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AL1677 Dataheets PDF



Part Number AL1677
Manufacturers Diodes
Logo Diodes
Description HIGH EFFICIENCY AND ACCURACY LED DRIVER CONVERTER
Datasheet AL1677 DatasheetAL1677 Datasheet (PDF)

NEW PRODUCT AL1677 UNIVERSAL, HIGH EFFICIENCY AND ACCURACY LED DRIVER CONVERTER Description The AL1677 is a universal AC-input (85~277 VAC), high-efficiency and high-accuracy Buck LED-driver converter. The AL1677 topology provides accurate constant current (CC) line and load regulation, operating at boundary conduction mode (BCM) to ease in EMI/EMC qualification and testing to meet the latest regulatory laws. The AL1677 system removes the auxiliary winding and external highvoltage MOSFET with .

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NEW PRODUCT AL1677 UNIVERSAL, HIGH EFFICIENCY AND ACCURACY LED DRIVER CONVERTER Description The AL1677 is a universal AC-input (85~277 VAC), high-efficiency and high-accuracy Buck LED-driver converter. The AL1677 topology provides accurate constant current (CC) line and load regulation, operating at boundary conduction mode (BCM) to ease in EMI/EMC qualification and testing to meet the latest regulatory laws. The AL1677 system removes the auxiliary winding and external highvoltage MOSFET with few external components to create a low bill of material (BOM) cost solution. The AL1677 has rich protection features to enhance system safety and reliability. With thermal foldback function, the AL1677 can reduce output current when the driver’s temperature is higher than the setting value. Pin Assignments (Top View) GND 1 ROVP 2 NC 3 VCC 4 8 CS 7 CS 6D 5D SO-8 The AL1677 is available in SO-8 package. Features  > 90% Efficiency  Valley Detection to Minimize Switching Loss  Universal 85 to 277 VAC Input Range  Internal MOSFET up to 500V  Tight Current Sense Tolerance : ± 3%  Low Startup Current: 170µA  Low Operation Current: 100µA (Static)  Standard Inductor (no auxiliary winding)  Internal Protections - Undervoltage Lockout (UVLO) - Leading-Edge Blanking (LEB) - Cycle-by-cycle Overcurrent Protection(OCP) - Output Open/Short Protection(OVP/OSP) - Open-Load and Reload Detection - Thermal Foldback Function(TFP) - Over-Temperature Protection(OTP)  SO-8 Package  Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)  Halogen and Antimony Free. “Green” Device (Note 3) Applications  Retrofit LED Lamps  High Voltage DC-DC LED Driver  General Purpose Constant Current Source Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. 2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and Lead-free. 3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and <1000ppm antimony compounds. AL1677 Document number: DS37526 Rev. 1 - 2 1 of 13 www.diodes.com November 2015 © Diodes Incorporated NEW PRODUCT Typical Applications Circuit AC Input F1 DB1 C1 R1 D1 R4 + C3 OUT L1 R2 C2 R3 4 VCC D 5 3 NC 6 D 2 ROVP CS 7 1 GND CS 8 U1 AL1677 R5 Pin Descriptions Pin Number 1 2 3 4 5,6 7,8 Pin Name GND ROVP NC VCC D CS Ground Setting the Open Voltage of the Output No Connection Power Supply for the Device Internal High Voltage MOSFET’s Drain Current Sensing Function AL1677 Functional Block Diagram VCC 4 STOP Fault Management OVP OSP OTP OFF UVLO VCC Management VCC Clamp VOVP_REF VREF 2 ROVP NC 3 OVP OVP TOFF VOVP_REF S R Q OSP TOFF Toff Detection (ZCD) 1 GND STOP Constant Current Control Max Ton Limit LEB 5,6 D 7,8 CS AL1677 Document number: DS37526 Rev. 1 - 2 2 of 13 www.diodes.com .


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