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Motor de Búsqueda de Datasheet de Componentes Electrónicos |
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Motor de Búsqueda de Datasheet de Componentes Electrónicos |
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AN1376 Datasheet(PDF) 22 Page - STMicroelectronics |
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AN1376 Datasheet(HTML) 22 Page - STMicroelectronics |
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22 / 35 page  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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