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BD45282 Datasheet(PDF) 7 Page - Rohm

No. de pieza BD45282
Descripción Electrónicos  Counter Timer Built-in CMOS Voltage Detector IC
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Fabricante Electrónico  ROHM [Rohm]
Página de inicio  http://www.rohm.com
Logo ROHM - Rohm

BD45282 Datasheet(HTML) 7 Page - Rohm

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Technical Note
7/9
BD45
□□□G, BD46□□□G series
www.rohm.com
2009.05 - Rev.C
© 2009 ROHM Co., Ltd. All rights reserved.
Examples of the power supply with resistor dividers
In applications where the power supply input terminal (VDD) of an IC with resistor dividers, it is possible that a through
current will momentarily flow into the circuit when the output logic switches, resulting in malfunctions (such as output
oscillatory state).
(Through-current is a current that momentarily flows from the power supply (VDD) to ground (GND) when the output level
switches from “High” to “Low” or vice versa.)
Fig.21
A voltage drop of [the through-current (I1)] × [input resistor (R2)] is caused by the through current, and the input voltage to
descends, when the output switches from “Low” to “High”. When the input voltage decreases and falls below the detection
voltage, the output voltage switches from “High” to “Low”. At this time, the through-current stops flowing through output
“Low”, and the voltage drop is eliminated. As a result, the output switches from “Low” to “High”, which again causes the
through current to flow and the voltage drop. This process is repeated, resulting in oscillation.
Fig.22 Current Consumption vs. Power Supply Voltage
VOUT
R2
VDD
BD45□□□G
BD46□□□G
GND
R1
I1
V1
ER
CIN
CL
IDD
VDD
VDET
0
Through Current


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