Quasi-Resonant Primary Side Current-Mode Controller for LED Lighting

The NCL30080 is a PWM current mode controller targeting isolated flyback and non-isolated constant current topologies. The controller operates in a quasi-resonant mode to provide high efficiency. Thanks to a novel control method, the device is able to precisely 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 wide Vcc range simplifies the design process and allows a single design to support a wide LED forward voltage range. A robust suite of safety protection is built in to simplify the design. This device is specifically intended for very compact space efficient designs

Features
• Quasi-resonant Peak Current-mode Control Operation
• Primary Side Sensing (no optocoupler needed)
• Wide Vcc Range
• 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 LED Current Ripple
• Source 300 mA / Sink 500 mA Totem Pole Driver with 12 V Gate Clamp
• Low Start-up Current (13 uA typ.)
• Small Space Saving Low Profile Package
• Wide Temperature Range of-40 to +125°C
• Pb-free, Halide-free MSL1 Product
• Robust Protection Features
- Over Voltage / LED Op|en Circuit 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
• Integral LED Bulbs
• LED Power Driver Supplies
• LED Light Engines