ISL1904是一种高性能的ISL1904,临界导电模式(CrCM)，$反激变换器控制器用于单级转换的交流电源,恒流源的功率因数校正(PFC)。控制器调节输出电流,通过监测一次侧开关电流所以反馈信号不穿过隔离屏障。
The ISL1904 is a high-performance, critical conduction mode (CrCM), flyback controller used for single-stage conversion of the AC mains to a constant current source with power factor correction (PFC). The controller regulates the output current by monitoring the primary side switching current so the feedback signal does not cross the isolation barrier. Operation in CrCM allows near zero-voltage quasi-resonant switching (ZVS) for improved efficiency while maximizing magnetic core utilization. The ISL1904 LED driver provides all of the features required for high-performance dimmable LED ballast designs and supports AC or DC input, isolated or non-isolated flyback and boost topologies. This advanced BiCMOS controller features all of the functions required to design low cost low parts count LED driver.
KEY FEATURES
Excellent LED current regulation over line, load, and temperature
0 – 100% dimming with leading-edge (triac) and trailing-edge dimmers
Power factor correction for up to 0.995 power factor and less than 20% harmonic content
Critical conduction mode (CrCM) operation for quasi-resonant high efficiency performance
Supports universal AC mains input
Configurable for PWM or DC current dimming control of LEDs
Monitors FET switching current for load regulation
Supports isolated and non-isolated boost and flyback topologies
Closed loop soft-start for no overshoot
OFFREF feature to set dimming off-point to improve fixture performance matching
-40°C to +125°C operation
Pb-free (RoHS compliant)
APPLICATIONS
Industrial and commercial LED lighting
Retrofit LED lamps with triac dimming
Universal AC mains input LED retrofit lamps
AC or DC Input LED ballasts
