LED Driver IC drives LEDs using buck topology.November 8, 2011 -
Employing average current mode control, Model HV9861A does not produce peak-to-average error, optimizing accuracy and line/load regulation of LED current. Unit requires no loop compensation or high-side current sensing. With internally regulated voltage of 7.5 V, it is suited for variety of solid-state lighting applications, including TV and monitor backlighting, signage, decorative, and general lighting. HV9861A is available in SOIC-8 and SOIC-16 packages.
(Archive News Story - Products mentioned in this Archive News Story may or may not be available from the manufacturer.)
Original Press release
Supertex Inc.
1235 Bordeaux Dr.
Sunnyvale, CA, 94619
USA
Patented LED Driver from Supertex Delivers High Current Accuracy Via Average Mode Control
HV9861A Achieves High Accuracy Without High-Side Current Sensing
SUNNYVALE, Calif., - Supertex, Inc. (Nasdaq GS: SUPX) today introduced HV9861A, an open loop, average current mode control, LED driver integrated circuit (IC) designed to drive LEDs using a buck topology. It is well suited for a variety of solid-state lighting applications, including TV and monitor backlighting, signage, decorative, and general lighting.
Because of the patented, novel scheme of current control it employs, HV9861A doesn't produce a peak-to-average error like many LED driver ICs, and therefore, it greatly improves the accuracy and line and load regulation of the LED current. The IC provides typical current accuracy of +/-3% and requires no loop compensation or high-side current sensing because of its proprietary control scheme. The internally regulated voltage (Vdd) for HV9861A is 7.5V.
"By utilizing Supertex's patented average-mode current sensing technology, HV9861A achieves fast and accurate LED current control in a wide variety of LED lighting applications," states Stephen Lin, Vice President of Marketing at Supertex. "The extremely accurate current control of this IC serves to prolong the lifetime of LEDs, thus making it well suited for manufacturers seeking durability and reliability in their end LED products."
HV9861A is available in SOIC-8 and SOIC-16 packages (HV9861ALG-G & HV9861ANG-G, respectively) and are pin-compatible with Supertex's HV9910B and HV9961 LED drivers. The parts are RoHS compliant. Samples are available from stock. Lead-time for production quantities for the HV9861A is 4-6 weeks ARO. Pricing is US$0.81 for the HV9861ALG-G, US$0.89 for the HV9861ANG-G, in 1K quantities.
About Supertex
Supertex, Inc. is a publicly held mixed signal semiconductor manufacturer, focused in high voltage analog and mixed signal products for use in the medical, LED lighting, printer and display, industrial and telecommunication industries. Supertex product, corporate and financial information is readily available at www.supertex.com.
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