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reichelt elektronik GmbH & Co. KG
Elektronikring 1
26452 Sande Germany

phone: +49 (0)4422 955-333

LR745N3-G :: SMPS, high voltage, 35 - 450 V, TO-92

Item-No.: LR745N3-G
Category of goods: 1 = discountable


LR745 is a high input voltage SMPS start-up circuit. The LR745 is ideally suited for use with industry standard low-voltage PWM ICs having start thresholds of 13.9 to 18.0 V. It allows the PWM ICs to be operated from rectified 120 or 240 V AC lines, and eliminates the use of power resistors often used for this purpose. The internal circuitry of the LR745 allows the PWM ICs to operate at a VCC voltage below their start threshold voltage after start-up. The auxiliary voltage can be less than the start threshold voltage, which allows for improved efficiency. Current from the high-voltage line is drawn only during the start-up period. After start-up, the internal high-voltage line is disconnected from the IC, thereby reducing the continuous power dissipation to a minimum.

• Accepts inputs from 35 - 450 V
• Output current limiting
• For PWM ICs with start-up threshold voltage of 13.9 - 18 V
• Very low power consumption after start-up

Technical data:
• Input voltage: 25 - 450 V
• Output voltage: 13.9 - 18.0 V
• Output current: 2 mA
• Line regulation: 0.0001 (%/V)
• Load regulation: 0.5 (%/mA)

Manufacturer : MICROCHIP
Factory number : LR745N3-G
Package weight : 0.0001 kg
RoHS : conform
Technical information