ON Semiconductor Is Now To learn more about onsemi, please visit our website at www.onsemi.com onsemi andand other names, marks, and brands are registered and/or common law trademarks of Semiconductor Components Industries, LLC dba onsemi or its affiliates and/or subsidiaries in the United States and/or other countries. onsemi owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of onsemi product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent-Marking.pdf. onsemi reserves the right to make changes at any time to any products or information herein, without notice. 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Should Buyer purchase or use onsemi products for any such unintended or unauthorized application, Buyer shall indemnify and holdo nsemi and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that onsemi was negligent regarding the design or manufacture of the part. onsemi is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner. Other names and brands may be claimed as the property of others. Power Factor Corrected Quasi-Resonant Primary Side Current-Mode Controller for LED Lighting Below 25 W www.onsemi.com NCL37733 The NCL37733 is a compact driver for powerfactor corrected flyback and nonisolated buckboost and SEPIC converters. The controller operates in a quasiresonant mode to provide optimal 1 efficiency, and embeds a proprietary control method which allows the LED current to be tightly regulated from the primary side, thus TSOP6 CASE 318G02 eliminating the need for a secondaryside feedback circuitry and for an optocoupler. Housed in a TSOP6 package, the device is highly integrated with a MARKING DIAGRAM minimum number of external components. A robust suite of safety protection is built in to simplify the design. This device is specifically intended for very compact space efficient designs. 2T4AYW Features 1 Quasiresonant Peak Currentmode Control Operation 2T4 = Specific Device Code Constant Current Control with Primary Side Feedback A =Assembly Location Tight LED Constant Current Regulation of 2% typical Y = Year NearUnity Power Factor (>0.95 typically) W = Work Week = PbFree Package Optimized for Line Widerange Applications (Note: Microdot may be in either location) Line Feedforward for Enhanced Regulation Accuracy Low Startup Current (10 A typ.) Wide V Range CC PIN CONNECTIONS 100 mA / 150 mA Totem Pole Driver with 12 V Gate Clamp CS/ZCD 1 6 DRV Robust Protection Features OVP on V GND 2 5 V CC CC Programmable Over Voltage / LED Open Circuit Protection COMP 3 4 V S Cycle by cycle peak current limit Winding Short Circuit Protection Secondary Diode Short Protection ORDERING INFORMATION Output Short Circuit Protection Device Package Shipping Thermal Shutdown NCL37733BSNT1G TSOP6 3000 / Tape V Undervoltage Lockout CC (PbFree/ & Reel BrownOut Detection Halide Free) PbFree, HalideFree MSL1 Product For information on tape and reel specifications, including part orientation and tape sizes, please Typical Application refer to our Tape and Reel Packaging Specification Integral LED Bulbs and Tubes below 25 W Brochure, BRD8011/D. LED Drivers / Power Supplies below 25 W Semiconductor Components Industries, LLC, 2020 1 Publication Order Number: September, 2020 Rev. 0 NCL37733/D