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BD9536FV Datasheet(PDF) 10 Page - Rohm |
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BD9536FV Datasheet(HTML) 10 Page - Rohm |
10 / 19 page Technical Note 10/18 BD9536FV www.rohm.com 2010.07 - Rev.A © 2010 ROHM Co., Ltd. All rights reserved. ● Explanation of Operation The BD9536FV is a 2ch switching regulator controller incorporating ROHM’s proprietary H 3Reg CONTROLLA control system. When VOUT drops due to a rapid load change, the system quickly restores VOUT by extending the TON time interval. H 3RegTM control (Normal operation) (VOUT drops due to a rapid load change) ● Timing Chart ・ Soft Start Function Tss(ON)= 50kΩ×Css [sec] Rush current: IIN = Co × VOUT Tss [A] ・・・ (2) ・・・ (3) When FB falls below the threshold voltage (REF), a drop is detected, activating the H 3REG CONTROLLA system. HG output is determined by the formula above. When FB (VOUT) drops due to a rapid load change, and the voltage remains below REF after the programmed tON time interval has elapsed, the system quickly restores VOUT by extending the tON time, improving transient response. Soft start is utilized when the EN pin is set high. Current control takes effect at startup, enabling a moderate “ramping start” on the output voltage. Soft start timing and input current are determined via formula (2) and (3) below. Soft start time: (Css: Soft start capacitor; Co: Output capacitor) FB REF HG LG EN REF IIN TSS(ON) VOUT FB REF HG Io LG TON+α tON= REF VIN × 1 f [sec]・・・(1) |
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