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LR645 Datasheet(PDF) 1 Page - Supertex, Inc |
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LR645 Datasheet(HTML) 1 Page - Supertex, Inc |
1 / 9 page LR645 Features Accepts inputs from 15V 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 8.0V 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 ► ► ► ► ► ► ► ► ► General Description The Supertex LR645 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 an 8- lead 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. The adjustable voltage version allows trimming of the output voltage from 8.0V to 12V. This version can also be connected to an external depletion mode MOSFET for increased output current. When used in conjunction with Supertex depletion mode MOSFET DN2540N5, an output current of up to 150mA is achieved. Block Diagram High Input Voltage SMPS Start-up / Linear Regulator V OUT GND GATE V IN TRIM + – LR645 Caution! The LR645 does NOT provide galvanic isolation. When operated from an AC line, potentially lethal voltages can be present on the IC. Adequate means of protecting the end user from such voltages must be provided by the circuit developer. |
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