BD12KA5F(2009) データシートの表示（PDF） - ROHM Semiconductor
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BD12KA5F Datasheet PDF : 10 Pages
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BD□□KA5,BD□□KA5W Series,BD00KA5W Series
Technical Note
●Terminal Vicinity Settings and Cautions
・Vcc Terminal
Please attach a capacitor (greater than 1μF) between Vcc and GND.
The capacitance values differ depending on the application, so chose a capacitor with sufficient margin and verify the
operation on actual board.
・GND Terminal
Please be sure to keep the set ground and IC ground at the same potential level so that a potential difference does not
arise between them. If a potential difference arises between the set ground and the IC ground, the preset voltage will not
be output properly, causing the system to become unstable. Please reduce the impedance by making the ground patterns
as wide as possible and reducing the distance between the set ground and the IC ground as much as possible.
・CTL Terminal
31.25kΩ
The CTL terminal is turned ON at 2.0V and higher, and OFF at
CTL
0.8V and lower, within the operating power supply voltage
range.The power supply and the CTL terminal may be started
25kΩ
up and shut down in any order without problems.
Fig.23 Input equivalent circuit
●Vo Terminal
Please be sure to attach an anti-oscillation capacitor between Vo and GND.
100
Oscillation region
発振領域
OUT
10
IC
Stable region
安定領域
1μF
1
Cin
ESR
Vcc
Vcc OUT 1μF
1μF
VCTL
CTL GND ADJ R2
Io(ROUT)
0.1
2V
R1
R1=30kΩ,R2=2kΩ
Fig.24 Output Equivalent Circuit
0.01
0
100
200
300
400
500
Iout(mA)
Io(mA)
Fig.25 ESR-Io Characteristics
Be sure to place an anti-oscillation capacitor between the output terminal and the GND. Oscillations may arise if the
capacitance value changes, due to factors such as temperature changes. A 1μF capacitor with small internal series
resistance (ESR) such as a ceramic capacitor is recommended as an anti-oscillation capacitor. Ceramic capacitors generally
have favorable temperature characteristics and DC bypass characteristics. When selecting a ceramic capacitor, a high
voltage capacitor (good DC bypass characteristics) with temperature characteristics that are superior to those of X5R or X7R,
is recommended. In applications where input voltage and load fluctuations are rapid, please decide on a capacitor after
sufficiently confirming its properties according to its specifications in the actual application.
120
120
100
50V Max.Input
100
120
50V Max.Input
100
80
80
60
60
40
16V Max.Input
40
10V Max.Input
20
20
16V Max.Input
10V Max.Input
80
X7R
X5R
Y5V
60
40
Vdc=0
20
0
0
1
2
3
直D流C バbypイassアVスdc(VV)dc（V)
(a) Capacitance-bypass
characteristics (Y5V)
0
0
4
0
1
2
3
4
-25
0
25
50
75
直流DバC bイypアasスs VVdcd(Vc)（V)
（b）Capacitance-bypass
TTeemmpp(℃(℃) )
（C）Capacitance-temperature
characteristics（X5R,X7R）
characteristics（X5R,X7R,Y5V）
Fig.26 :General characteristics of ceramic capacitors
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6/9
2009.04 - Rev.A
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