IP137A SERIES LM137A SERIES
IP137A SERIES LM137A SERIES
IP337A SERIES
IP337A SERIES
APPLICATIONS INFORMATION
High Stability Regulator
Multiple Tracking Regulators
The output stability, load regulation, 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 has 20PPM/°C maximum
drift and about 10 times lower noise than the regulator.
In the application shown below, regulator #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 -2V. Load regulation of regulators 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.
R 2 *
7V
C 3
1 0µF
2µF
R 2
C 1
1µF
R 3
R 1
1 k
1µF
1.5k
SOLID
TANTALUM
SOLID
TANTALUM
1
%
1
%
1N4 002
R 1
120
ADJ
Ω
ADJ
VIN
V
OUT
V
V
OUT
IN
–VIN
–VOUT1
REG #1
–V
IN
–VOUT
(VOUT
9.08 x 10 -3
)
* R2 =
– 908 Ω
IP137A
IP337A
1µF
SOLID
TANTALUM
IP317A
V
2µF
1N4 002
ADJ
V
V
IN
OUT
VIN
OUT
+VIN
+VOUT
–VOUT2
REG #2
A D J
IP137A
R1**
100
1 %
Ω
D 1
1N40 02
2. 2
µ
F
1µF
R 2
5 k
1 %
SOLID
2µF
TANTALUM
1N4 002
1 0
1 0
µ
µ
F
ADJ
V
VIN
R 3
5 k
OUT
–VOUT
N
REG #N
R 4
5 k
1 %
F
IP137A
2. 2
R5**
µ
F
100
1 %
Ω
D 2
1N40 02
C 1
1µF
A D J
SOLID
TANATALUM
V
V
IN
OUT
ADJ
–VIN
–VOUT
V
V
OUT
IN
I
(–)
(+)
RS
IP337A
1.25 V
I = 65µA +
IP337A
RS
* Solid Tantalum
** R1 or R5 may be trimmed slightly to improve tracking.
0.8 Ω ≤ RS
≤
250Ω
Dual Tracking Supply
Current Regulator
Order Information
IG–Pack
G–Pack
(TO257) SMD1 SMD05 LCC4
Part
Number
K–Pack R–Pack T–Pack
Temp.
Range
(TO3)
(TO66) (TO220)
LM137
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
-55 to +150°C
LM137HV
LM137A
LM137AHV
IP137
IP137HV
IP137A
IP137AHV
LM337
LM337HV
IP337
”
”
”
“
”
”
”
0 to 125°C
”
”
”
”
”
IP337HV
IP337A
IP337AHV
Semelab Plc reserves the right to change test conditions, parameter limits and package dimensions without notice. Information furnished by Semelab is believed
to be both accurate and reliable at the time of going to press. However Semelab assumes no responsibility for any errors or omissions discovered in its use.
Semelab encourages customers to verify that datasheets are current before placing orders.
Semelab plc. Telephone +44(0)1455 556565. Fax +44(0)1455 552612.
Document Number 2831
Issue 3
E-mail: sales@semelab.co.uk
Website: http://www.semelab.co.uk
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