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TPS61165 and Lcd backlight flickering

Other Parts Discussed in Thread: DM3730, TPS61165

6052.backlight_pwm.pdf

Hi,all
   platform:DM3730
   OS:WINCE 6.0
   Backlight Driver IC:TPS61165
  
   I used GPMC_nCS5(a pad in DM3730) to implement PWM LCD backlight Brightness control. when I waked up my systerm afte suspending,the LCD backlight flicker for a moment,
 but the LCD backlight will stop flickering after a period of time. i.e. The LCD backligth would be  ok as long as I don't suspended and waked up the systerm. I checked the
 pwm signal by Oscilloscope,The pwm signal was normal.my design has been attached here(i.e. backlight_pwm.pdf), who can  give me some ideas? why the LCD flicker?