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Illumination & Displays

Freescale LED driver eliminates noise and visual artifacts

Freescale Semiconductor

Freescale Semiconductor has introduced the MC34845 LED driver with high-speed pulse width modulation (PWM) capability. This six-channel device is designed to allow LED backlights to operate at frequencies above the audible range, thereby eliminating noise issues and reducing visual artifacts. In addition, the driver's accuracy and flexibility offer display uniformity and a wide dimming range to further enhance end-user experiences.

The MC34845 LED driver is ideal for backlighting applications in notebook displays ranging in size from seven inches to more than 17 inches, as well as other applications that use multiple low-power LEDs, such as lighting products.

The high-speed LED driver supports up to 100 kHz PWM, with pulses down to 200ns. This performance is suitable for 1000:1 dimming range at 25 kHz with excellent linearity across the range, supporting imperceptible dimming steps. The driver is also very accurate, supporting ±2% current matching maximum across the operating range of -40 degrees C to +85 degrees C, which helps improve display uniformity. The outputs are driven using a single direct drive PWM input.

The high-speed LED driver supports up to 100 kHz PWM, with pulses down to 200ns. This performance is suitable for 1000:1 dimming range at 25 kHz with excellent linearity across the range, supporting imperceptible dimming steps. The driver is also very accurate, supporting ±2% current matching maximum across the operating range of -40 degrees C to +85 degrees C, which helps improve display uniformity. The outputs are driven using a single direct drive PWM input.

www.freescale.com/led