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SC6803 Datasheet(PDF) 7 Page - SHENZHEN FUMAN ELECTRONICS CO., LTD.

Part # SC6803
Description  LED driver IC
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Manufacturer  FUMAN [SHENZHEN FUMAN ELECTRONICS CO., LTD.]
Direct Link  http://www.superchip.cn
Logo FUMAN - SHENZHEN FUMAN ELECTRONICS CO., LTD.

SC6803 Datasheet(HTML) 7 Page - SHENZHEN FUMAN ELECTRONICS CO., LTD.

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深圳市富满电子有限公司
SHENZHEN FUMAN ELECTRONICS CO., LTD.
SC6803(文件编号:S&CIC0807)
LED 驱动 IC
第 7 页 共 14 页
这里:ILED1 / ILED2 / ILED3 分别是流过各路 LED 灯的电流值,VOUT1/ VOUT2/ VOUT3 分别是各输出口对地的电
压。
RL 一般取值几十欧母,对 ILED 的大小没有影响,也可以不用,但加上适当大小的 RL 有助于分担芯片耗散
功率 PD,提高工作稳定性。
外挂恒压驱动模式
该模式(OMODE =接地)适用于多 LED 或灯电压较高的情况,实际上是能过 OUTX 输出电平控制外拉的
NPN 三极管驱动多个 LED。
限流电阻计算:RL = (VDD – VLED – VCE) / 20mA
这里:三极管工作在开关区,VCE 是三极管的饱和压降,一般 0.5-0.8V,基极电阻 RB 可取 2K-5K,其他信
号连接方式与前面模式相同。
该模式常用于多路
―先串再并‖接法,鉴于串联支路里任意一个 LED 断路时,会导致该支路全部 LED 都不
亮,所以使用该接法就遵循如下的原则:支路串联 LED 数不宜多(一般取 3-6 只),支路并联数不宜少。这样
不仅缩小了烧断一只 LED 的故障影响面,而且将限流电阻化整为零,将大功率电阻变成多只小功率电阻,由集
中安装变成分散安装,既利于电阻散热,又便于将灯具设计得更紧凑。
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B
C
D
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5
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D
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Title
Num ber
Revision
Size
B
Date:
26-Aug-2010
Sheet
of
File:
E:\规格书\规格图\规格图-0\ZBO\SC6803.ddb
Drawn By :
FB 1
FB 2
FB 3 G ND
V O U T
V O U X
D IN
D C L K
VCC
O M O D E = 'L'
V DD
1 2- 2 4V
RB
RL


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