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LT137A Datasheet(PDF) 9 Page - Linear Technology

Part # LT137A
Description  Negative Adjustable Regulator
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT137A Datasheet(HTML) 9 Page - Linear Technology

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9
137afb
LT137A/LM137
LT337A/LM337
TYPICAL APPLICATIONS
A high stability regulator is illustrated in the application
circuit shown to the right. The output stability, load regula-
tion, line regulation, thermal regulation, temperature drift,
long term drift, and noise can be improved by a factor of
6.6 over the standard regulator configuration. This assumes
a zener whose drift and noise is considerably better than
the regulator itself. The LM329B has 20ppm/°C maximum
drift and about 10 times lower noise than the regulator.
In the application shown below, regulators #2 to “N” will
track regulator #1 to within ±24mV initially, and to ±60mV
over all load, line, and temperature conditions. If any
regulator output is shorted to ground, all other outputs will
drop to approximately ≈ –2V. Load regulation of regula-
tors 2 to “N” will be improved by VOUT/1.25V compared
to a standard regulator, so regulator #1 should be the one
which has the lowest load current.
Multiple Tracking Regulators
High Stability Regulator
Dual Tracking Supply ±1.25V to ±20V
Current Regulator
LT137A
ADJ
VIN
–VIN
R2*
7V
LM329B
VOUT
–VOUT
137A TA03
R1
1k
1%
R3
1.5k
1%
+
1μF
SOLID
TANTALUM
*R2 =
– 908Ω
|VOUT|
9.08 • 10–3
LT337A
ADJ
VIN
(–)
VOUT
(+)
137A TA05
RS
I
+
C1
1μF
SOLID TANTALUM
I = 65μA +
(0.8Ω < RS < 250Ω)
1.25V
RS
LT337A
ADJ
VIN
–VIN
R3
5k
*SOLID TANTALUM
**R1 OR R5 MAY BE TRIMMED SLIGHTLY TO IMPROVE TRACKING
D2
1N4002
VOUT
–VOUT
137A TA04
R4
5k
1%
R2
5k
1%
R5**
100Ω
1%
LT317A
ADJ
VIN
+VIN
VOUT
+VOUT
+
2.2μF*
+
10μF
+
10μF
R1**
100Ω
1%
D1
1N4002
+
2.2μF*
REG #1
ADJ
VIN
–VIN
R2
VOUT
–VOUT1
137A TA02
R1
120Ω
1N4002
C1
1μF
SOLID
TANTALUM
+
C3
10μF
+
2μF
REG #2
LT137A
LT137A
ADJ
VIN
VOUT
–VOUT2
137A TA02
1N4002
1μF
SOLID
TANTALUM
+
2μF
+
REG #N
LT137A
ADJ
VIN
VOUT
–VOUT3
137A TA02
1μF
SOLID
TANTALUM
+
2μF
+


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