Microchip Technology CL8801
Sequential Linear LED Driver
FEATURES
● Minimal Component Count (Base Configuration: CL8801 + Four Resistors + Diode Bridge)● No Magnetics, No Capacitors
● Up to 7.5W Output (13W with Heat Sink)
● >110 Lm/W using Efficient LEDs
● 85% Typical Electrical Efficiency
● >0.95 Power Factor
● <30% THD Line Current
● Low Conducted EMI without Filters
● 85% LED Luminous Utilization
● Phase Dimmer Compatible with an RC Network
APPLICATIONS
● Fluorescent Tube Retrofit● Incandescent and CFL Bulb Replacement
● General LED Lighting
GENERAL DESCRIPTION
The CL8801 is designed to drive a long string of inexpensive, low-current LEDs directly from the AC mains. A basic driver circuit consists of CL8801, four resistors and a bridge rectifier. Two to four additional components are optional for various levels of transient protection. No capacitors, EMI filters or power factor correction circuits are needed. A string of series/parallel LEDs is tapped at four locations. Four linear current regulators sink current at each tap and are sequentially turned on and off, thereby tracking the input sine wave voltage.