NCL30085 Power Factor Corrected Quasi-Resonant Primary Side Current-Mode Controller for LED Lighting with Line Step Dimming and Thermal Foldback
The NCL30085 is a power factor corrected flyback controller targeting isolated and non-isolated constant current LED drivers. The controller operates in a quasi-resonant mode to provide optimal efficiency. Thanks to a novel control method, the device is able to tightly regulate a constant LED current from the primary side. This removes the need for secondary side feedback circuitry, biasing and an optocoupler. The device is highly integrated with a 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 and supports 3 levels of log step dimming which allows light output reduction by toggling the main AC switch on and off to signal the controller to reduce the LED current point down to 5% of full load.
Features www.onsemi.com
8 1 SOIC-8 NB CASE 751 MARKING DIAGRAM
8 L30085x ALYW G 1 L30085x = Specific Device Code x = A, B A = Assembly Location L = Wafer Lot Y = Year W = Work Week G = Pb-Free Package Quasi-resonant Peak Current-mode Control Operation Constant Current Control with Primary Side Feedback PIN CONNECTIONS Tight LED Constant Current Regulation of ±2% Typical 1 VCC ZCD Power Factor Correction DRV VS 3 Step Dimming (70/25/5%) Line Feedforward for Enhanced Regulation Accuracy GND COMP Low Start-up Current (10 mA typ.) CS SD Wide Vcc Range (Top View) 300 mA / 500 mA Totem Pole Driver with 12 V Gate Clamp Robust Protection Features ORDERING INFORMATION OVP on VCC See detailed ordering and shipping information in the package dimensions section on page 26 of this data sheet. Programmable Over Voltage / LED Open Circuit Protection Cycle-by-cycle Peak Current Limit Winding Short Circuit Protection Secondary Diode Short Protection Pb-Free, Halide-Free MSL1 Product Output Short Circuit Protection Typical Applications Current Sense Short Protection Integral LED Bulbs and Tubes User Programmable NTC Based Thermal Foldback Thermal Shutdown LED Light Engines Vcc Undervoltage Lockout LED Drivers/Power Supplies Brown-out Protection © Semiconductor Components Industries, LLC, 2015 1 February, 2015 - Rev. 2 Publication Order Number: NCL30085/D NCL30085 .
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Figure 1. Typical Application Schematic for NCL30085 Table 1. PIN FUNCTION DESCRIPTION
Pin No 1 2 Pin Name ZCD VS Function Zero Crossing Detection Input Voltage Sensing Pin Description Connected to th …
