摘要：  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。

关键字：  反激变换器控制器，功率因数校正

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