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.
Regulation is measured at constant junction temperature, using pulse testing at a low duty cycle. Changes in output voltage due to heating effects are covered under
thermal regulation specifications. Load regulation is measured at a point 1/8” from the bottom of the package for the TO–3 and TO–66 packages, at the junction of the
wide and narrow portion of the output lead for the SMD packages, and 1/8” below the base of the package on the output pin of the TO–257 package.
2) Test Conditions unless otherwise stated: VIN – VOUT = 5V , IOUT = 0.5A , PMAX = 20W , IMAX = 1.5A, VMAX = 40V for standard series , 50V for HV series.
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.
Regulation is measured at constant junction temperature, using pulse testing at a low duty cycle. Changes in output voltage due to heating effects are covered under
thermal regulation specifications. Load regulation is measured at a point 1/8” from the bottom of the package for the TO–3 and TO–66 packages, at the junction of the
wide and narrow portion of the output lead for the SMD packages, and 1/8” below the base of the package on the output pin of the TO–257 package.
VMAX = 40V for standard series , 50V for HV series.
2) Test Conditions unless otherwise stated:
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.
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.
LM137A SERIES
LM137A SERIES
Multiple Tracking Regulators
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 V
OUT
/ 1.25V compared to a standard regulator,
so regulator #1 should be the one which has the lowest load
current.
2
µF
C3
1 0µF
R2
C1
1µF
SO LID
TAN TALU M
R 2
*
7V
R3
1 .5 k
1%
R1
1k
1%
1
µ
F
SO LID
TANT ALUM
AD J
V
IN
–V
IN
V
OU T
R EG #1
1 N4 0 0 2
AD J
V
IN
–V
IN
V
OU T
R1
1 20
Ω
–V
O U T1
* R2 =
IP337A
IP3 17A
V
IN
+V
IN
ADJ
V
OU T
( V
O U T
)
– 908
Ω
9.08 x 10
-3
–V
O U T
IP137A
2
µ
F
AD J
V
IN
V
OU T
R EG #2
1 N4 0 0 2
1µF
SO LID
TANTA LU M
+V
O U T
–V
O U T2
IP137A
R1* *
1 00
Ω
1%
2. 2
µF
D1
1N40 02
1µF
SO LID
TANTA LU M
1 0
µ
F
R2
5k
1%
2
µF
AD J
1 N4 0 0 2
R3
5k
V
IN
V
OU T
R EG #N
–V
O UT N
1 0
µ
F
R4
5k
1%
2. 2
µF
D2
1N40 02
I P 13 7 A
R5* *
1 00
Ω
1%
ADJ
V
IN
–V
IN
V
OU T
–V
O U T
C1
1
µF
AD J
(–)
V
IN
V
OU T
SO LID
TANA TALU M
IP3 37A
IP337A
* Solid Tantalum
** R1 or R5 may be trimmed slightly to improve tracking.
R
S
I = 65µA +
1.25 V
R
S
0.8
Ω ≤
R
S
≤
250Ω
I
(+)
Dual Tracking Supply
Current Regulator
Order Information
Part
Number
LM137
LM137HV
LM137A
LM137AHV
IP137
IP137HV
IP137A
IP137AHV
LM337
LM337HV
IP337
IP337HV
IP337A
IP337AHV
IG–Pack
G–Pack
(TO257) SMD1 SMD05 LCC4
K–Pack R–Pack T–Pack
(TO3)
(TO66) (TO220)
Temp.
Range
-55 to +150°C
”
”
”
“
”
”
”
0 to 125°C
”
”
”
”
”
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.
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