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BM1P101FJ-E2 Datasheet(PDF) 9 Page - Rohm |
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BM1P101FJ-E2 Datasheet(HTML) 9 Page - Rohm |
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9 / 23 page  9/19 Datasheet Datasheet BM1P061FJ / BM1P062FJ / BM1P101FJ / BM1P102FJ TSZ02201-0F2F0A200090-1-1 15.Oct.2015.Rev.005 © 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 become more than VUVLO1 and the DC/DC operation starts then the VCC pin voltage drops to less than VCHG1. At that time, the VCC pin is charged from the VH pin. By this operation, BM1Pxxx doesn’t occur to start failure. 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 raises and the VCC pin start to be charged by the VCC charge function. B: When the VCC pin is more than VUVLO1, the VCC UVLO function is released and the VCC charge function stops. Then the DC/DC operation starts. C: When DC/DC operation starts, the VCC voltage drops because of a low output voltage.. D: When the VCC pin is less than VCHG1, the VCC recharge function operates and the VCC voltage rises. E: When the VCC pin is more than VCHG2, the VCC recharge function stops. F: When the VCC pin is less than VCHG1, the VCC recharge function operates and the VCC voltage rises. G: When the VCC pin is more than VCHG1, 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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