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BD86852MUF-C Datasheet(PDF) 35 Page - Rohm |
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BD86852MUF-C Datasheet(HTML) 35 Page - Rohm |
35 / 46 page 35/43 TSZ02201-0A3A0AP00520-1-2 © 2020 ROHM Co., Ltd. All rights reserved. 03.Mar.2020 Rev.001 www.rohm.com TSZ22111 • 15 • 001 BD86852MUF-C 3.8 Application Circuit Example (Using the EN Resistance) - continued It is necessary that each output voltage is OFF before VUVLOVCC turns ON to make outputs sequentially OFF. Discharge time after each output turns OFF to LVD starts can be calculated by the following expressions. �������� = − ������������ × ���������������������������� // ������������������������ × ln( �������������������� ������������ ) VOi COi RLOADi RVOiDIS Li SWi Figure 31. Discharge Resister Where: RVOiDIS: Discharge resistor (DCDC2, DCDC3) VLVDi: LVD Operating Voltage RLOADi: Load resistor Co: Output capacitor Vo: Output Voltage DCR of Li is not considered VCC Internal SS3 (DC/DC3) VO3 (DC/DC3) Internal SS2 (DC/DC2) VO2 (DC/DC2) VO4 (EXT_LDO) = FB_LDO PGOOD VTH_EN1 VUVLOVREG_OFF t2:VO2 Discharge Time VLVD12 VLVD32 VLVD42 VLVD41 VLVD21 VLVD31 VTH_EN2 EN VREG Internal SS1 (DC/DC1) VLVD22 SS3 finish 4576 clk SS2 finish 4576 clk VO1 (DC/DC1) = VS2, VS3, VS4 200 μs (Typ) SS1 finish 4576 clk EN_LDO tPGOOD = 10 ms VUVLOVS_OFF VUVLOVCC_ON t3:VO3 Discharge Time VO4 Discharge Time Figure 32. Output Timing Chart (Using the EN Resistance) |
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