CS8120 Просмотр технического описания (PDF) - Cherry semiconductor
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CS8120 Datasheet PDF : 8 Pages
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Typical Performance Characteristics: continued
Quiescent Current vs. Output Current Over Temperature
Output Voltage and Supply Current vs. Input Voltage
3.5
VIN = 14V
3.0
-40°C
2.5
25°C
2.0
125°C
1.5
1.0
0.5
0.0
0
50
100
150
200
250
300
350
Output Current (mA)
5.5
5.0
4.0
3.0
2.0
1.0
0.0
0.0
VOUT
22.0
20.0
16.0
12.0
IQ
8.0
4.0
0.0
2.0
4.0
6.0
8.0
10.0
Supply Voltage (V)
RESET Output Voltage vs. Output Current
2000
1800
1600
1400
1200
1000
800
600
400
200
0
1
VIN = 5V
5
10
15
20
25
30
35
40
Reset Output Current (mA)
Circuit Description
Voltage Reference and Output Circuitry
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
variation.
The NPN pass device prevents deep saturation of the out-
put stage which in turn improves the ICÕs efficiency by
preventing 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).
> 30V
Output Stage
VIN
The composite PNP-
NPN output structure
(Figure 1) provides
300mA (typ) of output
current while maintain-
ing a low drop out volt-
age (1.00V, typ) and
drawing little quiescent
current (2.5mA).
VOUT
Figure 1: Composite Output Stage of the CS8120
VIN
VOUT
IOUT
Load
Dump
Short
Circuit
Thermal
Shutdown
Figure 2: Typical Circuit Waveforms for Output Stage Protection.
4
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