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CAT4134HV2 参数 Datasheet PDF下载

CAT4134HV2图片预览
型号: CAT4134HV2
PDF下载: 下载PDF文件 查看货源
内容描述: 500毫安双通道电影/闪光灯LED驱动器 [500mA Dual Channel Movie/Flash LED Driver]
分类和应用: 显示驱动器驱动程序和接口接口集成电路闪光灯
文件页数/大小: 13 页 / 321 K
品牌: CATALYST [ CATALYST SEMICONDUCTOR ]
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CAT4134  
DEVICE OPERATION  
The device is powered from the input pin VIN. A  
switching frequency of 1.2MHz is used in Movie mode,  
when the FLASH input is low. Continuous LED current  
up to 50mA is controlled by the RSET resistor. For  
higher load current, the Flash mode is selected by  
setting the FLASH input pin high. RFLASH now  
controls the LED current. In flash mode, the driver  
efficiency is kept high even under high load current by  
using a lower switching frequency of 900kHz. In movie  
mode, the higher frequency of 1.2MHz provides a lower  
noise operation.  
resistor ratio sets the maximum output voltage as  
shown in the equation below:  
R1/R2 = (VOUTMAX /1.2) - 1.2  
VOUTMAX should always be higher than the total LED  
forward voltage (ΣVf) plus 1.2V. Also VOUT must be  
less than ΣVf + 8V.  
Vf + 1.2V < VOUT  
< Vf + 8V < 16V  
Σ
Σ
MAX  
If the overvoltage protection is not needed, then the  
OVP pin should be connected to Ground. In that case,  
the maximum voltage on the SW pin is set to 17V.  
Overvoltage Protection (OVP)  
To prevent the SW pin voltage from exceeding the  
internal switch maximum voltage rating, an overvoltage  
protection (OVP) function is supported. The OVP pin  
allows to set the maximum operating voltage on the  
output VOUT using external resistors R1 and R2. The  
BLOCK DIAGRAM  
VIN  
VOUT  
C
IN  
C
OUT  
SW  
VIN  
EN  
Dual  
Frecuency  
PWM  
PGND  
Controller  
LED1  
LED2  
R1  
R2  
FLASH  
OVP  
RFLASH  
Current  
Setting  
2 Current Sink  
Regulators  
mux  
RSET  
RFLASH  
RSET  
AGND  
Doc. No. 5021 Rev. A  
8
© 2006 Catalyst Semiconductor, Inc.  
Characteristics subject to change without notice.