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AATIAN60 Datasheet(PDF) 1 Page - SiGe Semiconductor, Inc. |
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AATIAN60 Datasheet(HTML) 1 Page - SiGe Semiconductor, Inc. |
1 / 4 page EV-118 AAT3152 EVAL: High Efficiency 1X/1.5X/2X Charge Pump For White LED Applications Introduction The AAT3152 EVAL board demonstrates the functionality of the AAT3152 and its application as a white LED backlight driver. The AAT3152 is a low-noise, constant frequency charge pump DC/DC converter with tri-mode load switch (1X), fractional (1.5X), and doubling (2X) conversion to maximize efficiency and operate over a wide input voltage range. The AAT3152 is programmable with the S 2Cwire™ (Simple Serial Control™) serial interface and is capable of driving up to four independent LED channels. Main/sub control is available with eight constant current level settings from 20mA down to 50µA. This document describes the evaluation board and its accompanying user interface. In addition, a brief Getting Started section is included to help the user begin operating the evaluation board. A schematic of the complete circuit is shown in Figure 1, and the actual board layout is given in Figures 2 and 3. For additional informa- tion, please consult the AAT3152 product datasheet. Schematic Figure 1: Evaluation Board Schematic. VDD 1 GP5 2 GP4 3 GP3 4 GP2 5 GP1 6 GP0 7 VSS 8 PIC12F675 U2 C3 1 µF C1 1 µF C2 1 µF C4 1 µF R6 100k Ω R1 1k Ω R4 330 Ω R5 330 Ω C5 10 µF R2 1k Ω R3 1k Ω R7 220 Ω J1 1 2 3 4 5 0 DOWN SW1 1 2 3 4 5 0 UP SW2 RED LED7 1 2 3 4 5 0 CYCLE SW3 DC+ DC- D2 D1 D4 D3 GND DC+ GND GND POT 10K VR4 GRN LED0 GND D4 1 EN/SET 2 C1+ 3 C1- 4 VOUT 5 C2+ 6 C2- 7 VIN 8 GND 9 D1 10 D2 11 D3 12 AAT3152 U1 GND GND J2 GND JP6 DC+ JP5 JPx EV-118.2005.06.1.0 1 |
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