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BM2P21A Datasheet(PDF) 5 Page - Rohm |
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BM2P21A Datasheet(HTML) 5 Page - Rohm |
5 / 24 page 5/20 Datasheet Datasheet BM2PX1A/BM2PX1B Series TSZ02201-0F1F0A200100-1-2 22. Mar.2017.Rev.002 © 2015 ROHM Co., Ltd. All rights reserved. www.rohm.com TSZ22111・15・001 Block Description (1) Start circuit / AC Voltage UVLO / Discharge function (VH: Pin 5) This IC has a built-in start circuit. The IC also has the AC voltage UVLO (Under Voltage Lock Out) function which stops to operate the pulse operation when the AC voltage lowers at the VH pin, and the discharge function which discharges X-cap if the AC voltage outlet is pulling out. The Application circuit and Block Diagram are shown in Figure 1 and Timing chart is shown in Figure 2. Figure 1. Application circuit and Block Diagram Figure 2. X-Capacitance Discharge / AC voltage UVLO Timing chart A: The AC voltage input is turned OFF. B: After TDISON (Typ.=128ms), so DC/DC is turned OFF and VCC is higher than VCHG1(Typ.=10.7V) that VCC capacitor is discharged. C: VCC becomes higher than VCHG1(Typ.=10.7V), and the IC starts the recharge from VH pin to VCC pin. At this moment, VCC capacitor discharge is stopped. D: It stops charging to VCC pin when VCC becomes higher than VCHG2(Typ.=15.0V). And it starts discharging of VCC capacitor. E: Same as C F: Same as D G: Same as C H: Same as D I: VCC< VUVLO2(Typ.=10.2V) |
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