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BM1P062FJ Datasheet(PDF) 9 Page - Rohm |
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BM1P062FJ Datasheet(HTML) 9 Page - Rohm |
9 / 21 page 9/18 Datasheet Datasheet BM1P061FJ / BM1P062FJ / BM1P101FJ / BM1P102FJ TSZ02201-0F2F0A200090-1-2 22.NOV.2012.Rev.003 © 2012 ROHM Co., Ltd. All rights reserved. www.rohm.com TSZ22111・15・001 ( 3-2)VCC Charge function The VCC charge function operates once the VCC pin >V UVLO1 and the DC/DC operation starts then the VCC pin voltage drops to <V CHG1. At that time the VCC pin is charged from the VH pin through the start up circuit. By this operation, BM1Pxxx doesn’t occur to start failure. The VCC pin voltage is rise, then VCC >V CHG2 , charge is stopped. The operations are 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. Charge operation VCC pin charge operation A:The VH pin voltage rises, the charge starts to the VCC pin by the VCC charge function. B:VCC > V UVLO1 , the VCC UVLO function releases, the VCC charge function stops, the DC/DC operation starts. C:When DC/DC operation starts, the VCC voltage drops. D:VCC < V CHG1, the VCC recharge function operates. E:VCC > V CHG2 , the VCC recharge function stops. F:VCC < V CHG1 , the VCC recharge function operates. G:VCC < V CHG1 , the VCC recharge function stops. H:After a start of output voltage finished, the VCC Pin is charged by the auxiliary winding, then VCC pin stabilizes. |
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