厂商：Freescale
类别：16位单片机
厂商：
类别：PhotoMOS(MOSFET输出光电耦合器)
类别：功率继电器
厂商：Linear
类别：电压基准
类别：监控电路
我要询价我要收藏
特点PFC and PWM Single Chip SolutionSynchronized Operation up to 300kHz99% Power Factor over 20:1 Load Current RangeCurrent Mode PWMInstantaneous Overvoltage ProtectionDedicated Overvoltage Protection (OVP Pin)Minimal Line Current Dead ZoneTypical 250μA Start-Up Supply CurrentLine Switching Noise FilterLow Quiescent Current: 13mAFast 2A Peak Current Gate DriversSeparate Soft Start Controls典型应用描述描述 The LT?1509 is a complete solution for universal off-line switching power supplies utilizing active power factor correction. The PFC section is identical to the LT1248 PFC controller except the EN/SYNC pin is removed because PFC and PWM are synchronized internally. The current mode PWM section (the LT1508 is the volt-age-mode counterpart) contains all the primary side functions to convert the PFC preregulated high voltage output to an isolated low voltage output. The PWM duty cycle is internally limited to 47% (maximum 50%) to prevent transformer saturation. PWM soft start begins when PFC output reaches the preset voltage. In the event of brief line loss,the PWM will be shut off when the PFC output voltage drops below 73% of the preset value.