LR645N3-G Linear Voltage Regulator Through Hole

LR645 is a high-input voltage, low-output current, linear regulator that is available in two versions. A 3-terminal, fixed-output voltage version is available in TO-92, TO220, and SOT-89 packages, as well as an adjustable voltage version available in an 8-lead SOIC package. The 3-terminal version of LR645 functions like any other low-voltage, 3-terminal regulator except it allows the use of much higher-input voltages. When used in a Switched-mode Power Supply (SMPS), start-up circuit, LR645 eliminates the need for large power resistors. In this application, the 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. The adjustable-voltage version allows trimming of the output voltage from 8.0 to 12V. This version can also be connected to an external depletion mode metal–oxide– semiconductor field-effect transistor (MOSFET) for increased output current. When used in conjunction with depletion mode MOSFET DN2540N5, an output current of up to 150mA is achieved.

Features:-
• Accepts inputs from 15 to 450V.
• Output currents: up to 3.0mA continuous, 30mA peak.
• Supply current typically 50µA.
• Line regulation typically 0.1mV/V.
• Output can be trimmed from 8.0 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.