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CS6552 Huajing Microelectronics Precision primary side feedback LED constant current drive circuit Datasheet


Huajing Microelectronics
CS6552
Part Number CS6552
Manufacturer Huajing Microelectronics
Description CS6552/CS6552F R ○ 高精度原边反馈 LED 恒流驱动电路 本资料适用范围:CS6552EP、CS6552FEP 1 概述 CS6552/CS6552F 是一款离线式小功率 AC/DC 开关电源的高精度原边反馈 LED 恒流 驱动电路,内部集成 600V 高压功率管,适应于 85Vac~265Vac 全范围输入、反激式隔离 LED 恒流驱动。通过原边控制,无需光耦等次级反馈环路,即可实现高精度的 LED 恒 流输出,降低成本。 CS6552/CS6552F 内部集成了多重保护功能来加强系统的稳定性和可靠性,包括 V CC 欠压保护,LED 开路 / 短路保护,逐周期限流以...
Features 2.2.3 系统频率 CS6552/CS6552F 工作于断续模式,推荐的系统工作频率为 40kHz~48kHz ,系统工作 频率计算公式为: 2 VLED NP f = * 2 8 * I LED * LP N S 2.2.4 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。 CS6552/CS6552F 内部集成有前沿消隐功能,当 MOSFET 导通的瞬间,设计有 500ns 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。 VCS TLEB t 2.2.5 LED 开路保护 当 LED 发生开路, V CC 电压大于 14.5V ,内部逻辑将对 V CC 电容进行放电, V CC 电压会 在 14.5V 左右波动,输出电压会跟随 V CC 电压变化,实现 LED 开路保护功能。此时输出电压 由以下公式得到: Vout = (Vcc + VDa ) * N - VDo 无锡华润华晶微电子有限公司 第2页 共6页 CS6552/CS6552F R ○ 其中: N 为变压器辅助绕组和次级绕组匝数比 V Da 为辅助绕组整流二极管的正向导通电压 V Do 为次级续流二极管的正向导通电压 在异常情况下,V CC 大于 V CC 过压保护阈值时,芯片关断外部功率管,并且自动重启直 到异常情况解除。 2...

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Part Number Description
CS6552
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Huajing Microelectronics
Precision primary side feedback LED constant current drive circuit
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The CS6552 is a high precision primary-side-feedback LED lighting controller which integrates a 600V high voltage power MOSFET, it achieves 85Vac-265Vac input voltage and accurate LED current for single-power stage, isolated lighting applications. The constant current control method accurately controls the LED current from the primary side, and therefore significantly simplifies the LED lighting system design by eliminating the secondary side feedback components and opto-coupler. It also eliminates the need of loop compensation circuit while maintaining stability,and increase the reliability. The CS6552 works in discontinuous conduction mode to reduce the MOSFET switching losses. The extrem...
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