AL1666 HIGH PERFORMANCE DIMMABLE LED CONTROLLER Description Pin Assignments The AL1666 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 is operating at BCM mode which results in good EMI and efficiency, and keeps high PF and low THD under ADIM 1 8 FB universal input voltage. PWMD 2 VCC 7 The AL1666 can support analog/PWM dimming modes. When a 0 to 2.4V DC signal is applied on ADIM pin, the device will operate in OUT 3 6 COMP analog dimming mode when a digital signal is applied on PWMD pin and the ADIM pin is connected with hundreds of nF capacitors, the 5 CS 4 GND device will work at PWM-to-DC dimming mode. The dimming range is 1% to 100%. The AL1666 has rich protection features. It integrates multiple SO-8 (Standard) protections including Under Voltage Lock Out (UVLO), Output Over Voltage Protection (OVP), Output Short Circuit Protection (OSP), Over Current Protection (OCP), Winding Short Circuit, Secondary Diode Short, Internal Thermal Fold-Back Protection (TFP) and Over Applications Temperature Protection (OTP). General LED Lighting Driver with Dimming Function 0 to 10V Dimming Luminaires The AL1666 is available in SO-8 (Standard) package. General Purpose Constant Current Source Smart LED Lighting Features Primary Side Regulation without Opto-Coupler Valley Switching for Low Switching Loss Support Analog and PWM-to-DC Dimming Analog/PWM-to-DC Dimming Range: 1% to 100% Tight CS Reference Voltage 0.4V1.5% High PF>0.9 and Low THD<20% High Efficiency Internal Protections Under Voltage Lock Out (UVLO) Output Over Voltage Protection (OVP) Output Short Protection (OSP) Over Current Protection (OCP) Winding Short Circuit Protection Secondary Diode Short Protection Internal Thermal Fold-back Protection (TFP) Over Temperature Protection (OTP) Tight LED Current Variation Range LED Current Line Regulation: 2% (90V to 305V ) AC AC LED Current Load Regulation: 2% Full Load to Half Load 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. AL1666 Typical Applications Circuit C7 R14 T1 L1 D3 + OUT R11 R10 C5 R C6 TH C1 C2 F1 D2 AC VR1 Input Aux R4 D1 PWM Signal DB1 C VCC D4 R5 VCC PWMD Q1 FB OUT AL1666 R9 COMP R6 CS ADIM GND R COMP U1 R CS CCOMP C DIM Flyback Application Circuit L1 T1 OUT C2 R R11 C6 C1 TH F1 D3 AC VR1 Input Aux R4 D1 PWM Signal DB1 CVCC D4 R5 VCC PWMD Q1 FB OUT AL1666 R9 COMP R6 CS ADIM GND R COMP R C C CS COMP DIM Buck-Boost Application Circuit Pin Descriptions Pin Number Pin Name Function 1 ADIM Analog dimming input pin 2 PWMD PWM signal 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 AL1666 December 2019 Diodes Incorporated www.diodes.com Document number: DS42417 Rev. 1 - 2 NEW PRODUCT +