LR12N3-G

Features

➢ 13.2 to 100V input voltage range

➢ Stable with 100nF output capacitor

➢ Adjustable 1.20 to 88V output regulation

➢ 5% reference voltage tolerance

➢ Output current limiting, 50mA min.

➢ 10μA typical ADJ current

➢ Over temperature protection

➢ Available in 3 different packages

Applications

➢ DC/DC SMPS startup circuits

➢ Adjustable high voltage constant current sources

➢ Industrial controls

➢ Motor controls

➢ Battery powered systems

➢ Power supplies

➢ Telecom applications

➢ LED drivers

➢ Automotive applications

General Description

The Supertex LR12 is a high voltage, low output current, adjustable linear regulator. Ithas a wide operating input voltage range of 13.2 - 100V. The output voltage can be adjusted from 1.20- 88V, provided that the input voltage is atleast 12V greater than the output voltage. The output voltage can be adjusted by means of two extemal resistors R, and R, as shown in the typical application circuits. The LR12 regulates the voltage difference between VOUT and ADJ pins to a nominal value of 1.20V. The 1.20V is amplified by the extemal resistor ratio R, and R. An internal constant bias current of typically 10μA is connected to the ADJ pin. This increases Vour by a constant voltage of 10μA times R2.

The LR12 has current limiting and temperature limiting. The output current limit is 100mA maximum and the minimum temperature limit is 125°C. An output short circuit current will therefore be limited to 100mA maximum. When the junction temperature reaches its temperature limit, the output current and/or output voltage will decrease to keep the junction temperature from exceeding its temperature limit. For SMPS start-up circuit applications, the LR12 turns off when an extermal voltage greater than the output voltage of the LR12 is applied to VOUT of the LR12. To maintain stability, a bypass capacitor of 100nF or larger and a minimum DC output current of 500μA are required.

LR12 Typical Application

Ordering Information

Pin Configuration

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