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LM336 Folha de dados(PDF) 4 Page - STMicroelectronics

Nome de Peças LM336
Descrição Electrónicos  2.5V VOLTAGE REFERENCES
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

LM336 Folha de dados(HTML) 4 Page - STMicroelectronics

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APPLICATION HINTS
The LM236, LM336 voltage references are easier to
use than zener diodes. Their low impedance and
wide current range facilitate biasing in any circuits.
Besides, the breakdown voltage or the temperature
coefficient can be adjusted so as to optimize the per-
formance of the circuit.
Figure 1 represents a LM336 with a 10k
Ω potenti-
ometer to adjust the reverse breakdown voltage can
be adjusted without altering the temperature coeffi-
cient of the circuit. The adjustment range is gener-
ally sufficient to adjust the initial tolerance of the cir-
cuit and the inaccuracy of the amplifier circuit.
To obtain a lower temperature coefficient two diodes
can be connected in series as indicated in Figure 2.
When the circuit is adjusted to 2.49V the tempera-
ture coefficient is minimized.
For a correct temperature coefficient, the diodes
should be at the same ambient temperature as the
LM336. The value of R1 is not critical (2-20k
Ω).
R1
10k
LM336
V
R
S
Figure 1 : The LM336 with Pot for Adjustment of
Breakdown Voltage
R1
10k
LM336
V
R
S
1N4148
1N4148
Figure 2 : Temperature Coefficient Adjustment
LM236 - LM336,B
4/9


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