LR8K4-G

The LR8K4-G is a high-voltage, low-output current, adjustable Linear Regulator. It has a wide operating input voltage range of 13.2 to 450V. The output voltage can be adjusted from 1.2 to 440V provided that the input voltage is at least 12V greater than the output voltage. The output voltage can be adjusted by means of two external resistors R1 and R2 as shown in the typical application circuits. The LR8 regulates the voltage difference between VOUT and ADJ pins to a nominal value of 1.2V. The 1.20V is amplified by the external resistor ratio R1 and R2. An internal constant bias current of typically 10µA is connected to the ADJ pin. This increases VOUT by a constant voltage of 10µA times R2. The LR8 has current limiting and temperature limiting. The output current limit is typically 20mA and the minimum temperature limit is 125°C. An output short circuit current will therefore be limited to 20mA.

• 13.2 to 450V Input voltage range
• 5% Output voltage tolerance
• Output current limiting
• 10µA Typical ADJ current
• Internal junction temperature limiting