LD7841Q中文资料Single-Stage, High Power Factor, Constant Voltage Output Controller Primary-Side Regulation with Integrated High Voltage Startup数据手册Leadtrend规格书

描述 Description

The LD7841Q is a voltage mode controller for constant voltage output to LED drivers. Designed to support flyback or buck-boost topologies, its proprietary voltage mode control algorithm provides near−unity power factor and tightly regulates a constant output voltage from the primary side, thus eliminating the need for a secondary side feedback circuitry or an optical coupler.The device is highly integrated with a minimum number of external components. A robust suite of safety protection is built in to simplify the design. This device is specifically intended for very compact space efficient designs and also provides a constant voltage regulation of the output if no load is connected to the LED drivers.

特性 Features

• Wide universal input range (85VAC ~ 305 VAC)
• Fast Startup time: ≦ 0.5 sec
• Low standby power-No load power saving : < 0.3W-Standby power consumption: < 0.5W
• Precise voltage regulation in the steady state : < ± 3 %
• Voltage regulation in the load transient: < ± 15%
• Total harmonic distortion current (THDi) optimization: <10%
• High Power Factor : PF > 0.9
• Robust Protection Features- Brown−In/Out Detection on HV pin- Cycle−by−cycle Peak Current Limit on CS pin- Over Load Protection on COMP pin- Secondary Diode short Protection on CS pin- Pin Short/Open Circuit Protection on CS and FB pin- Output Short Circuit Protection on FB pin- External OTP on CS pin- Internal Over Temperature Protection
• 250 mA / -700 mA Totem Pole Driving capability

应用 Application

• LED Driver Power Supplies
• Offline Appliances Requiring Power Factor Correction