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首页产品索引LR745

LR745

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SWITCHMODE POWER SUPPLY START-UP IC

 

产品信息

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

电路图、引脚图和封装图

在线购买

型号制造商描述购买
LR745N3-G-P003ON/Fairchild 立即购买
LR745N3-G-P013YXC 立即购买
LR745N8-G-- 立即购买
LR745N3-G-- 立即购买

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