LM317L(2003) 查看數據表（PDF） - STMicroelectronics
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LM317L Datasheet PDF : 10 Pages
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LM217L/LM317L
Figure 1 : Current Limit
Figure 2 : Minimum Operating Current
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 3 : Basic Adjustable Regulator
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