NCL30085BDR2G ON Semiconductor

NCL30085 Power Factor Corrected Quasi-Resonant Primary Side Current-Mode Controller for LED Lighting www.onsemi.com with Line Step Dimming and Thermal Foldback 8 1 The NCL30085 is a power factor corrected flyback controller SOIC8 NB targeting isolated and nonisolated constant current LED drivers. The CASE 751 controller operates in a quasiresonant 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 MARKING DIAGRAM 8 removes the need for secondary side feedback circuitry, biasing and an L30085x optocoupler. ALYW The device is highly integrated with a minimum number of external components. A robust suite of safety protection is built in to simplify 1 the design. This device is specifically intended for very compact, space efficient designs and supports 3 levels of log step dimming L30085x = Specific Device Code x = A, B which allows light output reduction by toggling the main AC switch A = Assembly Location on and off to signal the controller to reduce the LED current point L = Wafer Lot down to 5% of full load. Y = Year W = Work Week Features = Pb-Free Package Quasiresonant Peak Currentmode Control Operation Constant Current Control with Primary Side Feedback PIN CONNECTIONS Tight LED Constant Current Regulation of 2% Typical 1 V ZCD CC Power Factor Correction VS DRV 3 Step Dimming (70/25/5%) Line Feedforward for Enhanced Regulation Accuracy GND COMP Low Startup Current (10 A typ.) SD CS Wide V Range cc (Top View) 300 mA / 500 mA Totem Pole Driver with 12 V Gate Clamp Robust Protection Features ORDERING INFORMATION OVP on V CC 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 Cyclebycycle Peak Current Limit Winding Short Circuit Protection Secondary Diode Short Protection PbFree, HalideFree 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 V Undervoltage Lockout cc LED Drivers/Power Supplies Brownout Protection Semiconductor Components Industries, LLC, 2015 1 Publication Order Number: April, 2015 Rev. 3 NCL30085/DNCL30085 . Aux NCL30085 1 8 2 7 3 6 45 R sense Figure 1. Typical Application Schematic for NCL30085 Table 1. PIN FUNCTION DESCRIPTION Pin No Pin Name Function Pin Description 1 ZCD Zero Crossing Detection Connected to the auxiliary winding, this pin detects the core reset event. 2 VS Input Voltage Sensing This pin observes the input voltage rail and protects the LED driver in case of too low mains conditions (brownout). This pin also observes the input voltage rail for: Power Factor Correction Valley lockout Step dimming 3 COMP Filtering Capacitor This pin receives a filtering capacitor for power factor correction. Typical values ranges from 1 4.70 F 4 SD Thermal Foldback and Connecting an NTC to this pin allows the user to program thermal current fold- Shutdown back threshold and slope. A Zener diode can also be used to pullup the pin and stop the controller for adjustable OVP protection. 5 CS Current Sense This pin monitors the primary peak current. 6 GND Controller ground pin. 7 DRV Driver Output The drivers output to an external MOSFET 8 V IC Supply Pin This pin is the positive supply of the IC. The circuit starts to operate when V CC CC exceeds 18 V and turns off when V goes below 8.8 V (typical values). After CC startup, the operating range is 9.4 V up to 26 V (V minimum level). CC(OVP) www.onsemi.com 2