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AL9902 Datasheet(PDF) 2 Page - Diodes Incorporated |
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AL9902 Datasheet(HTML) 2 Page - Diodes Incorporated |
2 / 18 page AL9902 Document number: DS37878 Rev. 1 - 2 2 of 18 www.diodes.com July 2015 © Diodes Incorporated AL9902 Pin Descriptions Pin Name U-DFN5040-10 SO-16 Functions NC 1 14 No connection NC 2 1, 2, 4, 10,16 No connection PWM 3 5 Low Frequency PWM Dimming pin, also Enable input. Internal 200kΩ pull-down to GND VDD 4 6 Internally regulated supply voltage. 7.5V nominal. Can supply up to 1 mA for external circuitry. A sufficient storage capacitor is used to provide storage when the rectified AC input is near the zero crossing. LD 5 7 Linear Dimming input. Changes the current limit threshold at current sense comparator and changes the average LED current. ROSC 6 8 Oscillator control. A resistor connected between this pin and ground puts the AL9902 into fixed frequency mode and sets the switching frequency. VIN 7 9 Input voltage CS 8 11 Senses LED string and internal MOSFET switch current GND 9 12 Device ground NC 11 13 No connection SO 10 15 Source of the internal MOSFET Switch SW 12 3 Drain of the internal MOSFET switch. EP1 EP1 NA Exposed Pad 1(bottom). Drain connection of internal power MOSFET. EP2 EP2 NA Exposed Pad 2 (bottom). Substrate connection of control IC. Connect to GND directly underneath the package and large PCB area to minimize junction to ambient thermal impedance. Functional Block Diagram & Typical Application VDD LDO OSC OTP S R 250mV 200K Rsense 7.5V GND VDD LD PWM CS SO AL9902 Rosc SW Rosc VIN D1 VIN |
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