General Description
The Supertex LR6 is a high input voltage, low output current linear regulator. It has a 3-terminal fixed output voltage version available in TO-92, TO-220 and SOT-89 packages as well as an adjustable voltage version available in 8 pin SOIC package. The 3-terminal version functions like any other low voltage 3-terminal regulator except it allows the use of much higher input voltages. When used in a SMPS start-up circuit, it eliminates the need for large power resistors. In this application, current is drawn from the high voltage line only during start-up. Only leakage current flows after start-up thereby reducing the continuous power dissipation to a few milliwatts.

FEATUREs
❏ Accepts inputs from 15V to 450V
❏ Compatible with industry standard PWM ICs. See application note AN-H28.
❏ Output currents up to 3mA continuous, 30mA peak
❏ Supply current typically 50µA
❏ Line regulation typically 0.1mV/V
❏ Output can be trimmed from 8.0V to 12V
❏ Output current can be increased to 150mA with external FET

APPLICATIONs
❏ Off-line SMPS startup circuits (pulse loads)
❏ Low power off-line regulators
❏ Regulators for noisy inputs