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BD46315 Datasheet(PDF) 12 Page - Rohm

Part No. BD46315
Description  Counter Timer Built-in CMOS Voltage Detector IC
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Maker  ROHM [Rohm]
Homepage  http://www.rohm.com
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BD46315 Datasheet(HTML) 12 Page - Rohm

 
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Datasheet
Datasheet
12/13
BD45xxx series
BD46xxx series
TSZ02201-0R7R0G300010-1-2
© 2013 ROHM Co., Ltd. All rights reserved.
15.Nov.2013 Rev.007
www.rohm.com
TSZ22111・15・001
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.
Fig. 21
When an in-rush current (I1) flows into the circuit (Refer to Fig. 21) 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
BD45xxx
BD46xxx
GND
R1
I1
V1
CIN
CL
IDD
VDD
VDET
0
In-rush Current
Fig. 22 Current Consumption vs. Power Supply Voltage


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