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AL3159FSG-7 Datasheet(PDF) 6 Page - Diodes Incorporated |
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AL3159FSG-7 Datasheet(HTML) 6 Page - Diodes Incorporated |
6 / 10 page AL3159 HIGH EFFICIENCY 1x/2x CHARGE PUMP FOR WHITE LED APPLICATIONS AL3159 Document number: DS35048 Rev. 2 - 2 6 of 10 www.diodes.com January 2011 © Diodes Incorporated Functional Description The AL3159 is a dual-mode high efficiency charge pump (1x and 2x) device, driving nine LED channels with three simple logic control inputs, intended for white LED backlight applications. An internal comparator circuit compares the voltage at each constant current sink input against a reference voltage. To ensure maximum power efficiency, the most appropriate switching mode (1x and 2x) is automatically selected. The AL3159 requires only three external components: one 1 µF ceramic flying capacitor (C1) for the charge pump, one 2.2µF ceramic input capacitor (CIN), and one 2.2µF ceramic charge pump output capacitor (COUT). The each output channel of the AL3159 can drive nine individual LEDs with a maximum current of fixed manufacture setting (20mA or 30mA) per channel. These can be paralleled to give a total maximum output current of 270mA. Disabled Current Sinks Unused current channels must be disabled by connecting the sinks to VOUT with only a small sense current flowing through the disabled channel. Soft-Start Soft-start is incorporated to prevent excessive inrush current during power-up, mode switching, and transitioning out of stand-by mode. Short-Circuit Protection Short-circuit protection function is incorporated to prevent excessive load current when either flying cap terminals or output pin electrically tied to a very lower voltage or ground. Over-Voltage Protection Over-Voltage Protection function is incorporated to limit the output voltage under a safe value to avoid on-chip device breakdown. Under-Voltage Lockout Under-Voltage lockout feature disables the device when the input voltage drops below UVLO threshold. Thermal Auto Shutdown When the die temperature exceeds the thermal limit, the device will be disabled and enter stand-by mode. The operation resumes whenever the die cools off sufficiently. CTL<3:1> LED ON/OFF CONTROL 000 ALL OFF 001 LED1~LED2 ON 010 LED3~LED5 ON 011 LED6~LED9 ON 100 LED9 ON 101 LED6~LED8 ON 110 LED1~LED5 ON 111 ALL ON |
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