for LED fail (normal/rare short/ short) To MCU Current Sense for LED fail (normal/rare short/ short) Clamp Diode For overvoltage In case LED is Open Vin=48V ( Or 24V) EN/UV VIN GATE1 CSP1 CSN1 BOOT1 VCC1 VLED1 Rsense1 Rsense2 Rsense3 White LED CH1 Only IF=700mA IF=1000mA IF=1050mA CH1+CH2 IF=350mA each IF=500mA each IF=525mA each CBOOT CVCC IF(Rsense) selection To MCU Overvoltage protection for LED is Open

Hello My customer had chosen TPS92518 for 2019 LED light, and the key feature is 0.1% dimming ratio. So, customer think [LEDx_PKTH_DAC] = 255 (the maximum value) for accuracy because we see description * in the data sheet p44. * " For the highest current set-point, set the peak threshold register to be as high as possible. Use [LEDx_PKTH_DAC] = 255 (the maximum value) if possible to increase the converter accuracy." On the other hand , they want change LED current 3 case in the same PCB. Attached ppt is block diagram . Q1 We don't know the relationship [LEDx_PKTH_DAC] = 255 (the maximum value) and accuracy for 0.1% dimming ration well. Do you suggest to use [LEDx_PKTH_DAC] = 255 (fixed) for 0.1% ratio ? ( Off course it should depends on PWM pulse resolution) Q2 If we fix [LEDx_PKTH_DAC] = 255, then we should change IF( Rsense resistor) using switch ..( Pls refer to ppt) Do you think this is okay in practical? Would you please have any idea to change IF value with 0.1% dimming ratio? Q3 Vin varies 48V and 24V in case by case . External components and resistor setting may be same for different Vin if frequency may be different? If Vin were changed, switching frequency should be changed for same TOFF, but not necessary to change inductor and register setting... right? But UVLO setting should be changed in d/s Fig 31. Q4 Would you please have your opinion about Over Current protection for LED short, Over voltage protection for LED Open and also IF( Rsense) changing about attached ppt kindly ?