LR645N5-G

LR645 High-Input Voltage SMPS, Start-up/Linear Regulator Features Description • 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 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. Applications • Off-line SMPS startup circuits (pulse loads) • Low power off-line regulators • Regulators for noisy inputs 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, 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. WARNING 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.  2015 Microchip Technology Inc. DS20005384A-page 1 LR645 Package Type TRIM NC GATE NC VOUT VIN VOUT GND NC +VIN GND TO-92 8-Lead SOIC GND GND VOUT GND VIN TO-243AA (SOT-89) VOUT +VIN GND TO-220 See Table 2-1 for pin information DS20005384A-page 2  2015 Microchip Technology Inc. LR645 1.0 ELECTRICAL CHARACTERISTICS ABSOLUTE MAXIMUM RATINGS Input Voltage .................................................................................................................................................................................. 450V Output voltage............................................................................................................................................................................... 15.5V Operating and storage temperature ............................................................................................................................. -55°C to +150°C Note: Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only and functional operation of the device at those or any other conditions, above those indicated in the operational listings of this specification, is not implied. Exposure to maximum rating conditions for extended periods may affect device reliability. 1.1 ELECTRICAL SPECIFICATIONS TABLE 1-1: Symbol VOUT ∆VOUT ELECTRICAL CHARACTERISTICS 1 Parameter Min Typ Max Output voltage 9.3 10 10.7 V No load Output voltage over temperature2 9.0 10 11.5 V TJ = - 40 to +125°C, No load - 40 200 mV VIN = 15 to 400V, No load VIN = 50V, IOUT = 0 to 3.0mA Line regulation Load regulation Units Conditions - 150 400 mV 15 - 450 V Input quiescent current - 50 150 µA No Load IOFF VIN off-state leakage current - 0.1 10 µA VAUX ≥ VOUT +1V applied to VOUT pin IAUX Input current to VOUT VIN Operating input voltage range IINQ - - 200 µA VAUX ≥ VOUT +1V applied to VOUT pin 50 60 - dB 120 Hz, No Load voltage2 - 25 - µV 0.01 to 100 KHz IPEAK Output peak current3 - 30 - mA COUT = 10 µF, VIN = 400V VAUX External voltage applied to VOUT - - 13.2 V ∆VOUT/∆VIN Ripple rejection ratio2 en Noise 8-lead, adjustable voltage version only VOUT ∆VOUT 1 2 3 8 - 12 V Load regulation at 8V trim2 - 200 400 mV VIN = 15V, IOUT = 0 to 1.0 mA Load regulation at 12V trim2 - 100 400 mV VIN = 50V, IOUT = 0 to 3.0 mA No load Test Conditions unless otherwise specified: TA = 25°C, VIN = 15V-450V, COUT = 0.01 µF Guaranteed by design Pulse test duration