Product Description

The TCS5317 is a high power and high efficiencyboost controller with 4-channel current sinker which isideal for large LCD backlighting applications.

TCS5317 uses current mode,fixed frequencyarchitecture which can clamp the inductor peak currenteach cycle. The switching frequency is programmableby an external frequency setting resistor. It drives anextemal MOSFET to boost up the output voltage froma 4.5V to 28V input supply. The TCS5317 regulatesthe current in each LED string to the programmedvalue set by an external current setting resistor. TheTCS5317 current matching can achieve 1.5% andregulation accuracy can reach +2%.

A 3uA shutdown current and 0.85V (LED@180mA)feedback voltage and Maximum 65V output allows forup to 18 high-power LEDs in series will greatlyimprove efficiency and reduce power dissipation.

The device supports pulse width modulation (PWM)brightness dimming. During digital PWM dimming.the WLED current is tumed on/off at the duty cycleand frequency determined by the PWM signal on thePWMI pin.

The TCS5317 integrated multiple protect functions,such as LED Open, LED Short, Output Over Voltage.Over thermal, Input Over Current, and Under VoltageLockout(UVLO),these protection will prevent theLCD backlight from damage.

TCS5317 is available in 16pin SOP and TSSOP (EP)packages.