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CS8156 Datasheet(HTML) 6 Page - Cherry Semiconductor Corporation

Part No. CS8156
Description  12V, 5V Low Dropout Dual Regulator with ENABLE
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Maker  CHERRY [Cherry Semiconductor Corporation]
Homepage  http://www.cherrycorp.com/
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CS8156 Datasheet(HTML) 6 Page - Cherry Semiconductor Corporation

  CS8156 Datasheet HTML 6Page - Cherry Semiconductor Corporation  
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6
VIN
ENABLE
VOUT
1
System
Condition
60V
3V
2.4V
12V
0V
Turn
On
Load
Dump
Low VIN
Line Noise, Etc.
VOUT
1
Short
Circuit
VOUT
1
Thermal
Shutdown
Turn
Off
5V
0V
14V
5V
2.0V
0.8V
14V
26V
31V
12V
12V
2.4V
12V
12V
0V
0V
VOUT
2
VOUT
2
Short
Circuit
Typical Circuit Waveform
The output or compensation capacitor helps determine
three main characteristics of a linear regulator: start-up
delay, load transient response and loop stability.
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 instabil-
ity. The aluminum electrolytic capacitor is the cheapest
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 capacitors C2 and C3 shown in
the test and applications circuit should work for most appli-
cations, however it is not necessarily the best solution.
To determine acceptable values for C2 and C3 for a par-
ticular application, start with a tantalum capacitor of the
recommended value and work towards a less expensive
alternative part for each output.
Step 1:
Place the completed circuit with the tantalum
capacitors of the recommended value in an environmental
chamber at the lowest specified operating temperature
and monitor the outputs with an oscilloscope. A decade
box connected in series with capacitor C2will simulate the
higher ESR of an aluminum capacitor. Leave the decade
box outside the chamber, the small resistance added by
the longer leads is negligible.
Step 2:
With the input voltage at its maximum value,
increase the load current slowly from zero to full load on
the output under observation. Look for any oscillations on
the output. If no oscillations are observed, the capacitor is
large enough to ensure a stable design under steady state
conditions.
Stability Considerations
Application Notes
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 volt-
age is dependent upon load current and junction temperature.
Input Voltage
The DC voltage applied to the input terminals with respect
to ground.
Input Output Differential
The voltage difference between the unregulated input volt-
age and the regulated output voltage for which the regulator
will operate.
Line Regulation
The change in output voltage for a change in the input volt-
age. The measurement is made under conditions of low dis-
sipation or by using pulse techniques 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 accelerated life-test condi-
tions after 1000 hours with maximum rated voltage and
junction temperature.
Output Noise Voltages
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 con-
tribute to the positive load current. i.e., 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 output voltage for a thermal varia-
tion from room temperature to either temperature extreme.


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