Troubleshooting LM3630A Backlight Driver IC Issues at Low Voltage
Discover solutions to LM3630A backlight driver IC issues at low voltage, including delayed I2C commands and operation checks at different battery voltages, ensuring optimal performance and functionality.
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Presentation Transcript
Backlight Driver IC Issue at Low Voltage 1) Issue : At Low Voltage (Battery voltage under 3.8V), LM3630A is not working during Booting. Does not work when booting start, but it works well after 10 seconds 2) Issue Improvement : delayed I2C command for 5us, it improved. LM3630 Schematic LM3630 Schematic
Backlight Driver IC Issue at Low Voltage 3) Battery LM3630A . +VPWR +VPWR +VPWR +VPWR VREG_WLED VREG_WLED VREG_WLED VREG_WLED LCD_BL_EN LCD_BL_EN LCD_BL_EN LCD_BL_EN I2C_data I2C_data I2C_data I2C_data +VPWR = 4V +VPWR = 4V +VPWR = 3.7V +VPWR = 3.7V - +VPWR 3.7V LM3630A output Voltage .(LM3630 .) - Power supply Battery , Drop over current Issue .
Backlight Driver IC Issue at Low Voltage 3) LM3630A Operation Check for each Battery Voltage VREG_WLED VREG_WLED VREG_WLED VREG_WLED LCD_BL_EN LCD_BL_EN LCD_BL_EN LCD_BL_EN I2C_clk I2C_clk I2C_clk I2C_clk I2C_data I2C_data I2C_data I2C_data +VPWR = 4V +VPWR = 4V +VPWR = 3.7V +VPWR = 3.7V - During I2C communication, Timing is the same and communicates well.
Backlight Driver IC Issue at Low Voltage 4) LM3630A Operation Check After SW change at +VPWR=3.7V +VPWR +VPWR +VPWR +VPWR VREG_WLED VREG_WLED VREG_WLED VREG_WLED LCD_BL_EN LCD_BL_EN LCD_BL_EN LCD_BL_EN I2C_data I2C_data I2C_data I2C_data I2C command 5us delay I2C command 5us delay Default Default - When I2C command transfer, LM3630A works well after 5us delay. - Both LM3630A timing is the same, but only 5us delayed works well.
Backlight Driver IC Issue at Low Voltage 4) LM3630A Operation Check After SW change at +VPWR=3.7V VREG_WLED VREG_WLED VREG_WLED VREG_WLED LCD_BL_EN LCD_BL_EN LCD_BL_EN LCD_BL_EN I2C_clk I2C_clk I2C_clk I2C_clk I2C_data I2C_data I2C_data I2C_data I2C command 5us delay I2C command 5us delay Default Default - I2C clock & data transfer timing also looks the same.
