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FM8301C Datasheet(PDF) 6 Page - SHENZHEN FUMAN ELECTRONICS CO., LTD.

Part # FM8301C
Description  Non-isolated step-down LED driver IC
Download  9 Pages
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Manufacturer  FUMAN [SHENZHEN FUMAN ELECTRONICS CO., LTD.]
Direct Link  http://www.superchip.cn
Logo FUMAN - SHENZHEN FUMAN ELECTRONICS CO., LTD.

FM8301C Datasheet(HTML) 6 Page - SHENZHEN FUMAN ELECTRONICS CO., LTD.

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深圳市富满电子集团股份有限公司
SHEN ZHEN FINE MAD ELECTRONICS GROUP CO., LTD.
FM8301(文件编号:S&CIC1605)
非隔离降压型 LED 驱动 IC
www.superchip.cn
6 页 共 9 页
Version 1.1
应用信息
FM8301 是一款专用于 LED 照明的恒流驱动芯片,应用于非隔离降压型 LED 驱动电源。采用专利的退磁检测技
术和高压
JFET 供电技术,无需 VCC 电容和启动电阻,使其外围器件更简单,节约了外围的成本和体积。
启动
系统上电后,母线电压通过 HV 脚对芯片内部供电, 当内部供电电压达到芯片开启阈值时,芯片内部控制电路
开始工作。芯片正常工作时,所需的工作电流仍然通过内部的 JFET 对其提供。
恒流控制,输出电流设置
芯片逐周期检测电感的峰值电流,CS 端连接到内部的峰值电流比较器的输入端,与内部 500mV 阈值电压进行比
较,当 CS 电压达到内部检测阈值时,功率管关断。
电感峰值电流的计算公式为:
其中,RCS 为电流采样电阻阻值。CS 比较器的输出还包括一个 500ns 前沿消隐时间。
LED 输出电流计算公式为:
其中, IPK 是电感的峰值电流。
储能电感
FM8301 工作在电感电流临界模式,当功率管导通时,流过储能电感的电流从零开始上升,导通时间为
其中,L 是电感量;IPK 是电感电流的峰值;VIN 是经整流后的母线电压;VLED 是输出 LED 上的电压。
当功率管关断时,流过储能电感的电流从峰值开始往下降,当电感电流下降到零时,芯片内部逻辑再次将功率管开通。
功率管的关断时间为:


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