CS8147
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 voltage is dependent upon load
current and junction temperature.
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.
Input Output Differential:
The voltage difference between the
unregulated input voltage and the regulated output
voltage for which the regulator will operate.
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.
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 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.
Quiescent Current:
The part of the positive input current that
does not contribute to the positive load current. 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 V
OUT
:
The percentage change in out-
put voltage for a thermal variation from room tempera-
ture to either temperature extreme.
Typical Circuit Waveform
60V
V
IN
14V
31V
5V
26V
14V
ENABLE
2.0V
0.8V
10V
10V
5V
10V
0V
0V
5V
5V
3V
0V
0V
5V
5V
0V
5V
0V
10V
0V
0V
10V
V
OUT1
V
OUT2
System
Condition
Turn
On
Load
Dump
Low V
IN
Line Noise, Etc.
V
OUT
Short
Circuit
Thermal
Shutdown
Turn
Off
Test & Applications Circuit
C
1
*
0.1
mF
DISPLAY
V
IN
V
OUT
1
10V
C
2
**
10mF
CS8147
Control
ENABLE
Gnd
V
OUT
2
5V
Tuner IC
* C
1
is required if the regulator is located away from the power source filter.
**C
2
is required for stability.
5
CHERRY [ CHERRY SEMICONDUCTOR CORPORATION ]
