AL9910AS-13 Diodes Incorporated

AL9910/ AL9910A/ AL9910-5/ AL9910A-5 UNIVERSAL HIGH VOLTAGE HIGH BRIGHTNESS LED DRIVER Description Pin Assignments (Top View) The AL9910/A high voltage PWM LED driver-controller provides an efficient solution for offline high brightness LED lamps from rectified 1 8 R V line voltages ranging from 85V up to 277V . The AL9910 drives OSC AC AC IN external MOSFETs at switching frequencies up to 300kHz, with the CS 2 7 LD AL9910 switching frequency determined by a single resistor. The AL9910 GND 3 6 V DD topology creates a constant current through the LEDs providing 4 5 GATE PWM D constant light output. The output current is programmed by one external resistor and is ultimately determined by the external SO-8 MOSFET chosen and therefore allows many low current LEDs to be driven as well as a few high current LEDs. (Top View) The LED brightness can be varied by both Linear and PWM dimming R V 1 8 OSC using the AL9910s LD and PWM D pins respectively. The PWM D IN input operates with duty ratio of 0-100% and frequency of up to 2 7 CS LD AL9910 several kHz. GND 3 6 V DD The AL9910 can withstand input voltages up to 500V which makes it GATE 4 5 PWM D very resilient to transients at standard mains voltages. As well as SO-8EP standard SO-8 package the AL9910 is available in the thermally enhanced SO-8EP package. Applications Features LED Offline Lamps >90% Efficiency High Voltage DC-DC LED Driver Universal Rectified 85 to 277V Input Range AC Signage and Decorative LED Lighting Input Voltage Up to 500V Back Lighting of Flat Panel Displays Internal Voltage Regulator Removes Start-Up Resistor General Purpose Constant Current Source 7.5V MOSFET Drive AL9910 10V MOSFET Drive AL9910A Tighter Current Sense Tolerance: 5% AL9910-5, AL9910A-5 Drives LED Lamps with Both High and Low Current LEDs LED Brightness Control with Linear and PWM Dimming Internal Thermal Protection (OTP) Available in SO-8 and SO-8EP Packages Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) Halogen and Antimony Free. Green Device (Note 3) Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. 2. See AL9910/ AL9910A/ AL9910-5/ AL9910A-5 Typical Applications Circuit C3C3 D1D1 VV L1L1 ININ VV ININ VV C1C1 ACAC DDDD Q1Q1 AAL99L991010//AA BR1BR1 LDLD GAGATTEE C2C2 CSCS PWPWMM DD RR GNGNDD RR OSOSCC SENSENSSEE RR OSOSCC Pin Descriptions Pin Number Pin Function Name SO-8 SO-8EP 1 1 Input Voltage V IN CS 2 2 Senses LED string and external MOSFET switch current GND 3 3 Device Ground Gate 4 4 Drives the gate of the external MOSFET switch. PWM D 5 5 Low Frequency PWM Dimming pin, also Enable input. Internal 200k pull-down to GND. Internally regulated supply voltage. 7.5V nominal for AL9910 and AL9910-5 V 6 6 DD 10V nominal for AL9910A. 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. Linear Dimming Input. Changes the current limit threshold at current sense comparator and changes the LD 7 7 average LED current. Oscillator Control. A resistor connected between this pin and ground sets the PWM frequency. The devices 8 8 can be switched into constant off time (PFM) mode by connecting the external oscillator resistor between R OSC R pin and the gate of the external MOSFET. OSC EP PAD N/A EP Exposed Pad (bottom). Connect to GND directly underneath the package. Functional Block Diagram 2 of 15 May 2014 AL9910/ AL9910A/ AL9910-5/ AL9910-5A Diodes Incorporated www.diodes.com Document number: DS35103 Rev. 9 - 2