Supertex Inc LR745
LR745 is a high input voltage SMPS startup circuit. The LR745 is ideally suited for use with industry standard low voltage PWM ICs having start thresholds of 13.9 - 18.0V. It allows the PWM ICs to be operated from rectified 120 or 240VAC lines, and eliminates the use of power resistors often used for this purpose.| Part No. | LR745 |
|---|---|
| Datasheet | LR745 Download |
| Manufacturer |  Supertex Inc |
| Description | High Input Voltage SMPS Start-up |
| Buy | Stock & Price |
FEATURES
► Accepts inputs from 35V to 450V ► Output current limiting ► For PWM ICs with start-up threshold voltage of 13.9 - 18.0V ► Very low power consumption after start-upAPPLICATIONS
► Notebook and laptop computers ► Telecommunication power supplies ► Battery chargers ► Motor controllersGENERAL DESCRIPTION
The Supertex 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
