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SM8135A 参数 Datasheet PDF下载

SM8135A图片预览
型号: SM8135A
PDF下载: 下载PDF文件 查看货源
内容描述: 白光LED驱动IC [White LED Driver IC]
分类和应用: 驱动
文件页数/大小: 20 页 / 157 K
品牌: NPC [ NIPPON PRECISION CIRCUITS INC ]
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SM8135A  
(2) Setting LED current using PWM signal input on EN  
The EN input is used to enable/disable circuit operation, but it can also be switched at speed using a PWM sig-  
nal input to set the average LED drive current value. When using PWM signal input on EN only for dimming  
control, the average LED drive current is given by the multiplication of the maximum current value (I  
set by RSET and the PWM signal ON duty percentage.  
)
LED MAX  
I
= I  
× ON Duty [%]  
LED  
LED MAX  
The PWM signal ON duty is defined in the following figures (“PWM duty”). The PWM signal operating fre-  
quency range is 10kHz to 100kHz (10µs to 100µs per period), and the allowable duty range is 10 to 100%.  
However, LED drive current that can be set by PWM signal has lower limit (= 2mA). When setting current to  
2mA or less, even if the signal ON duty is within the allowable range, the current between pins varies widely.  
High  
EN  
Low  
DUTY100%  
DUTYꢁ0%  
DUTY10%  
DUTY2ꢁ%  
turn on  
(ILED MAX)  
ILED MAX  
ILED = ILED MAX ꢁ0%  
ILED  
ILED = ILED MAX 10%  
ILED = ILED MAX 2ꢁ%  
turn off  
(0)  
turn off  
(0)  
0
Dimming control with PWM signal  
1period  
10µsec 1period 100µsec  
ON  
OFF  
Duty [%] = ON interval/1period  
interval interval  
ON  
OFF  
ILED = ILED MAX Duty [%]  
PWM duty  
SEIKO NPC CORPORATION —6