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BM2PA95F Datasheet(PDF) 8 Page - Rohm |
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BM2PA95F Datasheet(HTML) 8 Page - Rohm |
8 / 23 page 8/19 Datasheet Datasheet BM2PXX5F/BM2PXX6F/BM2PXX7F/BM2PXX8F Series TSZ02201-0F2F0A200210-1-2 28.Oct.2016.Rev.002 © 2012 ROHM Co., Ltd. All rights reserved. www.rohm.com TSZ22111・15・001 (2) Start sequences (Soft start operation, light load operation, and auto recovery operation during overload protection) Start sequences are shown in Figure 7. See the sections below for detailed descriptions. Figure 7. Start Sequences Timing Chart A: Input voltage VH is applied. B: This IC starts operating when VCC > V UVLO1 (13.5 V Typ). Switching function starts when other protection functions are judged as normal. When the secondary output voltage becomes constant, VCC pin current causes the VCC voltage to drop. As a result, IC should be set to start switching until VCC<V UVLO2 (8.2V Typ). C: With the soft start function, over current limit value is restricted to prevent any excessive rise in voltage or current. D: When the switching operation starts, VOUT rises. Once the output voltage starts, set the rated voltage within the T FOLP period (128ms Typ). E: When there is a light load, it makes FB voltage < V BST (0.3V Typ). Burst operation is used to keep power consumption down. During burst operation, it operates at low-power consumption mode. F: When the FB pin Voltage>V FOLP1A(2.8V Typ), it overloads. G: When the FB pin voltage keeps V FOLP1A (= 2.8V Typ) at or goes above T FOLP (128ms Typ), the overload protection function is triggered and the switching stops. During the TFOLP period (128ms Typ), if the FB pin voltage becomes <VFOLP1B even once, the IC’s internal timer is reset. H: If the VCC voltage drops to < V UVLO2 (7.7V Typ) or below, restart is executed. I: The IC’s circuit current is reduced and the VCC pin value rises. (same as B) J: Same as F K: Same as G |
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