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LM336M-2.5 Fiches technique(PDF) 7 Page - Texas Instruments

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No de pièce LM336M-2.5
Description  LM136-2.5/LM236-2.5/LM336-2.5V Reference Diode
Download  14 Pages
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
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LM336M-2.5 Fiches technique(HTML) 7 Page - Texas Instruments

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Typical Performance
Characteristics (Continued)
Temperature Drift
00571527
Application Hints
The LM136 series voltage references are much easier to use
than ordinary zener diodes. Their low impedance and wide
operating current range simplify biasing in almost any circuit.
Further, either the breakdown voltage or the temperature
coefficient can be adjusted to optimize circuit performance.
Figure 1 shows an LM136 with a 10k potentiometer for
adjusting the reverse breakdown voltage. With the addition
of R1 the breakdown voltage can be adjusted without affect-
ing the temperature coefficient of the device. The adjustment
range is usually sufficient to adjust for both the initial device
tolerance and inaccuracies in buffer circuitry.
If minimum temperature coefficient is desired, two diodes
can be added in series with the adjustment potentiometer as
shown in Figure 2. When the device is adjusted to 2.490V
the temperature coefficient is minimized. Almost any silicon
signal diode can be used for this purpose such as a 1N914,
1N4148 or a 1N457. For proper temperature compensation
the diodes should be in the same thermal environment as
the LM136. It is usually sufficient to mount the diodes near
the LM136 on the printed circuit board. The absolute resis-
tance of R1 is not critical and any value from 2k to 20k will
work.
00571528
FIGURE 1. LM136 With Pot for Adjustment
of Breakdown Voltage
(Trim Range = ±120 mV typical)
00571529
FIGURE 2. Temperature Coefficient Adjustment
(Trim Range = ±70 mV typical)
www.national.com
6


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