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BM2P011 Datasheet(PDF) 8 Page - Rohm |
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BM2P011 Datasheet(HTML) 8 Page - Rohm |
8 / 23 page 8/19 Datasheet Datasheet BM2PXX1 Series TSZ02201-0F2F0A200010-1-2 24.Sep.2015.Rev.005 © 2012 ROHM Co., Ltd. All rights reserved. www.rohm.com TSZ22111・15・001 (3) VCC pin protection function BM2PXX1 built in VCC low voltage protection function VCCUVLO (Under Voltage Lock Out), over voltage protection function VCC OVP (Over Voltage Protection) and VCC charge function that operates in case of dropping the VCC voltage. VCC UVLO and VCC OVP monitor VCC pin and prevent VCC pin from destroying switching MOSFET at abnormal voltage. VCC charge function stabilizes the secondary output voltage by charging from the high voltage line by start circuit at dropping the VCC voltage (3-1) VCC UVLO / VCC OVP function VCCUVLO is auto recovery protection. VCCOVP is latch protection. Refer to the operation figure-8. VCCOVP built in mask time TLATCH(typ=100us).By this function, this IC masks pin generated surge etc. This function operates detection in case of continuing VCC pin voltage > VOVP (typ=27.5V). 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 rises. D: VCC > VCHG2, VCC charge function is stopped. E: VCC > VOVP1, function is detected F: VCC > VOVP1, continues TLATCH (typ =100us), switching is stopped by the VCCOVP function. G: VH is OPEN.VCC Voltage is fall. H: Same as C. I: Same as D. J: VCC<Vuvlo2, Switching is stopped by the VCC UVLO function K: VCC< Vlatch, released from latch |
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