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Results tagged with switch-mode-power-supply
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user 38769
A switch-mode power supply (SMPS) switches been fully-on and fully-off states quickly to maintain voltage regulation. They offer lower power dissipation and run cooler than linear regulators that continually dissipate power through a transistor.
1
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1
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174
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At the feedback voltage divider of a voltage regulator, is it ok to choose a large value for...
At the feedback voltage divider of a voltage regulator, is it ok to choose a large value for R2 (the bottom res in divider)?
I have read it makes FB pin noise sensitive ( This is from a customer provi …
CommunityBot
- 1
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1
answer
76
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Why is the common mode current said to be equal in magnitude for both line and neutral when ...
When I look at the current flow for common mode noise current, I don't see equal impedance between the two paths. I think the equality should be valid only if there are symmetrical paths.
Case 1:
In …
- 73.5k
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vote
1
answer
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Can a PFC converter work if input AC voltage is distorted (having harmonics)?
I see the assumption that the input AC volatge is clean (pure AC), in almost all PFC explanation articles.
What if the input AC has some harmonics, say a volatge distortion factor of 10%, would it any …
- 3,156
0
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1
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In a PFC boost converter, would input current distortion happen during initial voltage build...
It is said that "Boost DC voltage output must be higher than the maximum line peak voltage otherwise you will introduce distortion (harmonics)"
Shown below is the simulation output for a PFC boost hav …
- 16.8k
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votes
3
answers
4k
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Why are differential mode chokes (inductors) not generally coupled?
I understand there are both coupled and un-coupled versions of differential mode chokes as shown below.
Which one is better? I see most of the designs having un-coupled version. What is the reason?
Co …
3
votes
1
answer
109
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In LTspice, is there any way I can obtain the frequency response of power converter alone?
I am aware of the following methods. But my intention is to understand the behavior of power converter alone, before adding the controller and feedback loop.
FRA analysis: Provides the open loop freq …
0
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0
answers
52
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How can a power converter small signal model predict transient behaviour during a load step ...
I see small signal model being used to predict the Overshoot/Undershoot of output voltage due to a load step.
How do we justify this approach, since the basic assumption of small signal modelling is …
- 3,156
0
votes
1
answer
59
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PFC circuit: Rectified AC voltage going beyond input AC voltage limits
We have a PFC circuit powered from a bridge rectifier as shown below:
Fig 1:
We have separate sense terminals to detect the AC voltage levels and accordingly enable the PFC converter (sample circuit …
- 9,310
0
votes
2
answers
50
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For an active power factor correction circuit (PFC boost,) is there any characterisation gra...
Just like the regulation graph (ouput voltage vs. input voltage) for a voltage regulator, is there a similar graph (power factor vs. input voltage) for a power factor corrector circuit?
My aim is to u …
- 73.5k
0
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2
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82
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How is live-plug in (hot-swap) different from regular powering ON of a module?
I fail to understand the difference/challenges between the two situations.
Plugging a unit (or circuit card) to a live backplane.
Vs
Plugging it to a dead bus (or inactive power supply) and then turni …
- 180k
4
votes
1
answer
100
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What is meant by Switching charge ( under Gate charge characteristics) in the given MOSFET d...
What is switching charge in this MOSFET datasheet?
The switching actually takes place during Miller region. Hence I belive Qgd should be called as switching charge. But looks like the remianing gate …
- 473k
3
votes
2
answers
514
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Which is the more important switching parameter in MOSFET datasheet? Turn on/off/delay times...
I see both capacitance and timing details mentioned in the MOSFET datasheets.(Ref:)
Which one should be considered for comparing the MOSFET switching performance between 2 MOSFET part numbers?
Note: …
- 473k
5
votes
3
answers
864
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Does turn-on and turn-off delay cause MOSFET switching loss?
I know during rise time and fall time, there are MOSFET switching losses.
Is same the case with turn on and turn off delay?
I don't see any relevant pics in internet with the IDS waveform included. He …
- 3,156
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Does turn-on and turn-off delay cause MOSFET switching loss?
As per this doc, there are no switching losses during delay time, but it can cause gate driver losses.
- 3,156
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0
answers
86
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What is the purpose of connecting the series capacitor to the low side P- channel MOSFET gate?
The datasheet describes CAOUT as a decoupling capacitor. Not sure how it is so ?
My guess on the working of the circuit:
When AOUT is high, CAOUT is gradually charged with +(on left) and right termi …
- 3,156