AAT2845 Four-Channel Backlight Driver with Dual LDOs
The AAT2845 is a monolithically integrated dual N-channel high-voltage cascode-clamp lateral TrenchDMOS array. The dual-channel AAT2845 monolithically integrates both current-sink (CS) and high-voltage cascode-clamp (CC) power MOSFETs required for reliably driving a large series string of LEDs as used in a variety of lighting and display backlight applications. The AAT2845’s low-voltage current-sink (CS) device, required for closed-loop current control in large panel LED driver applications, is constructed using Skyworks' robust lateral TrenchDMOS process featuring superior hot carrier performance needed for reliable constantcurrent operation. It has a low on resistance, typically 1.5Ω, facilitating constant current operation over a wide dynamic range. The low-voltage current-sink Lateral TrenchDMOS process features a low threshold voltage (VGS(ON)) and can be driven directly from a 5V supply. The high-voltage cascode-clamp TrenchDMOS device has a drain-to-source voltage rating of 150V. With a 12V gate drive, it exhibits a typical on-resistance of 5Ω. In high-voltage LED backlighting applications for TVs and large-screen LCD panels, the AAT2845 TrenchDMOS array allows control of two series strings of LEDs with up to 40 LEDs per string. Each series connected TrenchDMOS pair comprises a current sink device with its gate actively driven by a backlight driver IC (such as the AAT2430A-1 or the AAT2405). To facilitate direct temperature measurement of the AAT2845 in a system, a series connected string of P-N junction diodes is included with both anode and cathode connections available separate from the supply.
技术特性
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应用领域 APPLICATION
订购信息 Ordering Information
AAT2845 典型应用
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| 应用技术支持与电子电路设计开发资源下载 | 版本信息 | 大小 |
| AAT2845 数据资料DataSheet下载:pdf | Rev.V2 | 2 页 |
