Supertex has released a family of three LED driver ICs, the CL320, CL325, and CL330, each consisting of three channels of constant current output, designed to drive three LED strings at currents of 20 mA, 25 mA, and 30 mA each, respectively. Each part comes in an 8-lead, power SOIC package. The only external component required is a single ceramic bypass capacitor, making the PCB designs extremely simple, and the same capacitor may be shared with several drivers. Separate Enable pins for each channel allow pulse width modulated (PWM) dimming, three-step linear dimming, or individual disconnection of any faulty LED string. Over-temperature protection circuitry shuts down all channels when the die temperature reaches 135°C, with normal operation resuming when the die temperature drops by 30°C. The parts feature a 90 V standoff voltage and a fixed drive current with a ±6% tolerance over a VOUT range of 4 to 15 V. They are specifically designed for applications in low cost LED backlighting LCD panels, indicator lamps, decorative lights as well as general lighting.
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Opto-Electronics
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