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BM2PA98F Datasheet(PDF) 10 Page - Rohm |
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BM2PA98F Datasheet(HTML) 10 Page - Rohm |
10 / 23 page 10/19 Datasheet Datasheet BM2PXX5F/BM2PXX6F/BM2PXX7F/BM2PXX8F Series TSZ02201-0F2F0A200210-1-2 28.Oct.2016.Rev.002 © 2012 ROHM Co., Ltd. All rights reserved. www.rohm.com TSZ22111・15・001 ( 3-2)VCC charge function BM2PxxxF has the recharge function. VCC charge function operates once the VCC pin >V UVLO1 and when the DC/DC operation starts. The VCC pin voltage then drops to <V CHG1. At that time the VCC pin is charged from the DRAIN pin through the start circuit. Through this operation, these series prevent failure. VCC pin voltage rises until VCC >V CHG2. The operation is shown in figure 9. VCC VUVLO1 VUVLO2 VCHG1 Switching VH charge charge charge OUTPUT voltage VCHG2 charge charge AB C D E F G H VH Figure 9. VCC Pin Charge Operation A: DRAIN pin voltage rises, charges VCC pin through the VCC charge function. B: VCC > V UVLO1, VCC UVLO function releases, VCC charge function stops, DC/DC operation starts. C: When the DC/DC operation starts, the VCC voltage drops. D: VCC < V CHG1 , VCC recharge function operates. E: VCC > V CHG2 , VCC recharge function stops. F: VCC < V CHG1, VCC recharge function operates. G: VCC > V CHG2 , VCC recharge function stops. H: After the output voltage is finished rising, VCC is charged by the auxiliary winding, and VCC pin stabilizes. |
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