closed loop's corner frequency when feedback is not unity
I think your confusion comes from the definition of the closed-loop bandwidth.
The closed-loop bandwidth is defined as the frequency where the magnitude of the closed loop gain is -3 db down from the ...
- 342
1
vote
Can varnish affect the performance of the air gap in an SMPS transformer?
Change of phase of materials often results in change of mass or in this case thickness. Water to ice for instance.
If the varnish filling the gap expands on curing you have a new gap size and new ...
- 11
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