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AN2432 Datasheet(PDF) 9 Page - STMicroelectronics

Part # AN2432
Description  This document describes a 60W adapter application using
PDF  27 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2432 Datasheet(HTML) 9 Page - STMicroelectronics

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Adapter features
AN2432
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In DCM operation, the gate-drive turn-on is still triggered by the falling edge of the CK pin
voltage, while turn-off is determined by the INHIBIT pin voltage crossing the -25mV internal
threshold. Figure 8 and Figure 9 show this mechanism at full load and VIN = 230VAC
conditions.
Figure 6.
VIN = 115VAC - CCM
Figure 7.
CCM - Anticipation detail
CH1: L6668 gate drive
CH2: STSR30 gate drive
CH3: STSR30 CK pin
CH1: L6668 gate drive
CH2: STSR30 gate drive
CH3: STSR30 CK pin
Figure 8.
VIN = 230VAC - DCM
Figure 9.
DCM - INHIBIT synchronization
CH1: L6668 gate drive
CH2: STSR30 gate drive
CH3: STSR30 CK pin
CH3: STSR30 CK pin
CH4: STSR30 gate drive



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