ISL97676

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The ISL97676 is an LED driver that drives six channels of LED current for TFT-Display. The ISL97676 drives six 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 supply on the ISL97676 VIN pin. The ISL97676 compensates for non-uniformity of the forward voltage drops in the LED strings with its 6 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 the typical multi-string operation. Intersil offers two PWM Dimming modes. In the first mode, the ISL97676 digitizes the incoming PWM signal and provides 8-bit dimming. The PWM frequency is set by a resistor providing dimming frequency between 100Hz to 30kHz. The second mode offers direct PWM mode without phase shift, where the dimming follows the input PWM signal. The ISL97676 features channel phase shift control to minimize the input, output ripple characteristics and load transients as well as spreading the light output to help eliminate or reduce the video and audio noise interference from the backlight driver operation.