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HM7166 Datasheet(PDF) 4 Page - Shenzhen Huazhimei Semiconductor Co., Ltd

Part # HM7166
Description  Dual-channel progressive LED constant current driver chip
PDF  6 Pages
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Manufacturer  HMSEMI [Shenzhen Huazhimei Semiconductor Co., Ltd]
Direct Link  http://www.hmsemi.com/
Logo HMSEMI - Shenzhen Huazhimei Semiconductor Co., Ltd

HM7166 Datasheet(HTML) 4 Page - Shenzhen Huazhimei Semiconductor Co., Ltd

  HM7166 Datasheet HTML 1Page - Shenzhen Huazhimei Semiconductor Co., Ltd HM7166 Datasheet HTML 2Page - Shenzhen Huazhimei Semiconductor Co., Ltd HM7166 Datasheet HTML 3Page - Shenzhen Huazhimei Semiconductor Co., Ltd HM7166 Datasheet HTML 4Page - Shenzhen Huazhimei Semiconductor Co., Ltd HM7166 Datasheet HTML 5Page - Shenzhen Huazhimei Semiconductor Co., Ltd HM7166 Datasheet HTML 6Page - Shenzhen Huazhimei Semiconductor Co., Ltd  
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输入电解电容设计
输入电解电容 C1 值越大，电压 Vin 纹波越小，
OUT 端口电压纹波越小。C1 值根据 LED 灯管总工作
电流而定：电流越大，C1 容值越大，一般取值 4.7uF/400V~22uF/400V。具体计算方法如下：
滤波电容 C1 容值：
V
t
I
C
LED
*
1
公式中，ILED 为整个方案中的恒流电流，时间 t ：在 50Hz 时约为（1/4）*（1/fAC） = 5ms，ΔV 是 OUT 端
口电压纹波。
HM7166 双通道递进式 LED 恒流驱动芯片



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