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BM1P065FJ-E2 Datasheet(PDF) 9 Page - Rohm |
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BM1P065FJ-E2 Datasheet(HTML) 9 Page - Rohm |
9 / 31 page 9/27 Datasheet Datasheet BM1P066FJ TSZ02201-0F2F0A200200-1-2 30.Oct.2013.Rev.001 © 2013 ROHM Co., Ltd. All rights reserved. www.rohm.com TSZ22111・15・001 Figure 9. Waveform of No-load Startup Figure 10. Waveform of High-load Startup (3) VCC pin protection function This IC includes a VCC pin under voltage protection function VCC UVLO (Under Voltage Protection) and overvoltage protection function VCC OVP (Over Voltage Protection). The VCC UVLO function and VCC OVP function prevent damage to the switching MOSFET that can occur when the VCC voltage drops or becomes excessive. (3-1) VCC UVLO and VCC OVP functions VCC UVLO is an auto recovery type comparator with voltage hysteresis. For VCC OVP, the BM1P066FJ has an latch type comparator. After VCCOVP operation detects, IC stops latch off, and IC does not operate until VCC<VLATCH (typ=VUVLO2 - 0.5). The operation is shown in Figure 11. A mask time TLATCH (typ = 100 us) is built in for VCC OVP to prevent miss-detection. The detection is performed when the VCC pin (pin 6) voltage continues to exceed VOVP1 (typ = 27.5 V) for TLATCH (typ = 100 us). This function masks surges or the like that occur at the pin. (See section (7) below.) Figure 11. VCC UVLO / OVP Time Chart VCC voltage VH voltage Secondary output VCC voltage VH voltage Secondary output Within 64ms Within 64ms |
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