Microchip Technology, Inc. Sequential Linear LED Driver with Four Taps CL88020

The CL88020 LED Driver Integrated Circuit (IC) is an off-line sequential linear LED driver designed to provide 8.5W of LED power from a 120 VAC nominal input voltage. CL88020 is designed to drive a long string of inexpensive, low-current LEDs directly from the AC mains. A basic driver circuit consists of Microchip Technology Inc.’s CL88020 LED driver IC, six resistors and a bridge rectifier. Two to four additional components are optional for various levels of transient protection, also with a low-cost NTC to assure remote over-temperature protection (OTP). No capacitors, EMI filters, or power factor correction circuits are needed unless the optional reduced light output ripple feature is desired. Additional Features Optimized for 120 VAC Nominal Input Voltage 120 VAC ± 15% input voltage Targeted for 8.5W Output Power Programmable Overtemperature Protection Provides Gradual Reduction in Light Output with Increasing Temperature Active Line Regulation Provides Fairly Constant Output Power over Variations in AC Line Voltage Typical Line Regulation of –12% to +0% Four Taps with Two Current Set Resistors Allows Optimization of THD Optional Reduced Light Output Ripple Provides Continuous Power to the LED Eliminates Strobing Uses an External Ceramic Storage Capacitor TRIAC Dimmer Compatible Available in a Thermally Enhanced 8-Lead SOIC Package with Heat Slug Larger Creepage Distances between HighVoltage and Low Voltage Pins