tk71741scl Toko Inc., tk71741scl Datasheet - Page 5

• Manufacturer Part Number: tk71741scl
• Description: Dropout Voltage Regulator
• Manufacturer: Toko Inc.

October 2001 TOKO, Inc.
Noise Performance
250
200
150
100
300
70
65
60
55
50
45
40
35
30
50
0
0
0
♦
♠
BPF = 400 Hz ~ 80 kHz
25
CL = TANTALUM
TK71730S NOISE vs. C N
♠
I OUT = 30 mA
10
50 75 100 125 150 175 200
NOISE vs. I OUT
CL = CERAMIC
I OUT (mA)
100 1000 10000 100000
C N (pF)
♦
♠
♦
CL = CERAMIC
TYPICAL PERFORMANCE CHARACTERISTICS
C N = 0.01 µF
♦
♠
CL = 0.22 µF
CL = 0.47 µF
CL = 1.0 µF
CL = 2.2 µF
CL = 10 µF
CL = 0.2 µF
CL = 0.4 µF
CL = 1.0 µF
CL = 2.2 µF
CL = 10 µF
V IN
A
I IN
V CONT
C IN = 0.22 µF
0.01
V
10
70
60
50
40
30
20
0.1
10
1
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
I CONT
0.01
A
TEST CIRCUIT
I OUT = 30 mA
C N = 0.01µF
CL = 1.0 µF (TANTALUM)
GND
On/Off C ONT
NOISE vs. FREQUENCY
V IN
C N = 0.10 µF
FREQUENCY (kHz)
NOISE vs V OUT
0.1
TK71730S
CL = 0.22 µF (CERAMIC)
C IN = 10 µF
I OUT = 10 mA
V OUT (V)
BPF = 400 Hz ~ 80 kHz
1
Noise Bypass (V REF )
C N = 0.01 µF
V OUT
10
CL = 0.22 µF
C N = 0.001 µF
100
70
65
60
55
50
45
40
35
30
I OUT
For better noise reduction it is
more effective to increase C
without increasing CL.
The recommended C
tance is 6800 pF or 0.01 mF.
As the output voltage increases,
the noise will also increase.
0
♦
25
V
♠
50 75 100 125 150 175 200
NOISE vs. I OUT
I OUT (mA)
TK717xxS
CL = TANTALUM
♦
♠
C N = 0.01 µF
CL = 0.22 µF
CL = 0.47 µF
CL = 1.0 µF
CL = 2.2 µF
CL = 10 µF
N
capaci-
Page 5
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