AL6562S-13 Diodes Incorporated

AL6562 Transition Mode PFC LED Controller Description Features The AL6562 is a current mode Power Factor Correction Controller and Single Stage Fly-Back PFC Controller is designed for operating in Transition Mode. With a superior linear Transition Mode Operation performance multiplier, it ensures the device operates over a wide Low Start-Up, Operating and Quiescent Currents input voltage range with superior THD (Total Harmonics Distortion). Internal Start-Up Timer The output voltage is controlled by means of an error amplifier and a Enable/Disable Function on INV Input precise (1% T = +25C) internal voltage reference. J Totem Pole, Push-Pull Output Drive Adjustable Output Overvoltage Protection The AL6562 is designed to meet stringent energy-saving standards SO-8 : Available in Green Molding Compound (No Br, Sb) with low start-up current, and can operate with low current Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) consumption when entering stand-by mode. Halogen and Antimony Free. Green Device (Note 3) OVP circuitry increases system robustness, allowing the device to withstand transient caused at start-up and during load-disconnects. Pin Assignments Applications Electronic Single-Stage LED Driver PFC Pre-Regulators to meet IEC61000-3-2 (Top View) High-End AC-DC Adaptor / Charger 1 8 Vcc INV 2 7 GD COMP AL6562 MULT GND 3 6 CS 4 5 ZCD SO-8 (SO-8/ M Package) Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. 2. See AL6562 Pin Descriptions Pin Number Pin Name Brief Description Inverting Input Pin of the Internal Error Amplifier This pin is connected externally via a resistor divider from the regulated output voltage. It can provide 1 INV input to inverting input of internal error amplifier. This pin can also be used as ENABLE/DISABLE control input. Output from Error Amplifier A feedback compensation network consisting of resistor and capacitor connects between INV (Pin1) 2 COMP and this pin to reduce the bandwidth and achieve stability of the voltage control loop and ensure high power factor and low THD. Input to the Internal Multiplier 3 MULT This pin connects to the rectified mains voltage through external resistor divider to provide a sinusoidal voltage reference for the control current loop. Current Sense Connecting to External Resistor for Current Feedback The current flowing in the MOSFET is sensed through a resistor, the resulting voltage is applied to this 4 CS pin and compared with an internal sinusoidal-shaped reference generated by the multiplier to determine MOSFETs turn-off. This pin has an internal Leading-Edge-Blanking of about 200 nanoseconds to improve noise immunity. Zero Current Detection 5 ZCD This pin takes input from inductors demagnetization sensing to achieve zero current detection, required for Transition Mode (TM) operation. A negative-going edge triggers turn-on of MOSFET. System Ground 6 GND Ground for circuit. Current return for both the signal circuitry and the gate drive stage. Gate Driver Output This pin is able to drive external MOSFET. The totem-pole output stage is able to drive MOSFET with a 7 GD peak current of 600mA/800mA for source and sink capability respectively. The high level voltage of this pin is internally clamped at about 12V to avoid excessive gate voltage in case V pin is supplied by a CC higher voltage. System Power Input Pin This pin is for supply voltage of both the signal part and gate driver of the IC. Upper limit is extended to 8 V CC a maximum of 22V to provide more headroom for supply voltage changes. This pin has an internal 25V Zener to protect the IC itself from overvoltage transients. Functional Block Diagram COMP MULT CS 2 3 4 1 INV 40K Multiplier INV Disable Overvoltage 10 pF 1.7V Detection Voltage Regulation 0.47 V/0.3V VCC 8 VCC R Q Internal Supply R1 7.5 S V 24V UVLO 7 INV Disable Driver GD Vref R2 Zero Current Detector 2.1V Starter 1.6V Upper & Lower ZCD Disable Clamp 6 5 GND ZCD 2 of 16 AL6562 February 2015 Diodes Incorporated www.diodes.com Document Number: DS37542 Rev. 2 - 2 NEW PRODUCT