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LM317P датащи(PDF) 4 Page - STMicroelectronics

номер детали LM317P
подробное описание детали  1.2V TO 37V VOLTAGE REGULATOR
Download  11 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
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LM317P датащи(HTML) 4 Page - STMicroelectronics

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APPLICATION INFORMATION
The
LM117/217/317
provides
an
internal
reference voltage of 1.25V between the output
and adjustments terminals. This is used to set a
constant current flow across an external resistor
divider (see fig. 4), giving an output voltage VO of:
VO =VREF
(1 +
R2
R1
) +IADJ R2
The device was designed to minimize the term
IADJ (100
µA max) and to maintain it very constant
with line and load changes. Usually, the error
term IADJ
⋅ R2 can be neglected. To obtain the
previous requirement, all the regulator quiescent
current is returned to
the output terminal,
imposing a minimum load current condition. If the
load is insufficient, the output voltage will rise.
Since the LM117/217317 is a floating regulator
and ”sees” only the input-to-output differential
voltage, supplies of very high voltage with respect
to ground can be regulated as long as the
maximum
input-to-output
differential
is
not
exceeded. Furthermore, programmable regulator
are easily obtainable and, by connecting a fixed
resistor between the adjustment and output, the
device can be used as a precision current
regulator.
In order to optimise the load regulation, the
current set resistor R1 (see fig. 4) should be tied
as close as possible to the regulator, while the
ground terminal of R2 should be near the ground
of the load to provide remote ground sensing.
Performance may be improved with added
capacitance as follow:
An input bypass capacitor of 0.1
µF
An adjustment terminal to ground 10
µF capacitor
Figure 4 : Basic Adjustable Regulator.
Figure 1 : Output Current vs. Input-output
Differential Voltage.
Figure 2 : Dropout Voltage vs. Junction
Temperature.
Figure 3 : Reference Voltage vs. Junction
LM117/217/317
4/11


Аналогичный номер детали - LM317P

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