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CS6583 Semico Non-isolated step-down constant current LED driver circuit Datasheet


Semico
CS6583
Part Number CS6583
Manufacturer Semico
Description MOS 电路 CS6583 非隔离降压型 LED 恒流驱动电路 1、概述 本资料适用范围:CS6583BBO/CS6583BO/CS6583CBO/CS6583DBO/CS65L83BP CS6583 是一款单电感非隔离降压型 LED 恒流驱动电路,工作在电感电流临界连续 模式下。适用于 85Vac~265Vac 全电压输入范围。电路的工作电流极低,只需要很少的 外围元件。在较大的范围内,系统的输出电流与电感量无关。电路具有优异的线性调整 率和负载调整率,降低系统成本。 CS6583 的主要应用于 LED 蜡烛灯、LED 球泡灯及其它 LED 照明领域。 其特点如下: ● ...
Features EF 2  RCS 其中,VREF 为 CS 采样阈值电压(典型值为 400mV) RCS 为电感电流采样电阻 2.2.3、前沿消隐 由于存在寄生电容,MOSFET 在导通瞬间,会产生一个脉冲电流。CS6583 内部集 成有前沿消隐功能,在 MOSFET 导通的瞬间,设计有 350ns 的前沿消隐时间,在这段时 间内,电流比较器停止工作,避免脉冲电流让电流比较器发生误翻转,如下图所示: VCS TLEB=350ns 图 2 前沿消隐 t 版本:S-2014-07-F 无锡华润矽科微电子有限公司 第2页 共9页 MOS 电 路 CS6583 2.2.4、可调阈值 LED 过压保护 CS6583 集成有 LED 过压保护功能,可以通过设置 VOL 引脚电阻 RVOL 来设置 LED 开路保护电压。RVOL 和输出空载电压 VOL 之间的关系如下: RVOL  32  L  IO VOL 106 (K) TOFF _ MIN  0.066  RVOL (us) 其中,L 为电感感值,IO 为输出电流大小,TOFF_MIN 为最小关断时间。 2.2.5、过温保护 为了避免温度过高而损坏器件,CS6583 内置过温调节功能。当温度过高时,逐渐减 小输出电流,从而控制输出功率和温升,当温度高于 150℃时,将关断芯片并锁定,直 到 VDD 降到欠压保...

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