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AN1376 Folha de dados(PDF) 22 Page - STMicroelectronics

Nome de Peças AN1376
Descrição Electrónicos  25W QUASI-RESONANT FLYBACK CONVERTER FOR
PDF  35 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN1376 Folha de dados(HTML) 22 Page - STMicroelectronics

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AN1376 APPLICATION NOTE
22/35
15 SWITCH ON AND TURN OFF IN SHORT CIRCUIT CONDITION
■
FULL LOAD
■
SHORT ON 3V3 BY ACTIVE LOAD
The following pictures describe the SMPS behaviour during the start-up phase with an output
voltage shorted. As clearly visible the circuit starts correctly then it works in hic-cup mode pro-
tecting itself. The start-up phase is clean in all conditions, without showing any dangerous tran-
sition for the SMPS circuitry.
Figure 24. START
Figure 25. TURN-OFF
Even at turn off in short circuit the SMPS functionalities are good, protecting properly the cir-
cuit. No any abnormal transition or level has been observed during the tests.
@85 VAC - 50Hz
@265 VAC - 50Hz
@85 VAC - 50Hz
@265 VAC - 50Hz
CH1:
VDD
CH1:
VDD
CH2:
VC11 (Vaux)
CH2:
VC11 (Vaux)
CH3:
+3V3 Vout
CH3:
+3V3 Vout



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