The ISL97673 is a 6-Channel 45V dual dimming capable LED driver that can be used with either SMBus/I2C or PWM signal for dimming control. The ISL97673 drives 6 channels of LED to support 78 LEDs from 4. 5V to 26V or 48 LEDs from a boost supply of 2. 7V to 26V and a separate 5V bias on the ISL97673 VIN pin. The ISL97673 compensates for non-uniformity of the forward voltage drops in the LED strings with its six voltage controlled-current source channels. Its headroom control monitors the highest LED forward voltage string for output regulation, to minimize the voltage headroom and power loss in a typical multi-string operation. The ISL97673 features optional channel phase shift control to minimize the input, output ripple characteristics, and load transients, as well as spreading the light output to help reduce video and audio interference from the backlight driver operation. The phase shift can be programmed with equal phase angle or adjustable in 7-bit resolution. The ISL97673 has a full range of dimming capabilities that include SMBus/I2C controlled PWM dimming or DC dimming. Another key feature of the ISL97673 is that it allows very linear PWM dimming from 0. 4% to 100% of up to 30kHz. Current matching of 0. 4% to 100% dimming achieves ±1% tolerance from 100Hz to 5kHz dimming and ±3% tolerance from 5kHz to 30kHz dimming.
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