Products, Materials & Tools | Oct 28, 2011

Patented HV9861A Achieves High Accuracy Via Average Mode Control

Supertex, Inc. 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.

Features:
• Fast average current control
• Programmable constant off-time switching
• PWM / linear dimming input
• Output short circuit protection with skip mode
• Ambient operating temperature -40OC to +125OC
• Pin-compatible with the HV9910B and HV9961

Applications:
• DC/DC or AC/DC LED driver applications
• LED backlight driver for LCD displays
• General purpose constant current source
• LED signage and displays
• Architectural and decorative LED lighting
• LED street 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 highside 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.

For additional information please download the datasheet.

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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