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參數(shù)資料
| 型號(hào)： | LM317L |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | Low Current 1.2V to 37V Adjustable Voltage Regulator(低電流1.2V~37V可調(diào)電壓穩(wěn)壓器) |
| 中文描述： | 低電流為1.2V到37V可調(diào)穩(wěn)壓器（低電流為1.2V?片山可調(diào)電壓穩(wěn)壓器） |
| 文件頁(yè)數(shù)： | 4/8頁(yè) |
| 文件大小： | 130K |
| 代理商： | LM317L |
Current Limit
Minimum Operating Current
APPLICATION INFORMATION
The LM317L provides an internal reference voltage
of 1.25V between the output and adjustments ter-
minals. This is used to set a constant current flow
acrossan external resistor divider (see fig.4),giving
an output voltage VO of:
V
O
= V
REF
(
1
+
R
2
R
1
)
+ I
ADJ
R
2
The device was designed to minimize the term I
ADJ
(100
μ
A 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 totheoutputterminal,imposing aminimum
load current condition. If theload isinsufficient, the
output voltage will rise.
Since the LM317L is a floating regulator and ”sees”
onlytheinput-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, program-
mable regulator are easily obtainable and, by con-
necting a fixed resistor between theadjustment and
output,thedevice canbeusedasaprecision 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 ter-
minal of R2 should be near the ground of the load
to provide remote groundsensing.
Figure 4 :
Basic Adjustable Regulator.
LM317L
LM217L/LM317L
4/8
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