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Results tagged with switch-mode-power-supply
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user 190056
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.
0
votes
1
answer
205
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Prevent spark/surge when connecting power cable (charging input bulk capacitor)
In cheap off-line AC-DC SMPS you will probably notice a huge spark when you connecting the PSU to mains. That usually won't cause problem because your mains is far more capable to handle that surge.
H …
- 429
0
votes
1
answer
105
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Using external trim resistor to control boost converter voltage without introducing noise to...
Requirement:
I want to use external trim to control the output voltage. This will modify/replace the internal R1/RV1/R3 feedback network.
There should be only one trim terminal so it should be refer …
- 429
1
vote
1
answer
730
views
Increase switching frequency of boost converter with MAX1771
The MAX1771(always in DCM, has no oscillator) was chosen as controller for minimum component count: no error amplifier compensation, no slope compensation, no current feedback RC filter, no external …
- 429
1
vote
2
answers
435
views
Need help understanding voltage multiplier in boost SMPS
I made a 4x multiplier on the switch node of a boost circuit.
I don't quite understand how DC pulses behave in a voltage multiplier.
C1, C2, C4, and C10 don't seem to contribute to series discharge. …
- 429
1
vote
0
answers
37
views
5V power supply with battery backup controlled by a single enable pin
Requirement:
at least 1A output
integrated Li-Ion battery charger and boost
a single pin to switch on/off the circuit in all three conditions:
i) external powered without battery
ii) external power …
- 429
5
votes
1
answer
490
views
Why are MOSFETs connected in reverse for synchronous rectification?
I'm trying to understand how synchronous rectification works.
Here is an example in boost topology:
The function of D1 is to allow current from left to right and block right to left.
M3 is a PMOSFET …
- 429