AC-DC LED Drivers | FL7921R

集成式临界模式 PFC 和准谐振电流模式 PWM 照明控制器

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高度集成的 FL7921R 将功率因数控制器 (PFC) 和准谐振 PWM 控制器相结合。这种集成提供了成本高效的设计，可减少外部组件数量。对于 PFC，FL7921R 使用控制导通时间技术提供调节的直流输出电压，执行自然的功率因数校正。创新的 THD 优化器降低了零交叉期间的输入电流失真，改善了 THD 性能。无论 PWM 级负载条件如何，PFC 功能总是处于打开状态，以确保在轻负载条件下实现高 PF。对于 PWM，FL7921R 提供了若干提高电源系统性能的功能：谷检测、绿色模式运行、高/低线路过功率补偿。保护功能包括带自动恢复的辅助侧开环和过电流保护、外部锁存触发、通过 RT 引脚和外部 NTC 电阻可调的超温保护、内部超温关断、VDD 引脚 OVP、用于输出 OVP 的 DET 引脚过电压，以及用于交流输入电压 UVP 的欠电压/过电压保护。除 PWM 电流感应引脚开路保护之外，所有保护均为自动恢复模式。

  • 集成式PFC和反激式控制器
  • 临界模式PFC控制器
  • PFC级的零电流检测
  • PWM级的准谐振运行
  • QR PWM 级的内部最小值为 tOFF 8 µs
  • PWM 的 9.5 ms 内部软启动
  • 掉电保护
  • 高/低线路过功率补偿
  • 自动恢复过流保护
  • 自动恢复开环保护
  • 自动恢复过温保护
  • 通过 RT 引脚和外部 NTC 电阻实现的可调节过温保护
  • 自动恢复 VDD 引脚和输出电压 OVP

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FL7921RMX

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Pb

A

H

P

SOIC-16

751BG

3

260

REEL

2500

Y

PFC and PWM(QR Flyback) Combo

50

500

19 VGATE

80/40 ns - Rise/Fall time

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$0.6332

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Die Related Summary Data

Device: FL7921RMX

Equivalent to wafer fab process: CN

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等效器件小时

平均故障间隔时间/平均无故障时间（按小时计算）

FITS

CN

6

425600109

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Note: The temperature and confidence level may be adjusted to your requirements.

Disclaimer: A reliability FIT rate calculated using this tool shall not be used for any functional safety purpose. In case a raw FIT rate needs to be estimated for a component which is targeted to be used in a safety critical application (i.e. compliant to ISO 26262 standard) it should be calculated according to generic safety standards (IEC62380, IEC61709, SN29500, FIDES, etc.)

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