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Three Channel LED Driver IC Features Closed-Loop Control of Output Current

Fri, 09/28/2007 - 8:17am

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e_arrows.jpgsupertex_hv9982_WEB.jpgSupertex introduced the HV9982 three channel LED driver IC designed to provide high LED current accuracy through closed-loop control of the output currents. It is designed for applications using RGB LED backlighting or multiple strings of white LEDs. The device employs a fixed frequency, closed-loop, current mode control architecture that ensures stable operation over a wide range of input and output voltages. Its high-side current sensing allows it to be used in buck, boost or SEPIC configurations while delivering ±1 percent current accuracy between strings. It features an internal 40V linear regulator providing an 8V power supply to the IC. The IC utilizes an internal control with an external clock source to facilitate synchronization. Each channel can drive a LED string of up to 200V, with efficiency greater than 90 percent. The output current range of each channel is user-programmable with an external sense resistor and can be individually dimmed using either linear or PWM dimming. Three built-in disconnect FET drivers enable high PWM dimming ratios. Programmable slope compensation allows for synchronization and greater than a 50 percent duty cycle in fixed frequency operation. The IC also includes hiccup mode and is available in a 40-lead QFN package (HV9982K6-G). The part is
Green and RoHS compliant. Samples are available from stock. Lead-time for production quantities is 4 to 6 weeks ARO. Pricing is $3.03 each for the HV9982K6-G in 1K quantities.
Supertex
408-222-8888, www.supertex.com 

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