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LM217LD13TR Folha de dados(PDF) 9 Page - STMicroelectronics

Nome de Peças LM217LD13TR
Descrição Electrónicos  Low current 1.2 to 37 V adjustable voltage regulators
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
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LM217LD13TR Folha de dados(HTML) 9 Page - STMicroelectronics

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DocID2168 Rev 5
9/23
LM217L, LM317L
Application information
23
6
Application information
The LM317L provides an internal reference voltage of 1.25 V between the output and
adjustments terminals. This is used to set a constant current flow across an external resistor
divider (see Figure 6.), 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 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 regulator
as the maximum input-to-output differential is not exceeded. Furthermore, programmable
regulators 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 Figure 6.) 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.


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