LT1033 - 3A. Negative Adjustable Regulator - Linear Technology
LT1033 - 3A. Negative Adjustable Regulator - Linear Technology
LT1033 - 3A. Negative Adjustable Regulator - Linear Technology
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<strong>LT1033</strong><br />
TYPICAL APPLICATIO S<br />
The output stability, load regulation, line regulation,<br />
thermal regulation, temperature drift, long term drift, and<br />
noise can be improved by a factor of 6.6 over the standard<br />
regulator configuration. This assumes a zener whose drift<br />
and noise is considerably better than the regulator itself.<br />
The LM329B has 20ppm/°C maximum drift and about 10<br />
times lower noise than the regulator.<br />
In the application shown below, regulators #2 to “N” will<br />
track regulator #1 to within ±24mV initially, and to ±60mV<br />
over all load, line, and temperature conditions. If any<br />
regulator output is shorted to ground, all other outputs will<br />
drop to ≈ –2V. Load regulation of regulators #2 to “N” will<br />
be improved by V OUT /1.25V compared to a standard<br />
regulator, so regulator #1 should be the one which has the<br />
lowest load current.<br />
Multiple Tracking <strong>Regulator</strong>s<br />
C1<br />
2µF<br />
–V IN V IN REG #1 V OUT<br />
–V OUT1<br />
2µF<br />
1N4002 R1 SOLID<br />
ADJ<br />
120Ω TANTALUM<br />
2µF<br />
V IN<br />
<strong>LT1033</strong><br />
ADJ<br />
REG #2 V OUT<br />
<strong>LT1033</strong><br />
C3<br />
10µF<br />
1N4002<br />
+<br />
+<br />
R2<br />
+<br />
+<br />
U<br />
2µF<br />
SOLID<br />
TANTALUM<br />
–V OUT2<br />
+<br />
ADJ<br />
High Stability <strong>Regulator</strong><br />
7V<br />
LM329B<br />
R3<br />
1.5k<br />
1%<br />
R2*<br />
R1<br />
1k<br />
1%<br />
–V IN V IN V OUT –V OUT<br />
<strong>LT1033</strong><br />
|V OUT |<br />
*R2 = – 908Ω<br />
9.08 • 10 –3<br />
<strong>LT1033</strong> • TA06<br />
Dual Tracking <strong>3A</strong> Supply ± 1.25V to ± 20V<br />
1µF<br />
SOLID<br />
TANTALUM<br />
V IN V OUT<br />
+<br />
LT150A<br />
+V IN<br />
+V OUT<br />
ADJ<br />
R1**<br />
100Ω<br />
1% 2.2µF* D1<br />
–V IN V IN V OUT<br />
–V OUT<br />
1N4002<br />
+ R2<br />
10µF 5k<br />
1%<br />
R3<br />
5k<br />
+ R4<br />
10µF 5k<br />
1%<br />
R5** +<br />
2.2µF* D2<br />
100Ω<br />
1N4002<br />
1%<br />
ADJ<br />
<strong>LT1033</strong><br />
<strong>LT1033</strong> • TA07<br />
*SOLID TANTALUM<br />
**R1 OR R5 MAY BE TRIMMED SLIGHTLY TO IMPROVE TRACKING<br />
+<br />
2µF<br />
V IN V OUT<br />
2µF<br />
ADJ<br />
SOLID<br />
TANTALUM<br />
REG #N<br />
–V OUT3<br />
<strong>LT1033</strong><br />
<strong>LT1033</strong> • TA05<br />
+<br />
Current <strong>Regulator</strong><br />
(–)<br />
ADJ<br />
<strong>LT1033</strong><br />
+<br />
C1<br />
2µF<br />
SOLID TANTALUM<br />
V IN V OUT<br />
<strong>LT1033</strong> • TA08<br />
R S I<br />
(+)<br />
1.25V<br />
(O.5Ω ≤ R S ≤ 250Ω) I = 65µA +<br />
R S<br />
1033fc<br />
7
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