IC drives long LED strings
Intended to minimize driver circuit component count, the CL88020 allows for a single-layer PCB design. Just six resistors and a bridge rectifier are required to form a basic driver circuit capable of providing 8.5 W of LED power. Two to four additional components are optional to achieve various levels of transient protection, while an NTC thermistor ensures remote overtemperature protection. No capacitors, EMI filters, or power-factor circuits are required, unless reduced output ripple is desired.
A string of series/parallel LEDs is tapped at four locations. Four linear current regulators sink current at each tap through a single control point and are sequentially turned on and off. High efficiency is achieved by shutting off upstream regulators when downstream regulators achieve regulation.
Housed in an SOIC-8 package, the CL88020 LED driver is available for sampling and in volume production with prices starting at $0.93 each in lots of 10,000 units.
CL88020 product page
Microchip Technology, www.microchip.com
Find more datasheets on products like this one at Datasheets.com, searchable by category, part #, description, manufacturer, and more.