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AN1523 Datasheet(PDF) 12 Page - STMicroelectronics

Part # AN1523
Description  11W FLYBACK CONVERTER FOR AUXILIARY POWER SUPPLY APPLICATION USING THE L6590
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN1523 Datasheet(HTML) 12 Page - STMicroelectronics

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AN1523 APPLICATION NOTE
12/24
As clearly indicated by the waveforms, the circuit starts to work in hiccup mode, keeping the current mean value
of the shorted output at levels within component rating. Because the working time and the dead time are im-
posed by the charging and discharging time of the auxiliary capacitor C2, it is almost constant varying the input
mains voltage thanks to the internal start-up current source already mentioned.
Short-Circuit Tests @ Stand-by
A short circuit when the SMPS works at light-load is always a critical fault condition for any power supply circuit.
In this condition, the energy deliverable to the short is the maximum one, and then it is the most stressing situ-
ation for the output rectifiers and besides, sometimes the primary hiccup mode is not triggered. This may hap-
pen because the short circuit reflected impedance on the auxiliary winding it is not low enough for decreasing
the Vcc voltage below the under-voltage lockout threshold or spikes are present at turn off on the auxiliary wind-
ing which are capable of powering the IC. The proposed circuit, even in this load condition, provides the same
results as the previous tests, both at 115Vac and at 220 Vac, making it reliable in all the working situations
independently from the transformer coupling.
Figure 23. SHORT ON +5V
Figure 24. SHORT ON +5V
Vin = 88 Vrms - 50 Hz @STAND-BY
Vin = 265 Vrms - 50 Hz @STAND-BY
CH1:
VPIN1 – DRAIN VOLTAGE
CH1:
VPIN1 – DRAIN VOLTAGE
CH2:
VPIN3 - Vcc
CH2:
VPIN3 -Vcc
CH4:
ISHORT CIRCUIT
CH4:
ISHORTCIRCUIT


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