onsemi FL7733A 初级端调节 LED 驱动器

仙童FL7733A 初级端调节 LED 驱动器是高度集成的 PWM 控制器，采用了先进的初级端调节（PSR）技术，可减少中低功率 LED 照明转换器元器件数量。使用创新的 TRUECURRENT® 技术可输出严密的容差恒定电流，在通用线路电压范围内，其 LED 驱动器的设计恒流容差小于 ±1% ，可以满足严苛的 LED 亮度要求。FL7733A 可在通用线路电压范围内实现最小的导通时间波动、高功率因数和较低的 THD。采用一个集成式高电压启动电路，实现了快速启动和高系统效率。在启动期间，通过自适应反馈回路控制，预测稳态状况并设置接近于稳态的初始反馈状况，从而避免出现 LED 电流过高或过低。FL7733A 提供多种强大的保护功能，如 LED 短路/开路、输出二极管短路、检测电阻短路/开路以及过温保护，从而实现较高的系统可靠性。

特性

±3% total constant current tolerance over all conditions
- ±1% over universal line voltage variation ±1% from 50% to 100% load voltage variation
- ±1% with ±20% magnetizing inductance variation
Primary-Side Regulation (PSR) control
80V_AC to 308V_AC application input voltage range
High PF of 0.9, and low THD of 10% over universal line input range
Fast 200ms start-up (at 85V_AC) using internal high-voltage start-up with V_DD regulation
Adaptive feedback loop control for startup without overshoot

Protection
- LED short / open protection
- Output diode short protection
- Sensing resistor short / open protection
- VDD Over-Voltage Protection (OVP)
- VDD Under-Voltage Lockout (UVLO)
- Over-Temperature Protection (OTP)
- All Protections are Auto Restart (AR)
- Cycle-by-cycle current limit