BD9267KUT ROHM [Rohm], BD9267KUT Datasheet - Page 24

• Manufacturer Part Number: BD9267KUT
• Description: White LED Diver for Backlight of Medium/Large-sized LCDs
• Manufacturer: ROHM [Rohm]

BD9267KUT
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
PWM dimmingoperation mode
PWM dimming operation mode (with abnormol detection function)
abnormal
Settings of PWM dimming operation mode
When you use the PWM dimming mode, please follow the sequence below.
Setting of PWM dimming
normal
・VSYNC=PWM dimming signal（Input the pulse signal for PWM dimming to VSYNC.）
・HSYNC=GND（Setting for abnormal detection）
① Input the power supply of VCC and DVDD.
② Launch the STB from L to H.
③ Input the pulse signal to VSYNC.
・ VSYNC: PWM dimming signal (To input a pulse for PWM dimming to VSYNC pin)
・ HSYNC: 4096 counts during 1cycle of VSYNC signal
②
Figure 22. Starting Sequence for PWM dimming2
Figure 21. Starting Sequence for PWM dimming1
②
③
24/28
STOP
Number of count
Number of count
The abnormal detected CH of LED
will be OFF, after VSYNC pulse
count of 12.
At the same time, ERR_DET output
to ERROR
(“ERRDET=L” is abnormal)
TSZ02201-0F1F0C100050-1-2
Control the PWM operation of
LED output with PWM signal
inputted to VSYNC.
※Because the protection
functions are masked, the
lighting by LED abnormal
cannot proceed.
03.Aug.2012 Rev.001
Datasheet