SLLM317L datasheet(3/3 Pages) SECOS

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01-Jun-2002 Rev. A

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Elektronische Bauelemente

SLLM317L

100mA Adjustable

Voltage Regulator

Application Information and Circuits

The SLLM317L 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 minimize 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 minimum load current condition. If the load is

insufficient, the output voltage will rise. The SLLM317L is a floating regulator, input-output differential voltage,

supplies of very high voltage with respect to ground can be regulated as long as the maximum input-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.

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 S

LLM317L

SLLM317L Datasheet(PDF) 3 Page - SeCoS Halbleitertechnologie GmbH