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Datasheet

Datasheet

BM2PXX4 Series

TSZ02201-0F2F0A200070-1-2

28.NOV.2012.Rev.003

© 2012 ROHM Co., Ltd. All rights reserved.

www.rohm.com

TSZ22111・15・001

（

3-2）VCC Charge function

VCC charge function operates once the VCC pin >V

to <V

By this operation, BM2PXX4 doesn’t occur to start failure.

VCC pin voltage is rise, then VCC >V

VCC

Switching

VH charge

charge

charge

OUTPUT

voltage

charge charge

AB C D E

F G H

VH

Figure 9. Charge operation VCC pin charge operation

A:DRAIN pin voltage rises, charge starts to VCC pin by the VCC charge function.

B:VCC > V

C:When DC/DC operation starts, the VCC voltage drops.

D:VCC < V

CHG1

E:VCC > V

CHG2

F:VCC < V

G:VCC < V

CHG1

H:After start of output voltage finished, VCC is charged by the auxiliary winding VCC pin stabilizes.