Definition of Terms
Dropout Voltage: The input-output voltage differential at which
Load Regulation: The change in output voltage for a change in
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.
load current at constant chip temperature.
Long Term Stability: Output voltage stability under accelerated
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.
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.
Quiescent Current: The part of the positive input current that
does not contribute to the positive load current. The
regulator ground lead current.
Input Output Differential: The voltage difference between the
unregulated input voltage and the regulated output
voltage for which the regulator will operate.
Ripple Rejection: The ratio of the peak-to-peak input ripple
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.
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 tempera-
ture to either temperature extreme.
Typical Circuit Waveform
60V
26V
14V
31V
VIN
14V
5V
2.0V
0.8V
ENABLE
10V
5V
10V
5V
10V
10V
5V
10V
5V
5V
0V
0V
0V
0V
0V
VOUT1
0V
0V
5V
VOUT2
3V
0V
System
Condition
Turn
On
Load
Dump
Line Noise, Etc.
VOUT
Short
Thermal
Shutdown
Turn
Off
Low VIN
Circuit
Test & Applications Circuit
C *
1
DISPLAY
0.1 mF
V
IN
10V
V
OUT1
C **
2
10mF
CS8147
Control
ENABLE
5V
V
OUT2
Tuner IC
Gnd
* C1 is required if the regulator is located away from the power source filter.
**C2 is required for stability.
5
CHERRY [ CHERRY SEMICONDUCTOR CORPORATION ]
