SMLM317L datasheet(3/3 Pages) SECOS

3 / 3 page

01-Jun-2002 Rev. A

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3 of 3

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Elektronische Bauelemente

SMLM317L

100mA Adjustable

Voltage Regulator

Fig 1. Basic Adjustable Regulator

Fig 2. Voltage Regulator with

Protection Diodes

Fig 3. Slow Turn-On 15V Regulator

Fig 4. 5V Electronic Shut-Down

Regulator

SMLM317L

2,3,6,7

SMLM317L

2,3,

6,7

SMLM317L

2,3,6,7

SMLM317L

2,3,6,7

Application Information and Circuits

The SMLM317L 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 driver, giving an output voltage VOUT of: VOUT=VREF*(1+R2/R1)+IADJ*R2.

The device is designed to min. the term IADJ (100uA max) and to maintain it very constant with line and load charges. 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 min. load current condition. If the load is insufficient, the output voltage will rise. The SMLM317L

is a floating regulator, input-output differential voltage,supplies of very high voltage with respect to ground can be regulated as

long as the max. input-output differential is not exceeded. Furthemore, 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.

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