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BM1P107FJ-E2 Datasheet(PDF) 7 Page - Rohm |
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BM1P107FJ-E2 Datasheet(HTML) 7 Page - Rohm |
7 / 31 page 7/27 Datasheet Datasheet BM1P105FJ TSZ02201-0F2F0A200170-1-2 2.Oct.2013.Rev.001 © 2013 ROHM Co., Ltd. All rights reserved. www.rohm.com TSZ22111・15・001 The operating waveform at startup is shown in Figure 7. Secondary output Switing VH Voltage VCC(5pin) VH input current A B C VUVLO1 ISTART1 ISTART3 ISTART2 Set voltage VSC D Figure 7. Operating Waveform at Startup A: VH voltage is applied when plugged into the outlet. At that time, charging starts from the VH pin via the start circuit to the VCC pin. At that time, VCC < VSC (typ = 0.8 V), so the VH input current is limited to ISTART1 by the VCC pin short protection function. B: Since VCC voltage > VSC (typ = 0.8 V), VCC short protection is cancelled and current flow is from the VH input current. C: Since VCC voltage > VUVLO1 (typ = 13.5 V), the start circuit is stopped and the VH input current flow is only ISTART3 (typ = 10 uA). When switching starts, secondary output begins to increase, but since secondary output is low, the VCC pin voltage is reduced. The drop rate of VCC is determined by the consumption current between the VCC pin capacitor and the IC and by the load current connected to the VCC pin. (V/t = Cvcc/Icc) D: Since secondary output has risen to a constant voltage, voltage is applied from the auxiliary winding to the VCC pin, and VCC voltage is stabilized. |
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