{455} If Open Circuit In SMPS Secondary Side, What Will Happen?

in this video number {758} i explainedIf Open Circuit In SMPS Secondary Side, What Will Happen? What Will Happen? if there is output rectifier, secondary winding, filter, dry soldering or open tracks or disconnected wiring track, the vcc capacitor on smps controller ic's vcc pin will fluctuate, and bulk capacitor or main dc smoothing capacitor will fluctuate, but there will no output at output terminal.
download L2269 SMPS circuit sample circuit diagram https://bit.ly/3FwVqou
if we have open circuit in feedback network, in that condition the output will fluctuate in above and lower from the rated levels. there will fluctuation on vcc capacitor and bulk capacitor or smoothing capacitor
if we have some component short circuit in secondary side, there will output in some hundred millivolt with fluctuation and vcc capacitor and smoothing capacitor or bulk capacitor will fluctuate
SMPS Output voltage Fluctuation / Switch Mode Power Supply Output Not Regulated. smps output fluctuation term is used when the output voltage of switch mode power supply are not being regulated properly. irregulated amplitude of the output in any smps is called fluctuation
it may be due to many reasons
1. main dc capacitor is internally open circuit
2. vcc capacitor of smps ic is open internally
3. vcc circuit / bias circuit / auxiliary circuit is open circuit
4. output circuit have some short circuit capacitor
5. feedback circuit is not working properly, it may be due to reference circuit, TL431 reference, or optocoupler or its related components

#electronicscreators #smps_output #fulctuation
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00:12 L2269 smps circuit working explained
01:00 how feedback works in switch mode power supply
01:30 how SMPS controller ic fluctuates or restarts
02:35 how to power up a power supply circuit for testing
04:46 why vcc capacitor voltage is fluctuating
05:36 SMPS have no output voltage
07:06 reason smps output voltage fluctuation