Onsemi NCL30083

Description

The NCL30083 is a PWM current mode controller targeting isolatedflyback and non−isolated constant current topologies. The controlleroperates in a quasi−resonant mode to provide high efficiency. Thanksto a novel control method, the device is able to precisely regulate aconstant LED current from the primary side. This removes the needfor secondary side feedback circuitry, biasing and an optocoupler.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 spaceefficient designs. It supports step dimming by monitoring the AC lineand detecting when the line has been toggled on−off−on by the user toreduce the light intensity in 5 steps down to 5% dimming.

Features

• Quasi−resonant Peak Current

−mode Control Operation

• Primary Side Sensing (no optocoupler needed)
• Wide VCC Range
• Source 300 mA/Sink 500 mA Totem Pole Driver with 12 V Gate Clamp
• Precise LED Constant Current Regulation ±1% Typical
• Line Feed−forward for Enhanced Regulation Accuracy
• Low LED Current Ripple
• 250 mV ±2% Guaranteed Voltage Reference for Current Regulation
• ~ 0.9 Power Factor with Valley Fill Input Stage
• Low Start−up Current (13 A typ.)
• 5 State Quasi−log Dimmable
• Thermal Fold−back
• Programmable soft−start
• Wide Temperature Range of −40 to +125°C
• Pb−free, Halide−free MSL1 Product
• Over Voltage / LED Open Circuit Protection
• Over Temperature Protection
• Secondary Diode Short Protection
• Output Short Circuit Protection
• Shorted Current Sense Pin Fault Detection
• Latched and Auto−recoverable Versions
• Brown−out
• VCC Under Voltage Lockout
• Thermal Shutdown

Typical applications

• LED Light Engines
• LED Power Driver Supplies
• Integral LED Bulbs

More information

• Datasheet
• IC product information