AL1665 HIGH PERFORMANCE DIMMABLE LED CONTROLLER Description Pin Assignments The AL1665 is a high performance single stage flyback and buck- boost controller, targeting dimmable LED lighting application. It is a (Top View) Primary Side Regulation (PSR) controller which can provide accurate Constant Current (CC) regulation without opto-coupler and secondary control circuitry. It can be operated at BCM mode which results in low ADIM 1 8 FB EMI and high efficiency, and keeps high Power Factor (PF) and low VCC 2 7 NTC/PWM Total Harmonic Distortion (THD) under universal input voltage. OUT 3 6 COMP The AL1665 can support analog/PWM dimming modes. When a 50mV to 2.5V DC signal is applied on ADIM pin, the device will be 5 CS 4 GND operated in analog dimming mode. The analog dimming range is 5% to 100%. When a PWM signal is applied to NTC/PWM pin, the device will be operated at PWM dimming mode. The PWM dimming range is SO-8 (Standard) 0.5% to 100% (1k PWM dimming frequency). The AL1665 features low operation current. It integrates multiple Applications protections including over voltage, short circuit, over current and over General LED Lighting Driver with Dimming Function temperature. General Purpose Constant Current Source LED Backlighting Driver The AL1665 is available in SO-8 (Standard) package. Smart LED Lighting Features Primary Side Regulation without Opto-Coupler Valley Switching for Low Switching Loss Low Start-Up Current Support Analog and PWM Dimming Analog Dimming Range: 5% to 100% PWM Dimming Range: 0.5% to 100% (1k PWM Frequency) Internal Protections Under Voltage Lock Out (UVLO) Output Over Voltage Protection (OVP) Output Short Protection (OSP) Over Current Protection (OCP) CS Short Protection Winding Short Circuit Protection Secondary Diode Short Protection Shorted Current Sense Protection User Programmable NTC Based Thermal Foldback Internal Thermal Fold-Back Protection (TFP) Over Temperature Protection (OTP) Low System Cost High PF>0.9 and Low THD<20% High Efficiency Tight LED Current Variation Range LED Current Line Regulation: 2% LED Current Load Regulation: 2% Full Load to Half Load Tight Output Open Voltage Variation Range Package: SO-8 (Standard) 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) & 2015/863/EU (RoHS 3) compliant. 2. See AL1665 Typical Applications Circuit C7 R14 L1 T1 D3 + C5 OUT C6 R10 R11 C1 C2 R TH F1 D2 AC VR1 Input Aux R4 D1 DB1 C VCC R5 D4 VCC AD IM Q1 FB OUT AL1665 R9 COMP R6 GND NTC/PWM CS RCOMP U1 R C CS COMP Flyback Application Circuit L1 T1 R TH OUT C2 R11 C1 C6 F1 D3 AC VR1 Input Aux R4 D1 DB1 C VCC R5 D4 VCC ADIM Q1 FB OUT AL1665 R9 COMP R6 CS NTC/PWM GND R COMP R CS C COMP Buck-Boost Application Circuit Pin Descriptions Pin Number Pin Name Function 1 ADIM Analog Dimming Input Pin 2 NTC/PWM NTC Input Pin for Thermal Foldback/PWM Dimming Input Pin 3 COMP Loop Compensation Pin 4 CS Current Sense Pin, Connect This Pin to the Source of the Primary Switch 5 GND Ground 6 OUT Gate Driver Output 7 VCC Supply Voltage of Gate Driver and Control Circuits of the IC 8 FB The Feedback Voltage Sensing from the Auxiliary Winding 2 of 16 AL1665 March 2019 Diodes Incorporated www.diodes.com Document number: DS41772 Rev. 1 - 2 NEW PRODUCT +