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BM2P31B Datasheet(PDF) 7 Page - Rohm |
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BM2P31B Datasheet(HTML) 7 Page - Rohm |
7 / 24 page 7/20 Datasheet Datasheet BM2PX1A/BM2PX1B Series TSZ02201-0F1F0A200100-1-2 22. Mar.2017.Rev.002 © 2015 ROHM Co., Ltd. All rights reserved. www.rohm.com TSZ22111・15・001 (3) VCC pin protection function The IC has a built-in VCC low voltage protection function VCCUVLO (Under Voltage Lock Out), an over voltage protection function VCCOVP (Over Voltage Protection), and a VCC recharge function that operates in case of a drop in VCC voltage. The VCC charge function stabilizes the secondary output voltage charging from high voltage lines by the start circuit when the VCC voltage drops. VCC UVLO / VCC OVP function VCCUVLO is an auto recovery comparator with a voltage hysteresis. And VCCOVP is a latch Type or auto restart Type comparator. (The type of a latch or auto restart is different by products series.) VCCOVP has a built-in mask time. This detects when the condition that VCC pin voltage is higher than VOVP1 (Typ.=27.5V) continues for TLATCH (Typ.=100us). This function masks such as a surge generated at pin. Figure 4 is showed about the time chart of VCC OVP latch Type VCC charge function This IC has the recharge function. VCC charge function operates when the VCC voltage drops lower than VCHG1(Typ.=10.7V) after once VCC becomes higher than VUVLO1(Typ.=15.5V) and the IC starts. At that time the VCC pin is charged from the VH pin through the start circuit. Through this operation, BM2PXXA/BM2PXXB prevents failure. When the VCC pin voltage rises higher than VCHG2(Typ.=15.0V) by charging, the IC stops it Figure 4. VCC UVLO / OVP Timing Chart A: The VH voltage input, VCC pin voltage starts rising. B: When the VCC voltage is higher than VUVLO1(Typ.=15.5V), VCC UVLO is released and DC/DC operation starts. C: When the VCC voltage is lower than VCHG1 (Typ.=10.7V), VCC charge function operates and the VCC voltage rises. D: When the VCC voltage is higher than VCHG2 (Typ.=15.0V), VCC charge function stops. E: When the condition that VCC voltage is higher than VOVP1 (Typ.=27.5V), continues for TLATCH (Typ.=100us), the switching is stopped by the VCCOVP function. F: When the VCC voltage is lower than VOVP2(Typ.=23.5V), DC/DC operation doesn’t restarts because of latch function. G: The high voltage line VH is drops. H: Same as C I: Same as D J: When the VCC voltage is lower than VUVLO2(Typ.=10.2V), VCC UVLO function operates. K: When the VCC voltage is lower than VRESET(Typ.= VUVLO2-0.5), LATCH function is released. |
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