参数资料
型号: AS1390A-ZQFT
厂商: ams
文件页数: 11/21页
文件大小: 0K
描述: IC BOOST CTLR/BUCK CONV 20-QFN
标准包装: 6,000
拓扑: 降压(降压),升压(升压)
输出数: 1
内部驱动器:
类型 - 主要: 背光
电源电压: 10 V ~ 30 V
安装类型: 表面贴装
封装/外壳: 20-VFQFN 裸露焊盘
供应商设备封装: 20-QFN(4x4)
包装: 带卷 (TR)
工作温度: -40°C ~ 85°C
AS1390A, AS1390B
Datasheet - D e t a i l e d D e s c r i p t i o n
8 Detailed Description
The AS1390 is a high efficiency, high voltage and high current DC-DC Step-up controller combined with an Step-down converter. The device is
designed for LED backlight in LCD TV-sets. The special feature is the optimized operation point for the 2D and 3D mode. Hence the output
voltage of the Step-up Converter can easily be switched via the MODE_3D pin from one voltage to the other.
Figure 18. Detailed Block Diagram Boost Converter
8.1 Boost Controller
8.1.1
Setting output voltages
The Output voltages of the AS1390 are defined by a voltage divider between the FB pin and Vout. Due to the capability of the AS1390 to switch
between two output voltages, two dividers are necessary to adjust both output voltages.
Output voltage for 2D-Mode:
V OUT – 2 D = V FB × ? ? ? ?
R FB 1
V OUT – 3 D = V FB × ? ? ? ?
R FB 1 + R FB 2
1 + -------------------------------
R FB 2 + R FB 3
Output voltage for 3D-Mode:
1 + -------------------------------
R FB 3
Where: V FB = 1.25V
Note: The overall resistance should be in the range of 100k to 200k ? to avoid any noise issues.
(EQ 1)
(EQ 2)
www.austriamicrosystems.com/Power-Management/AS1390
Revision 1.04
10 - 20
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