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 that can provide accurate constant current (CC) regulation without optocoupler 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 total harmonic distortion (THD) under universal input voltage. VCC 2 7 NTC/PWM The AL1665 can support analog/PWM dimming modes. When a OUT 3 6 COMP 50mV to 2.5V DC signal is applied on ADIM pin, the device is operated in analog dimming mode. The analog dimming range is 5% 5 GND CS 4 to 100%. When a PWM signal is applied to NTC/PWM pin, the device is operated at PWM dimming mode. The PWM dimming range is 0.5% to 100% (1k PWM dimming frequency). SO-8 (Standard) The AL1665 has full protection features. It integrates multiple protections including undervoltage lockout (UVLO), output overvoltage (OVP), output short circuit (OSP), overcurrent protection (OCP), winding short circuit, secondary diode short, internal thermal foldback (TFP), and overtemperature protection (OTP). The AL1665 is available in SO-8 (Standard) package. Features Applications Primary Side Regulation without Optocoupler General LED Lighting Driver with Dimming Function Valley Switching for Low Switching Loss General Purpose Constant Current Source Tight CS Reference Voltage 0.4V1.5% LED Backlighting Driver High PF>0.9 and Low THD<20% Smart LED Lighting Support Analog and PWM Dimming Analog Dimming Range: 5% to 100% PWM Dimming Range: 0.5% to 100% (1k PWM Frequency) Internal Protections Undervoltage Lockout (UVLO) Output Overvoltage Protection (OVP) Output Short Protection (OSP) Overcurrent Protection (OCP) Winding Short-Circuit Protection Secondary Diode Short Protection Shorted Current Sense Protection User Programmable NTC Based Thermal Foldback Internal Thermal Foldback Protection (TFP) Overtemperature Protection (OTP) 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) For automotive applications requiring specific change control (i.e. parts qualified to AEC-Q100/101/200, PPAP capable, and manufactured in IATF 16949 certified facilities), please contact us or your local Diodes representative. AL1665 Typical Applications Circuit C7 R14 T1 L1 D3 + C5 OUT R10 R11 RTH C6 C1 C2 F1 D2 AC VR1 Input Aux R4 D1 DB1 Cvcc D4 R5 VCC ADIM Q1 OUT FB AL1665 R9 COMP R6 CS NTC/PWM GND Rcomp U1 R NTC CS Ccomp Flyback Application Circuit L1 T1 R TH OUT C2 R11 C1 C6 F1 D3 AC VR1 Input Aux R4 D1 DB1 Cvcc D4 R5 VCC ADIM Q1 FB OUT AL1665 R9 COMP R6 CS NTC/PWM GND Rcomp RCS NTC Ccomp 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 17 AL1665 March 2020 Diodes Incorporated www.diodes.com Document number: DS41772 Rev. 3 - 2 +