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BM2P012 Datasheet(PDF) 8 Page - Rohm |
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BM2P012 Datasheet(HTML) 8 Page - Rohm |
8 / 23 page 8/19 Datasheet Datasheet BM2PXX2 TSZ02201-0F2F0A200030-1-2 24. Sep.2015.Rev.005 © 2012 ROHM Co., Ltd. All rights reserved. www.rohm.com TSZ22111・15・001 (3) VCC pin protection function BM2PXX2 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 auto recovery protection. And they have voltage hysteresis. Refer to the operation figure-8. Swiching is stopped by the VCCOVP function when VCC pin voltage > Vovp1 (typ=27.5V), and Swiching is restart when VCC pin voltage < Vovp2 (typ=23.5V) Figure 8. VCC UVLO / OVP Timing Chart A: DRAIN voltage input, VCC pin voltage starts rising. B: VCC> V UVLO, 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, continues TLATCH (typ =100us), switching is stopped by the VCCOVP function. F: VCC < VOVP2, Switching operation restarts 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 |
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