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BU45L422 데이터시트(PDF) 11 Page - Rohm |
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BU45L422 데이터시트(HTML) 11 Page - Rohm |
11 / 17 page www.rohm.com © 2013 ROHM Co., Ltd. All rights reserved. TSZ02201-0R7R0G300130-1-2 TSZ22111 ・ 15 ・ 001 11/14 17.May.2013 Rev.003 BU45Kxxxx, BU46Kxxxx, BU45Lxxxx, BU46Lxxxx series Datasheet Examples of the power supply with resistor dividers. In applications wherein the power supply voltage of an IC comes from a resistor divider circuit, an in-rush current will flow into the circuit when the output level switches from “High” to “Low” or vice versa. In-rush current is a sudden surge of current that flows from the power supply (VDD) to ground (GND) as the output logic changes its state. This current flow may cause malfunction in the systems operation such as output oscillations, etc. Fig. 19 When an in-rush current (I1) flows into the circuit (Refer to Fig. 19) at the time when output switches from “Low” to “High”, a voltage drop of I1×R2 (input resistor) will occur in the circuit causing the VDD supply voltage to decrease. When the VDD voltage drops below the detection voltage, the output will switch from “High” to “Low”. While the output voltage is at “Low” condition, in-rush current will stop flowing and the voltage drop will be reduced. As a result, the output voltage will switches again from “Low” to “High” which causes an in-rush current and a voltage drop. This operation repeats and will result to oscillation. VOUT R2 VDD BU45xxxxx BU46xxxxx GND R1 I1 V1 CIN CL IDD VDD VDET 0 In-rush Current Fig. 20 Current Consumption vs. Power Supply Voltage |
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