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    首頁產(chǎn)品索引LR745

    LR745

    購買收藏
    SWITCHMODE POWER SUPPLY START-UP IC

     

    產(chǎn)品信息

    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 18.0V. 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.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 to 450V

      Output current limiting

      For PWM ICs with start-up threshold voltage of 13.9 - 18.0V

      Very low power consumption after start-up

    電路圖、引腳圖和封裝圖

    在線購買

    型號制造商描述購買
    LR745N3-G-P003ON/Fairchild 立即購買
    LR745N3-G-P013YXC 立即購買
    LR745N8-G-- 立即購買
    LR745N3-G-- 立即購買

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