Supertex, a recognized leader in high voltage analog and mixed signal integrated circuits (ICs), today introduced HV9973 -- a patented, isolated, constant current LED driver for use in high voltage solid-state lighting applications such as incandescent bulb retrofits.
The IC achieves +/-3% current accuracy through patented primary side current sensing and has internal over voltage and short circuit protection. This sensing approach eliminates the need for secondary sensing components, thus reducing component count, circuit size and cost. The patented control technique also makes the output current setting insensitive to most component tolerances and parasitic without the need of an opto-coupler feedback.
HV9973 controls an isolated, flyback topology that meets UL requirements for galvanic isolation and operates from 280-400VDC.
"HV9973 utilizes a patented primary-side output control technique that maintains 3% control of the LED current setting and features tight line and load regulation," states Alex Mednik, Director of Applications Engineering for Supertex. "The IC also offers a logic input for dimming LED light output by low frequency pulse-width modulation of the output current."
HV9973 is available in a RoHS compliant 8-lead SOIC package (HV9973LG-G). Samples are available from stock. Lead-time for production quantities is 4-6 weeks ARO. Pricing is US$1.62 each for HV9973LG-G in 1K quantities.
