NXP SSL1750 75W LED调光驱动方案

NXP 公司的SSL1750 是开关电源(SMPS)控制器,适合用于25W到250W LED驱动应用. SSL1750包括功率因素修正(PFC)控制器和反激控制器.通用输入电压70 V 到 276 V (AC),具有多种保护特性和片内起动电流源.主要用在室内LED照明和户外LED照明如街灯,区域照明如停车场以及隧道照明.本文介绍SSL1750主要特性, 方框图, 典型配置电路以及120V(AC) 75W TRIAC可调光LED驱动器电路图,材料清单和230V (AC) 75W TRIAC可调光LED驱动器电路图和材料清单.
The SSL1750 is a Switched Mode Power Supply (SMPS) controller IC, suitable for driving LED applications from 25 W up to 250 W. For LED power requirements below 25 W the SSL152x family and SSL1623PH are the best choice.
The SSL1750 combines a controller for Power Factor Correction (PFC) and a flyback controller. Its high level of integration allows the design of a cost-effective LED power supply with a very low number of external components.
The special built-in green functions provide high efficiency at all power levels. This applies to quasi-resonant operation at high power levels, quasi-resonant operation with valley skipping, as well as to reduced frequency operation at lower power levels. At low power levels, the PFC switches over to burst mode control to maintain high efficiency. In burst mode, soft-start and soft-stop functions are added to eliminate audible noise.
During low power conditions, the flyback controller switches to frequency reduction mode and limits the peak current to 25 % of its maximum value. This will ensure high efficiency at low power while minimizing audible noise from the transformer.
The proprietary high voltage BCD800 process makes direct start-up possible from the rectified universal mains voltage in an effective and green way. A second low voltage Silicon On Insulator (SOI) IC is used for accurate, high speed protection functions and control.
The SSL1750 enables highly efficient and reliable LED drivers with power requirements of up to 250 W to be designed easily and with the minimum number of external components.<...