参数资料
型号: AS1104
厂商: ams
文件页数: 10/14页
文件大小: 0K
描述: IC LED QUAD DRIVER 40MA 8-MSOP
标准包装: 50
拓扑: 线性(LDO),PWM
输出数: 4
内部驱动器:
类型 - 主要: 背光,照明管理装置(LMU)
类型 - 次要: 颜色,白色 LED
电源电压: 2.2 V ~ 3.6 V
输出电压: 0.15 V ~ 3.6 V
安装类型: 表面贴装
封装/外壳: 8-TSSOP,8-MSOP(0.118",3.00mm 宽)
供应商设备封装: 8-MSOP
包装: 管件
工作温度: -40°C ~ 85°C
产品目录页面: 804 (CN2011-ZH PDF)
AS1101/AS1102/AS1103/AS1104
Data Sheet - A p p l i c a t i o n I n f o r m a t i o n
8 Application Information
Figure 19. Typical Application Diagrams
V IN
2 Diode Control with Enable
V IN
3 Diode Control with Enable
I1/I2 V SAT
I3/I4
I1 V SAT
I2
I3
V SET
I SET
V SET
I SET
(3V)
R SET CTRL
AS1101
(3V)
R SET CTRL
AS1102
ENABLE
ON
V IN
GND
4 Diode Control
ENABLE
ON
V IN
GND
4 Diode Control with Enable
I1 V SAT I2
I3
I4
I1 V SAT I2
I3
I4
I SET
V SET
(3V)
I SET
R SET CTRL
AS1103
V SET
(3V)
R SET CTRL
AS1104
ENABLE
ON
GND
GND
Setting the LED Current
The current going into the LEDs is approximately OCMR times greater then the current I SET . LED current is controlled
by V SET and R SET (see Figure 19 ) according to the formula:
I LED = OCMR x (V SET - V CTRL )/R SET
(EQ 1)
For V SET = 3V and a specific LED current, the value of R SET can be determined using the graphs shown in Figure 9 ,
Figure 10 , and Figure 11 on page 7. For any other option, the value of I SET can be determined using the graph in
Figure 3 on page 6 .
Note: LED brightness can also be adjusted by driving pin ENABLE or pin CTRL with a PWM signal.
www.austriamicrosystems.com
Revision 1.5
9 - 13
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