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AAT1231 Datasheet(PDF) 9 Page - Advanced Analogic Technologies |
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AAT1231 Datasheet(HTML) 9 Page - Advanced Analogic Technologies |
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9 / 27 page  AAT1231 Step-Up DC/DC Converters for White LED Backlight Applications SwitchRegTM PRODUCT DATASHEET 1231.2008.06.1.5 9 www .analogictech.com Functional Description The AAT1231 and the AAT1231-1 consist of a DC/DC boost controller, an integrated slew rate controlled input disconnect MOSFET switch, and a high voltage MOSFET power switch. A high voltage rectifier, power inductor, output capacitor, and sense resistors are required to implement a DC/DC constant current boost converter. The input disconnect switch is activated when a valid input voltage is present and the EN/SET pin is pulled high. The slew rate control on the P-channel MOSFET ensures minimal inrush current as the output voltage is charged to the input voltage, prior to the switching of the N-channel power MOSFET. Monotonic turn-on is guaranteed by the integrated soft-start circuitry. Soft- start eliminates output voltage overshoot across the full input voltage range and all loading conditions. The maximum current through the LED string is set by the ballast resistor and the feedback voltage of the IC. The output current may be programmed by adjusting the level of the feedback reference voltage which is pro- grammed through the S2Cwire interface. The SEL pin selects one of two feedback voltage ranges. For the AAT1231 and with a LOW logic level applied to the SEL pin, the FB pin voltage can be programmed from 0.1V to 0.4V. With a logic HIGH applied to the SEL pin, the FB pin voltage can be programmed from 0.3V to 0.6V. In the AAT1231-1, the SEL function is inverted in that the FB pin voltage can be programmed from 0.4V to 0.1V with a logic LOW applied to the SEL pin and 0.6V to 0.3V with a logic HIGH applied to the SEL pin. Regardless of which device is chosen, the feedback voltage can be set to any one of 16 current levels within each FB range, providing high-resolution control of the LED current, using the single-wire S2Cwire control. For torch and flash applications where a short duration, pulsed load is desired, applying a low-to-high transition on the AAT1231’s SEL pin produces a 1.5x to 3.0x LED current step. In the AAT1231-1 on the other hand, the LED current step for a low-to-high transition on the SEL Functional Block Diagram Control Reference Output Select FB SEL EN/SET PVIN LIN SW AGND PGND OVP VIN |
Similar Part No. - AAT1231_08 |
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Similar Description - AAT1231_08 |
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