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BackLight Driver recommendations

Chaitanya Cherukuri
Prodigy 40 points
Other Parts Discussed in Thread: LM3533, LM3630, LM3695, LM3532, LP8556, TPS61165

Hi All,

Can anyone suggest me any suitable solution for following back-light driver configuration

For Display 3.5" (Kyocera High Brightness Display)It has 2 string of 6 LED's each and need 15mA/Channel current @ 25V.

Early reply will be highly appreciable.

 

Regards

Chaitanya

  • TI__Intellectual 1040 points

    Chaitanya,

    We have a number of products that can fit this need.  First, look at the LM3630.  This is a dual backlight driver that does exactly what you are looking for.  It has 8 bit dimming, I2C and PWM brightness control.  If they need more tightly matched currrent sinks, then look at the LM3695.  This has 11 bit dimming and I2C brightness control (no PWM).  If they need indicator LED drive capabilities also, look at the LM3533.  This is a dual string backlight + 5 indicator LED drivers.

    Thanks

    Travis 

     

     

  • in reply to Travis Eichhorn
    Prodigy 40 points

    Travis,


    Thank you very much for this information. LM3630 and LM3533 both meet our requirements,attractive feature of LM3533 is Ambient Light Sensor. I have a simple question regarding LM3533, If I don't want to use the Low voltage LED (LVLED1-LVLED5) can I just connect them to ground?


    Thanks,

    Chaitanya

  • in reply to Chaitanya Cherukuri
    TI__Intellectual 1040 points

    Chaitanya,

    You can either connect them to GND or leave them floating.  The default for these is disabled and they would require enabling through I2C.   Also you don't need the CPOUT cap and the flying cap between C- and C+ if you do not use the LVLEDs.

    One other part I didn't mention since it is a three string driver is the LM3532.  This is basically the LM3533 with an extra current sink and no indicator LEDs.  The unused current sink can be left floating.  This might be the best option for you if you need the ambient light sensor input.

    Thanks

    Travis

  • in reply to Travis Eichhorn
    Prodigy 40 points

    Travis,


    thank you for this info.

    Sorry to bother you again, Coulf you suggest me a back-light driver with following:

    1. dual channel, upto 100mA per current sink, output voltage 30V

    2. I2C and PWM brightness control

    3. Ambient Light sensor

    on your website I can only see 1 channel devices with output current of 100mA.

    Thank you in advance,

    Chaitanya

  • in reply to Chaitanya Cherukuri
    TI__Intellectual 1040 points

    Chaitanya,

     

    The best one we have is the LM3532 with the ambient light sensor input.  This can only get up to 30mA per channel.  We do have others that have more current (LP8556), but no ALS.

     

    Thanks

    Travis 

  • in reply to Travis Eichhorn
    Prodigy 40 points

    Travis,

    I just received updated information about the display that I'll be using. My requirements are:

    1. Single channel (Typ:60mA , max100mA) @ 26V~30V

    2. PWM Brightness control and I2C Interface

    on TI website I found TPS61165. Could you please recommend any other driver solutions?

    Thanks,

    Chaitanya