Datasheet > BD48E24G-TR

BD48E24G-TR

更新时间： 2022-12-29 18:40:44

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罗姆 - ROHM		/
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Standard CMOS Voltage Detector IC

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BD48E24G-TR 数据手册

Datasheet

BD48xxx series BD49xxx series

3) 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.

VDD

BD48xxx

BD49xxx

VOUT

CIN

GND

Fig.18

When an in-rush current (I1) flows into the circuit (Refer to Fig. 18) 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.

IDD

Through Current

VDD

VDET

Fig.19 Current Consumption vs. Power Supply Voltage

www.rohm.com

TSZ02201-0R7R0G300030-1-2

22.May.2013.Rev.008

14/15

TSZ22111・15・001

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