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TK71580AS Datasheet(PDF) 11 Page - TOKO, Inc

Part # TK71580AS
Description  LOW DROPOUT VOLTAGE REGULATOR
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Manufacturer  TOKO [TOKO, Inc]
Direct Link  http://www.toko.com
Logo TOKO - TOKO, Inc

TK71580AS Datasheet(HTML) 11 Page - TOKO, Inc

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March 2001 TOKO, Inc.
Page 11
TK715xxAS
APPLICATION INFORMATION (CONT)
INPUT-OUTPUT CAPACITORS (CONT)
OUTPUT NOISE IMPROVEMENT
An RC filter can be added to the output stage of the regulator to reduce output noise when the input voltage is high and
the output current only makes small changes. Select a regulator with a slightly higher output voltage because the final
output voltage will be reduced by the RC filter. If the output current does make a large change, the output voltage will
change. The following table shows output noise, and output voltage for various values of R
OUT and COUT using a 3.5 V
device.
V
IN = 4.0 V, CIN = 10 mF (aluminum electrolytic), COUT = (see table), ROUT = (see table)
RIPPLE REJECTION RATIO
An RC filter can be added to the input stage of the regulator to increase the ripple rejection when the input voltage is high.
Even if the resulting difference between V
IN at the regulator (after the RC filter) and VOUT is small the TK71533AS will
output a stable voltage. The voltage dropped across the RC filter depends on the value of the input ripple noise. Select
the value of R
IN such that the lowest value of VIN plus the ripple noise after the RC filter (peak to peak) is the output voltage
plus 0.2 V.
N
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F
µ
0
1F
µ
7
4F
µ
0
0
1F
µC
T
U
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T
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m
0
4
-
0
2
=0
V
0
0
5
.
3V
µ
0
1
2V
µ
0
5
1V
µ
0
3
1S
M
R
E
S
I
O
N
A
m
0
20
1
W
V
6
9
2
.
3V
µ
6
7V
µ
0
5V
µ
0
4S
M
R
A
m
0
38
.
6
W
V
7
8
2
.
3V
µ
8
8V
µ
5
5V
µ
8
4S
M
R
A
m
0
41
.
5
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V
6
6
2
.
3V
µ
0
0
1V
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0
6V
µ
8
4S
M
R
TK715xxA
VOUT
COUT
VIN
CL = 2.2 µF
LOAD ADJ.
IOUT = 20, 30, 40 mA
ROUT
TK715xxA
VOUT
CL
CIN
VIN
LOAD ADJ.
IOUT = 20, 30, 40 mA
RIN


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