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CS8101YDR8G Folha de dados(PDF) 7 Page - ON Semiconductor

Nome de Peças CS8101YDR8G
Descrição Electrónicos  Micropower 5.0 V, 100 mA Low Dropout Linear Regulator with RESET and ENABLE
Download  13 Pages
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Fabricante Electrônico  ONSEMI [ON Semiconductor]
Página de início  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

CS8101YDR8G Folha de dados(HTML) 7 Page - ON Semiconductor

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CS8101
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7
APPLICATION NOTES
VBAT
SWITCH
Q1
500 k
W
0.1
mF
500 k
W
100 k
W
100 k
W
CRST
COUT
RRST
VCC
RESET
I/O Port
mP
VOUT
RESET
ENABLE
VIN
Figure 6. Microprocessor Control of CS8101 Using External Switching Transistor Q1
CS8101
GND
The ENABLE pin of the CS8101 can be tied to the battery
voltage provided a series resistor is used as shown in Figure 7.
The maximum allowed voltage on the ENABLE pin without
the resistor is 10 V. Direct voltages greater than 10 V applied
to the pin without the series resistor may damage the device.
The system designer should note the turn−on threshold (typ
1.4 V) is on the ENABLE pin. The threshold will be higher
on the other side of RENABLE.
VBAT
Figure 7. Using the ENABLE pin with VBAT
60 k
ENABLE
RENABLE
0.64 V
ON/OFF
Control
10 k
50 k
STABILITY CONSIDERATIONS
The output or compensation capacitor helps determine
three main characteristics of a linear regulator: start−up
delay, load transient response and loop stability.
VIN
Figure 8. Test and Application Circuit Showing
Output Compensation
CIN*
0.1
mF
ENABLE
VOUT
RRST
COUT**
10
mF
RESET
CS8101
*CIN required if regulator is located far from the power supply filter.
*COUT required for stability. Capacitor must operate at
minimum temperature expected.
The capacitor value and type should be based on cost,
availability, size and temperature constraints. A tantalum or
aluminum electrolytic capacitor is best, since a film or
ceramic capacitor with almost zero ESR can cause
instability. The aluminum electrolytic capacitor is the least
expensive solution, but, if the circuit operates at low
temperatures (−25
°C to −40°C), both the value and ESR of
the capacitor will vary considerably. The capacitor
manufacturers data sheet usually provides this information.
The value for the output capacitor COUT shown in Figure 8
should work for most applications, however it is not
necessarily the optimized solution.


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