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CS8371 Datasheet(PDF) 5 Page - Cherry Semiconductor Corporation

Part # CS8371
Description  8V/1A, 5V/250mA Dual Regulator with Independent Output Enables and NoCap
PDF  8 Pages
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Manufacturer  CHERRY [Cherry Semiconductor Corporation]
Direct Link  http://www.cherrycorp.com/
Logo CHERRY - Cherry Semiconductor Corporation

CS8371 Datasheet(HTML) 5 Page - Cherry Semiconductor Corporation

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5
Typical Performance Characteristics: continued
0.4
0.2
0
-0.2
-0.4
16
14
12
10
0
100
200
300
400
500
Time (ns)
600
-0.6
0.6
COUT = 0mF
TA = 25°C
Regulator 2 Line Transient Response
Regulator 1 Load Transient Response
2
1
0
-1
-2
1000
5
0
5
10
15
20
25
Time (
ms)
30
-3
3
VIN = 14V
COUT = 0mF
TA = 25°C
+500
0
-500
250
5
0
5
10
15
20
25
Time (
ms)
30
VIN = 14V
COUT = 0mF
TA = 25°C
Regulator 2 Load Transient Response
100
80
60
40
20
1
10
100
1k
10k
100k
Frequency (Hz)
1M
TA = 25°C
VIN = 14V
COUT = 0mF
Regulator 1 Ripple Rejection
Regulator 2 Ripple Rejection
100
80
60
40
20
1
10
100
1k
10k
100k
Frequency (Hz)
1M
TA = 25°C
VIN = 14V
COUT = 0mF
5
1
0.1
.01
0.1
1
10
100
1000
Output Capacitor Size (
mF)
Unstable
Region
TA = 25°C
VIN = 14V
RESR £ 1.6W
IOUT = 5ma to 1A
Regulator 1 Stability
Definition of Terms
Dropout Voltage:
The input-output voltage differential at
which the circuit ceases to regulate against further
reduction in input voltage. Measured when the output
voltage has dropped 100mV from the nominal value
obtained at 14V input, dropout voltage is dependent
upon load current and junction temperature.
Current Limit:
Peak current that can be delivered to the output.
Input Voltage:
The DC voltage applied to the input terminals
with respect to ground.
Input Output Differential:
The voltage difference between the
unregulated input voltage and the regulated output
voltage for which the regulator will operate.
Line Regulation:
The change in output voltage for a change in
the input voltage. The measurement is made under
conditions of low dissipation or by using pulse tech-
niques such that the average chip temperature is not
significantly affected.
Load Regulation:
The change in output voltage for a change in
load current at constant chip temperature.
Long Term Stability:
Output voltage stability under accelerat-
ed life-test conditions after 1000 hours with maximum
rated voltage and junction temperature.
Output Noise Voltage:
The rms AC voltage at the output, with
constant load and no input ripple, measured over a
specified frequency range.
Quiescent Current:
The part of the positive input current that
does not contribute to the positive load current. The
regulator ground lead current.
Ripple Rejection:
The ratio of the peak-to-peak input ripple
voltage to the peak-to-peak output ripple voltage.
Temperature Stability of VOUT: The percentage change in out-
put voltage for a thermal variation from room temper-
ature to either temperature extreme.



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