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参数资料
| 型号： | TK7403232LCLEX |
| 厂商： | TOKO INC |
| 元件分类： | 固定正电压多路输出LDO稳压器 |
| 英文描述： | DUAL OUTPUT, FIXED POSITIVE LDO REGULATOR, PDSO8 |
| 封装： | SOT-23, 8 PIN |
| 文件页数： | 4/30页 |
| 文件大小： | 913K |
| 代理商： | TK7403232LCLEX |
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TOKO@Inc.
IC Data Sheet
TK740xxL
May 2001
GC3-H010 /D
Page 12
Standard Application
Typically, give the capacitor as
large a value as practical in
consideration of the temperature
characteristic. The output noise
and ripple noise decrease with a
larger
capacitance
value.
In
addition, the response to the output
side load change also improves.
Output voltage change
The output voltage on both sides can be set by using R1 and R2. The output voltage is decided by the ratio
of R1 and R2. The error of the output voltage usually grows.
Noise reduction (Improvement of ripple rejection ratio)
Please connect Cfb with the FbA terminals (1 and 2) and the FbB terminals (3 and 4). It is possible to use Cfb
only on the needed side.
The tantalum capacitor is the best in this application. A small
capacitance is sufficient (0.1
F, 0.22F, etc.). When the ceramic capacitor is used, the noise grows in the low
current region. If 1.0.( Rs1) is connected in series with the ceramic capacitor, the same characteristics as
a tantalum capacitor can be obtained. Please adjust the output side capacitor to the value in which stable
operation is done over all required temperature ranges. Damage will not be caused by enlarging this value.
Increasing this value will decrease the ripple noise and improve the output load transient response. However,
the risetime using the on/off control becomes slower. It is possible to use the noise reduction application with
the output voltage change application above.
ContB
u in
CL A 1.0 ε
1
4
5
8
CL B 1.0 F
GND
VoutB
VoutA
ContA
0.1
F
Cfb
Cfb =4700pF
We recommend 4700pF for Cfb
0
100
10000
200
1000
100
Noise
(V)
@Iout=50`200mA
Cfb(pF)
TK74028
Cfb@VS@Noise Level (A=B)
100000
CL=1.0
F@Tantalum
CL=1.0
F@MLCC
10
1
ContB
Vout
iR1 R2 +1 j~ 1.19
22k R2
R1(K ) (Vout 1.19 |1) ~
R2
u
in
CL B
0.1 F
(1.0 F)
GND
1
4
5
8
CL A
0.22 F
(1.0 F)
VoutB
VoutA
ContA
0.1
F
R1
R2
R2f
R1f
u in
CL A
0.1 ε
(1.0 F)
GND
1
4
5
8
CL B
0.1 F
(1.0 F)
VoutB
VoutA
ContA
ContB
0.1
F
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