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TPS65217B WLED driver circiut

Hi,

I want to use the internal WLED driver of PMIC TPS65217B . WLED Boost regulator is capable of providing upto 39V,25mA each LED string(Two strings can be used)

I am using a 3.5" LCD which requires 19.8V backlight voltage with 20mA of current . ISET pins are set to required current using resistors. (18uH inductor is used for switching)

Is that boost regulator a current mode PWM regulator that will take care of backlight voltage required by LCD depending on current set by resistor ??

Or is it neceesary to set the backlight voltage externnally ?? If yes how to do this as feedback (FB_WLED) pin voltage need to be set is not mentioned in datasheet??

Immediate reply is appreciated.

Thanks,

Usha