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LM317LZ Arkusz danych(PDF) 5 Page - STMicroelectronics

Numer części LM317LZ
Szczegółowy opis  LOW CURRENT 1.2 TO 37V ADJUSTABLE VOLTAGE REGULATOR
Download  13 Pages
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Producent  STMICROELECTRONICS [STMicroelectronics]
Strona internetowa  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

LM317LZ Arkusz danych(HTML) 5 Page - STMicroelectronics

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APPLICATION INFORMATION
The LM317L 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 (100µA 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 LM317L 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 optimize 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.
Figure 6: Basic Adjustable Regulator
Figure 7: Voltage Regulator with Protection Diodes


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