描述
具有PFC和无辅助绕组的非隔离降压LED控制器

DW8532是一款恒流LED控制器，具有高电流精度，适用于单一
阶段降压功率因数校正LED驱动器。通过直接对输出电流进行采样，可实现高精度的输出电流。临界导通模式操作可降低开关损耗并大幅提高效率。 DW8532直接从输出端供电，不需要辅助绕组。 DW8532具有多重保护功能，大大提高了系统的安全性和可靠性，包括：VCC过压保护，VCC UVLO，短路保护，LED开路保护，逐周期电流限制和过温保护。
应用
- DC / DC或AC / DC LED驱动器应用
- 标牌和装饰LED照明
- 平板显示器的一般照明
- RGB背光
- 通用恒流源
- 灯泡灯
特征
- 没有辅助绕组
- 线路和负载的高电流精度
规
- 高功率因数，低输出电流纹波
- 临界传导模式
- 在宽工作范围内实现高效率
- 逐周期电流限制
- LED短路保护
- LED开路保护
- 过温保护
- 紧凑型SOT23-6封装

Description
Non-Isolated Buck LED Controller with PFC and No Auxiliary Winding

DW8532 is a constant current LED controller with high current accuracy which applies to single
stage step-down power factor corrected LED drivers. High accuracy of output current is achieved by sampling the output current directly. Critical conduction mode operation reduces the switching losses and largely increases the efficiency. DW8532 is supplied from the output directly and the auxiliary winding is not needed. DW8532 has multi-protection functions which largely enhances the safety and the reliability of system including: VCC over-voltage protection, VCC UVLO, shortcircuit protection, LED open protection, cycle-by-cycle current limit and overtemperature protection.
Applications
- DC/DC or AC/DC LED driver applications
- Signage and decorative LED lighting
- General lighting of flat panel displays
- RGB backlight
- General purpose constant current source
- Bulb light
Features
- No auxiliary winding
- High current accuracy of line and load
regulation
- High power factor with low output current-ripple
- Critical conduction mode
- High efficiency over wide operating range
- Cycle-by-cycle current limit
- LED short protection
- LED open protection
- Over-temperature protection
- Compact SOT23-6 package