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参数资料
| 型号： | TK740SIL-2727 |
| 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： | 15/29页 |
| 文件大小： | 584K |
| 代理商： | TK740SIL-2727 |
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Page 22
January 22, 2002 TOKO, Inc.
TK740xxL
APPLICATION INFORMATION
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 deteremed by the ratio of R1 and
R2. The error of the output voltage usually grows because of the tolerance of the external parts.
NOISE REDUCTION (IMPROVEMENT OF RIPPLE REJECTION RATIO)
Please connect C
FB with the FBA terminals (1 and 2) and FBB terminals (3 and 4). It is possible to use CFB only on the needed
side. A tantalum capacitor is the best in this application. A small capacitance is sufficient (0.1
F, 0.22 F, etc.). When
the ceramic capacitor is used, the noise grows in the low current region. If 1.0
. (R
S ≥ 1) 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
output voltage change application above.
GND
VIN
CONT A
0.01
F
CONT B
4
8
VOUTB
VOUTA
CL B
0.1
F
(1.0
F)
CL A
0.1
F
(1.0 F)
GND
VIN
CONT A
0.01
F
CONT B
4
8
VOUTB
VOUTA
CFB = 4700 pF
CL B
≥ 1.0 F
CFB
CL
≥ * * F:
Any capacitor can be used
CL A
≥ 1.0 F
4700 pF is recommended for C
FB
GND
VIN
CONT A
0.01
F
CONT B
4
8
VOUTB
VOUTA
CL A
0.22
F
(1.0
F)
CL B
0.1
F
(1.0 F)
R2’
R1’
R2
R1
R1(K
) = (VOUT ÷ 1.19 - 1) x R2
VOUT = (R1 ÷ R2 + 1) x 1.19
22 k
≥ R2
IOUT = 50 to 200 mA
TK74028 NOISE LEVEL vs. CFB (A = B)
200
100
NOISE(
V)
0
1
10
100
1k
10k
100k
CFB(pF)
CL= 1.0
F TANTALUM
CL= 1.0
F MLCC
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