전자부품 데이터시트 검색엔진 |
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BD64008MUV 데이터시트(PDF) 22 Page - Rohm |
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BD64008MUV 데이터시트(HTML) 22 Page - Rohm |
22 / 39 page TSZ02201-0P2P0B001840-1-2 16.Nov.2020 Rev.005 TSZ22111 • 15 • 001 22/36 BD64008MUV © 2017 ROHM Co., Ltd. All rights reserved. www.rohm.com 3 SWREG ― continued 3.5 SWREG1 Soft Start (at power-on, with ENBSW1 = L) At the time of power-on, VOUT1 ramps up slowly with a soft start The rising edge of SWREG1 is synchronized with the timing when ENBSW1 = L and POR release. Figure 11. SWREG1 Soft Start Operation Timing Diagram This soft start method is realized by linearly changing the negative side voltage of the gmAMP by using DAC. Soft start time t1 is constant, regardless of VBB. Parameter Specification Unit Min Typ Max Soft start time (t1) 6.97 8.20 9.43 ms Count finish time (t2) 13.94 16.40 18.86 ms Oscillation Constant ON Duty ON Duty = VOUT/VBB Duty Increase t2 = 16.4 ms (Typ) t1 = 8.2 ms (Typ) VOUT1 x 75 % 50 ms (Typ) 0 1 2 32 63 VUVHYS (depends on the external resistor) SWOUT1 Counter output ENBSW1 POR signal DAC1 output VOUT1 0 V 1.0 V 0 V 2.0 V 3.9 kHz CLOCK (Generated by dividing the internal standard clock) VBB VPORH (7.0 V Typ) VPORL (6.0 V Typ) (VPORH-VPORHY) VUV (depends on the external resistor) 0 V RESET output UVDET output |
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