High-Efficiency CCFL Backlight Controller
MAX8709B
High-Efficiency CCFL Backlight Controller with SMBus Interface
General Description
The MAX8709B integrated b...
Description
MAX8709B
High-Efficiency CCFL Backlight Controller with SMBus Interface
General Description
The MAX8709B integrated backlight controller is optimized to drive cold-cathode fluorescent lamps (CCFLs) using a resonant full-bridge inverter architecture. The resonant operation maximizes striking capability and provides near-sinusoidal waveforms over the entire input range to improve CCFL lifetime. The controller operates over a wide input voltage range of 4.6V to 28V with high power-to-light efficiency. The device also includes safetyfeatures that effectively protect against many single-pointfault conditions including lamp-out and short-circuit faults.
The MAX8709B achieves 10:1 dimming range by “chop-
ping” the lamp current on and off using a digital pulse-
width-modulation (DPWM) method. The minimum DPWM
duty cycle of the MAX8709B is 12.5%. The brightness is
controlled with a 2-wire SMBus-compatible interface. The
device directly drives the four external N-channel power
MOSF...
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