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Optoelectronics/Displays  

LED driver optimised for multiple strings backlight

Posted: 07 Jul 2009     Print Version  Bookmark and Share

Keywords:LED driver  LCD  backlight 

HV9985 LED driver

A new three-channel LED driver has been launched by high voltage analogue and mixed signal chip maker Supertex. The HV9985 provides high LED current accuracy through closed loop control of the output current. The IC is targeted to drive multiple strings of backlight or edgelight LEDs in LCD TVs.

The LED driver has three peak current mode controllers that provide feedback to the IC for efficiency and accuracy. Gate drivers within the chip are optimised for driving logic level FETs at 0.25A sourcing or 0.5A sinking. Each output current can be individually dimmed via linear or PWM dimming methods.

Ahmed Masood, VP of marketing for Supertex said, "The HV9985's closed loop system dynamically adjusts its output voltage for excellent line and load regulation of the LED current." He added that integrating three channels in a single package ensures better current matching between strings as well as reducing the total component count of the system.

The HV9985 is available in 40-lead QFN and 44-lead QSOP packages (HV9985K6-G and HV9985QP-G, respectively). The parts are Green and RoHS-compliant. Samples of the HV9985K6-G are available from stock. Samples of the HV9985QP-G will be available in three weeks. Lead-time for production quantities is four to six weeks ARO for the HV9985K6-G and six to eight weeks ARO for the HV9985QP-G. Pricing is Rs.96.99 ($1.98) each for the HV9985K6-G and Rs.112.67 ($2.30) for the HV9985QP-G, both in 1K quantities.





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