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AS1390B Datasheet(PDF) 11 Page - ams AG |
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AS1390B Datasheet(HTML) 11 Page - ams AG |
11 / 21 page www.austriamicrosystems.com/Power-Management/AS1390 Revision 1.04 10 - 20 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: Output voltage for 3D-Mode: Where: VFB = 1.25V Note: The overall resistance should be in the range of 100k to 200k Ω to avoid any noise issues. (EQ 1) V OUT 2D – V FB 1 R FB1 R F B2 R FB3 + ------------------------------- + × = (EQ 2) V OUT 3D – V FB 1 R FB 1 R FB2 + R FB3 ------------------------------- + × = |
Similar Part No. - AS1390B |
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Similar Description - AS1390B |
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