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BM2P094 Datasheet(PDF) 8 Page - Rohm |
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BM2P094 Datasheet(HTML) 8 Page - Rohm |
8 / 19 page 8/16 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) VCC pin protection function BM2PXX4 built in VCC low voltage protection function of VCCUVLO (Under Voltage Lock Out), over voltage protection function of VCC OVP (Over Voltage Protection) and VCC charge function that operates in case of dropping the VCC voltage. This function monitors VCC pin and prevent VCC pin from destroying switching MOSFET at abnormal voltage. VCC charge function stabilizes the secondary output voltage to be charged from the high voltage line by start circuit at dropping the VCC voltage. (3-1) VCC UVLO / VCC OVP function VCCUVLO is auto recovery comparator. VCCOVP is auto recovery comparator that has voltage hysteresis. Refer to the operation figure-8. VCCOVP operates detection in case of continuing VCC pin voltage > VOVP (typ=27.5V). This function built in mask time TLATCH(typ=100us).By this function, this IC masks pin generated surge etc. VCCuvlo1=13.5Vtyp ON OFF Vovp1=27.5Vtyp Vchg2= 8.7Vtyp ON OFF OFF ON OFF A BC D F OFF G H IJ VCCuvlo2 8.2Vtyp A Vovp1=23.5Vtyp ON ON OFF ON Vchg1=13.0Vtyp E Figure 8. VCC UVLO / OVP Timing Chart A:DRAIN voltage input, VCC pin voltage starts rising. B:VCC>Vuvlo1, DC/DC operation starts C:VCC< VCHG1, VCC charge function operates and the VCC voltage is rise. D:VCC > VCHG2, VCC charge function is stopped. E:VCC > VOVP1 continues TLATCH(typ =100us), switching is stopped by the VCCOVP function. F:VCC < VOVP2 , DC/DC operation restarts G:VH is OPEN.VCC Voltage is fall. H:Same as C. I:Same as D. J: VCC<Vuvlo2, DC/DC operation stops |
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