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Products, Materials + Tools | Jul 13, 2009

High Accuracy LED Driver Without High-Side Current Sensing

Supertex, Inc. (NasdaqGS: SUPX) introduced the HV9961, an average-mode, constant control LED driver integrated circuit (IC) designed to drive LEDs using a buck topology. It is well suited for a variety of solidstate lighting applications.
Features:
• Fast average current control
• Programmable constant off-time switching
• Linear dimming input
• PWM dimming input
• Output short circuit protection with skip mode
• Ambient operating temperature -40OC to +125OC
• Pin-compatible with the HV9910B
  
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
  
The HV9961 provides current accuracy of +/-3% and requires no loop compensation or high-side current sensing because of Supertex’s proprietary averagemode control scheme. The IC features hiccup-mode LED short-circuit protection and both linear and PWM dimming.
   
“The HV9961 employs a novel circuit architecture to achieve fast and accurate output current control,” states Ahmed Masood, Vice President of Marketing at Supertex. “With its wide input voltage range, this device is well suited for a host of LED lighting applications such as street, architectural, decorative, and industrial, as well as backlighting LCD screens.”
The HV9961 is available in SOIC-8 and SOIC-16 packages (HV9961LG-G and HV9961NG-G, respectively) and is pin-compatible with Supertex’s HV9910B LED driver. The parts are Green and RoHS compliant. Samples of the HV9961LG-G are available from stock. Samples of the HV9961NG-G will be available in 3 weeks. Leadtime for production quantities is 4-6 weeks ARO. Pricing is US$1.40 for the HV9961LGG and US$1.49 for the HV9961NG-G, each 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, imaging, industrial, and telecommunication markets. Supertex product, corporate and financial information is readily available at www.supertex.com.
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