IP137SMD05_10 Datasheet, PDF (4/5 Pages) Seme LAB – NEGATIVE ADJUSTABLE VOLTAGE REGULATOR

NEGATIVE ADJUSTABLE
VOLTAGE REGULATOR
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.
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 ^VOUT / 1.25V compared to a
standard, so regulator #1 should be the one which has
the lowest load current.
–V _IN
R2*
7V
R3
R1
1.5k
1k
1%
1%
ADJ
V_IN
V_OUT
IP_IP1₁3₃7₇
* R2 =
( V_OUT )
9.08 x 10 ^-3
– 908 Ω
SOLID
TANTALUM
1µF
–V _OUT
Dual Tracking Supply
I_IP_P1₁3₃7₇
+V _IN
V_IN
V _OUT
ADJ
+V
OUT
R1**
100 Ω
1%
2.2*
µF
D1
1N4002
–V _IN
R2
10µF
5k
1%
R4
10µF
5k
1%
ADJ
V_IN
V _OUT
R3
5k
R5**
100 Ω
1%
2.2*
µF
D2
1N4002
–V_OUT
I_IPP₁13₃7₇
* Solid Tantalum
** R1 & R5 maybe trimmed slightly to improve tracking
–VIN
2µF
ADJ
V_IN
V _OUT
REG #1
I_IP_P1₁3₃7₇
1N4002
C3
10µF
R2
R1
120 Ω
C1
1µF
SOLID
TANTALUM
–V_OUT1
2µF
V_IN
ADJ
V_OUT
REG #2
IIPP113377
1N4002
1µF
SOLID
TANTALUM
–VOUT2
2µF
V _IN
ADJ
V _OUT
REG #N
I_IP_P1₁3₃7₇
1N4002
1µF
SOLID
TANTALUM
–VOUT N
Current Regulator
C1
1µF
SOLID
ADJ
TANATALUM
(–)
V _IN
V _OUT
I
(+)
R_S
IPP11377
1.25 V
I = 65µA +
R_S
0.8 Ω ≤ R_S ≤ 250Ω
Semelab Limited
Coventry Road, Lutterworth, Leicestershire, LE17 4JB
Telephone [phone] Fax [phone] Email: [e-mail]
Document Number 8377
Website: http://www.semelab-tt.com
Issue 2
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