LM138/LM338
Typical Performance Characteristics
Minimum Operating
Current
(Continued)
Ripple Rejection
00906040
00906041
Ripple Rejection
Ripple Rejection
00906042
00906043
Line Transient Response
Load Transient Response
00906044
00906045
Application Hints
In operation, the LM138 develops a nominal 1.25V reference
voltage, V
REF
, between the output and adjustment terminal.
The reference voltage is impressed across program resistor
R1 and, since the voltage is constant, a constant current I
1
then flows through the output set resistor R2, giving an
output voltage of
5
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