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CS8121YTVA5 데이터시트(PDF) 4 Page - Cherry Semiconductor Corporation

부품명 CS8121YTVA5
상세설명  5V, 1A Linear Regulator with and ENABLE RESET
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제조업체  CHERRY [Cherry Semiconductor Corporation]
홈페이지  http://www.cherrycorp.com/
Logo CHERRY - Cherry Semiconductor Corporation

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4
Typical Performance Characteristics: continued
Precision Voltage Reference
The regulated output voltage depends on the precision
band gap voltage reference in the IC. By adding an error
amplifier into the feedback loop, the output voltage is
maintained within ±4% over temperature and supply vari-
ation.
Output Stage
The composite PNP-
NPN output structure
(Figure 1) provides 1A
(typ) of output current
while maintaining a
low drop out voltage
(1.2V) and drawing lit-
tle quiescent current
(4mA).
The NPN pass device prevents deep saturation of the output
stage which in turn improves the ICÕs efficiency by prevent-
ing excess current from being used and dissipated by the IC.
Output Stage Protection
The output stage is protected against overvoltage, short
circuit and thermal runaway conditions (Figure 2).
Voltage Reference and Output Circuitry
VOUT
VIN
IOUT
VOUT
VIN
Load
Dump
Short
Circuit
Thermal
Shutdown
> 30V
Figure 1. Composite Output Stage of the CS8121
Circuit Description
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
0
0.1
-40
°C
25
°C
125
°C
VIN = 14V
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
IOUT
1.0
Quiescent Current vs. Output Current Over Temperature
22.0
20.0
16.0
12.0
8.0
4.0
0.0
10.0
8.0
6.0
4.0
2.0
0.0
0.0
1.0
2.0
3.0
4.0
5.0
5.5
Supply Voltage
VOUT
IQ
Output Voltage and Supply Current vs. Input Voltage
2000
1800
1600
1400
1200
1000
800
600
400
200
0
1
5
10
15
20
25
30
35
40
VIN = 5V
Reset Output Current (mA)
RESET Output Voltage vs. Output Current
Figure 2. Typical Circuit Waveforms for Output Stage Protection.


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