BD52□□G, BD52□□FVE, BD53□□G, BD53□□FVE series
Technical Note
3) 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.)
V1
I
DD
R2
I1
V
DD
Through
Current
R1
CIN
BD52□□
BD53□□
C
L
GND
V
OUT
V
DD
0
Fig.21
V
DET
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.
VDD - IDD Peak Current Ta=25°C
10
BU43xx
BU42xx
BD52xx
BD53xx
Temp - IDD(BD52xx)
0.4
VDD3V
VDD5V
VDD7V
VDD10V
0.1
IDD peak current [mA]
3
4
5
6
7
VDD[V]
8
9
10
1
IDD-peak[mA]
0.3
0.2
0.01
0.1
0.001
0
-50
-30
-10
10
30
50
Temp[°C]
70
90
110
130
Fig.22 Current Consumption vs. Power Supply Voltage
*This data is for reference only.
The figures will vary with the application, so please confirm actual operating conditions before use.
www.rohm.com
© 2009 ROHM Co., Ltd. All rights reserved.
7/9
2009.06 - Rev.B
ROHM [ ROHM ]
