Skip to main content
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 ...
Justme's user avatar
  • 158k
3 votes
Accepted

Calculating junction-to-ambient temperature rise for switching MOSFET

Temperature rise is what happens after heat has conducted through the materials the MOSFET (die and package) is constructed from, what it's mounted on, and any heat sinking or convection flow along ...
Tim Williams's user avatar
  • 39.5k
3 votes

Calculating junction-to-ambient temperature rise for switching MOSFET

In your case, use the steady-state rating. The transient rating would be, for instance, if you were building in brief overcurrent capacity on a marginal thermal design. Please take notice of the notes....
vir's user avatar
  • 20.3k
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 ...
Spehro Pefhany's user avatar
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, ...
Hearth's user avatar
  • 35.1k
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 ...
Rohat Kılıç's user avatar
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 ...
Spehro Pefhany's user avatar
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
Voltage Spike's user avatar
  • 84.8k
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 ...
Davide Andrea's user avatar
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.
nanash1's user avatar
  • 5,922
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 ...
Lundin's user avatar
  • 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 ...
Simon's user avatar
  • 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 ...
Karl Atkeson's user avatar

Only top scored, non community-wiki answers of a minimum length are eligible