IP137A SERIES
IP137A SERIES
IP337A SERIES
IP337A SERIES
APPLICATIONS INFORMATION
High Stability Regulator
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
R3
1 .5 k
1%
R1
1k
1%
1
µ
F
SO LID
TANT ALUM
C3
1 0µF
R2
C1
1µF
SO LID
TAN TALU M
R 2
*
7V
AD J
V
IN
–V
IN
V
OU T
V
IN
AD J
V
OU T
R EG #1
1 N4 0 0 2
R1
1 20
Ω
IP337A
( V
O U T
)
* R2 =
– 908
Ω
9.08 x 10
-3
–V
O U T
–V
IN
–V
O U T1
IP137A
IP3 17A
V
IN
+V
IN
ADJ
R1* *
1 00
Ω
1%
2
µ
F
AD J
V
OU T
+V
O U T
V
IN
V
OU T
R EG #2
1 N4 0 0 2
1µF
SO LID
TANTA LU M
–V
O U T2
IP137A
2. 2
µF
D1
1N40 02
1 0
µ
F
R2
5k
1%
2
µF
R3
5k
AD J
V
IN
V
OU T
R EG #N
1 N4 0 0 2
1µF
SO LID
TANTA LU M
1 0
µ
F
R4
5k
1%
2. 2
µF
D2
1N40 02
–V
O UT N
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
* Solid Tantalum
** R1 or R5 may be trimmed slightly to improve tracking.
R
S
I
(+)
IP337A
I = 65µA +
1.25 V
R
S
0.8
Ω ≤
R
S
≤
250Ω
Dual Tracking Supply
Current Regulator
Order Information
Part
Number
LM137
LM137HV
LM137A
LM137AHV
IP137
IP137HV
IP137A
IP137AHV
LM337
LM337HV
IP337
IP337HV
IP337A
IP337AHV
K–Pack
(TO–3)
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
R–Pack
(TO–66)
✔
✔
✔
✔
✔
✔
✔
✔
IG–Pack
G–Pack
T–Pack
(TO–257) (TO–220)
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
SG–Pack
Temp.
SMD1
Range
✔
-55 to +150°C
✔
”
✔
”
✔
”
✔
-55 to +150°C
✔
”
✔
”
✔
”
0 to 125°C
0 to 125°C
0 to 125°C
”
0 to 125°C
”
Prelim. 7/00
Semelab plc.
Telephone +44(0)1455 556565. Fax +44(0)1455 552612.
E-mail:
sales@semelab.co.uk
Website:
SEME-LAB [ SEME LAB ]
