Onsemi NCL30085

Description

The NCL30085 is a power factor corrected flyback controllertargeting isolated and non−isolated constant current LED drivers. Thecontroller operates in a quasi−resonant mode to provide optimalefficiency. Thanks to a novel control method, the device is able totightly regulate a constant LED current from the primary side. Thisremoves the need for secondary side feedback circuitry, biasing and anoptocoupler.

The device is highly integrated with a minimum number of externalcomponents. A robust suite of safety protection is built in to simplifythe design. This device is specifically intended for very compact,space efficient designs and supports 3 levels of log step dimmingwhich allows light output reduction by toggling the main AC switchon and off to signal the controller to reduce the LED current pointdown to 5% of full load.

Features

• Quasi−resonant Peak Current−mode Control Operation
• Constant Current Control with Primary Side Feedback
• Tight LED Constant Current Regulation of ±2% Typical
• Power Factor Correction
• 3 Step Dimming (70/25/5%)
• Line Feedforward for Enhanced Regulation Accuracy
• Low Start−up Current (10 A typ.)
• Wide Vcc Range
• 300 mA / 500 mA Totem Pole Driver with 12 V Gate Clamp
• Robust Protection Features
• OVP on VCC
• Programmable Over Voltage / LED Open Circuit Protection
• Cycle−by−cycle Peak Current Limit
• Winding Short Circuit Protection
• Secondary Diode Short Protection
• Output Short Circuit Protection
• Current Sense Short Protection
• User Programmable NTC Based Thermal Foldback
• Thermal Shutdown
• Vcc Undervoltage Lockout
• Brown−out Protection
• Pb−Free, Halide−Free MSL1 Product

Typical applications

• LED Light Engines
• Integral LED Bulbs and Tubes
• LED Drivers/Power Supplies

More information

• Datasheet
• IC product information