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BD64550EFV Datasheet(PDF) 10 Page - Rohm |
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BD64550EFV Datasheet(HTML) 10 Page - Rohm |
10 / 17 page BD64550EFV Technical Note 10/16 www.rohm.com 2010.06 - Rev.A © 2010 ROHM Co., Ltd. All rights reserved. ○ Soft start As shown in Fig.24, VOUTDCDC output voltage becomes up and run step by step with soft start at the time of power-on. Fig.24 Soft Starting Time Timing Chart This soft start method is realized by changing comparator positive side voltage that determines output duty of switching regulator to linear using DAC. Soft start time T1 is constant value regardless of VM voltage. Soft start time T1=23.6msec(typ.) Count finish time T2=32.8msec(typ.) ○ Series regulator operation Inputting switching regulator output into RIN pin (pin 16) enables to drive series regulator circuit. At the time of power-on, output voltage start up step by step with soft starting at the same timing as switching regulator circuit.^Soft start time is 23.6ms (Typ.). Regarding external capacitor of ROUT pin (pin 14), it works normally without setting. But switching noise of switching regulator becomes easy to get in due to dragging on board pattern and the like. Pay attention to switching noise. Fig.25 Series Regulator Block Diagram SS Regulator 0.9V RIN Switching regulator 20kΩ (typ.) 30kΩ (typ.) ROUT DAC COUNTER Internal CLK 1.95kHz CLK195 (Internal) Counter output DAC output VOUTDCDC output voltage Oscillation 1 2 3 4 5 ・・ ・・・・・49・・・ ・・63 64 1.21V T1=23.6[msec] T2=32.8[msec] 0.90V 0V 5.0Vor3.3V 0V SWOUT ~Duty increase~ VMPORH VM voltage Constant ON Duty ON Duty= VDCOUT/VM |
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