Hi,
Our customer's tablet project using LM36274 as the LED backlight driver. During the testing, it was found that the power consumption was too large. The specific description is as follows:
In the flight mode, the current measured under the maximum brightness condition is 624mA, the minimum bright screen condition is 77.18mA, and the current measured under the condition that the screen is not lit is 13mA. Therefore, it can be calculated that the power consumption of the screen is about 546.82mA (624-77.18mA). That is too large for tablets.
The schematic diagram of LM36274 is as follows.
The corresponding register settings are as follows.
lcd_write_byte(0x0D,0x1E); MDELAY(1); lcd_write_byte(0x0E,0x1E); MDELAY(1); lcd_write_byte(0x09,0x99); MDELAY(1); lcd_write_byte(0x03,0x07); MDELAY(1); lcd_write_byte(0x02,0x69); MDELAY(1); lcd_write_byte(0x08,0x1F);
So our customer want to know how to set the maximum current of the backlight LED. Can u give us some suggestion for this problem?
Thanks,
Kind Regards.
Lumina
