ROHM LCD backlight LED driver BD60910GU come out

ROHM Corporation has recently developed a series of 8 BD60910GU light, ultra bright LED backlight with automatic dimming function, which can drive the industry in series.

This new product has been supplied in January 2009 (sample price: 180 yen / USD), which will be produced on a large scale by the month of May 2009 at the scale of 500 thousand months. The production process in the process of Fukuoka ROHM Corporation (Fukuoka county), the latter process in ROHM Corporation (Hamamatsu Shizuoka) completed.

Mobile devices such as mobile phone, due to the installation of 1seg function and the time increasing function of the browser, so the battery life demand increases, in addition to the large screen LCD panel is high and clear direction. Therefore, the requirements of the LCD backlight LED backlight and low power consumption to ensure the corresponding function of the brightness of the screen. In order to achieve low power, according to the ambient light to automatic dimming function, but the traditional automatic dimming function of the white LED driver LSI, because most can only drive 7 lights, and 1 LED drives only support 3.5 inches in size, it is difficult to adjust the brightness of the big picture.

Traditional technology in the number of driving lights, due to the output terminal voltage and other technical factors, the mobile device applications can drive up to 7 lights. This time, the development of BD60910GU using high voltage components and digital circuit hybrid technology, can drive 8 backlight with white LED. In addition, Rohm using the original illuminance sensor control and PWM dimming function, to achieve low power consumption at the same time, due to the installation of double dimming function can make the display quality is improved, and according to the brightness around the brightness of the image content and adjust the most suitable, greatly reduce the power consumption.

In addition, according to the traditional automatic dimming around the luminous intensity of LED drive, most can only be applied to specific illuminance sensor output mode, the user will be restricted in the choice of LED driver IC program, and BD60910GU can output the corresponding Log output type illuminance sensor and linear type, so from the illuminance sensor output the limit can be used.

Moreover, resulting in the use of PWM to adjust light clutter, decrease communication sensitivity to mobile phone, for the noise caused by the variation of output voltage of tantalum capacitors in the circuit, the use of ferrite material and shielding insulation, while BD60910GU in PWM dimming the boost power control system using a minimal change in work the boost voltage fluctuation, reduce capacitor clutter and noise generation.

Product features:

1, the installation of a dimmer function to the industry more than 8 lamps in series drive

2 (Log) the output of the type of illumination sensor and linear output of the sensor can be used to connect all the illuminance sensor

3) ROHM illumination sensor IC (BH1621FVC) can be converted to gain control, can carry out a wide range of illuminance measurement

4, according to the ambient brightness to automatically adjust to the 8bit light and shade gradient (level 256) backlight current settings, reduce the discomfort of the eyes

5. Because of the minimum boost voltage fluctuation control system, the EMI noise can be reduced when the PWM dimming is implemented, and the stray noise generated by the capacitor can be reduced.