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LP8556 / maxmimu current without I2C control

Ryuji
Guru 20090 points
Other Parts Discussed in Thread: LP8556
Hello,
 
I searching LED drriver IC of below conditions and I found LP8556.
<Conditions>---------------------
VIn: 11V ~ 16.8V
Vout: 21V
Iout : 50mA/ch , 4ch
Dimming : PWM
Fsw : about 600kHz
Don't need I2C control.
-----------------------------------------
 
I think that LP8556 maximum output current without I2C control is 46mA/ch by  LP8556-E08.
LP8556-E08 Imax is 23mA and ISET_EN=1 and CURRENT register "FFFh".
So, I user 12korms as Rised, we can use 46mA/ch by default value.
Is my understanding correct ?
 
If there is other appropriate device, please let me know.
 
Best Regards,
Ryuji Asaka
  • 0
    Guru 20090 points
    Hello,
     
    Sorry for bothering you.
    But , My customer  need reply urgently.
    So , could you please kindly let me know the information within today ?
     
    If you need more information , please let me know.
     
    Best Regards,
    Ryuji Asaka
  • 0
    TI__Expert 8165 points

    Hi Ryuji,

    All existing LP8556 device options are optimized for 25 mA/CH or less.  While you may use the RISET to adjust the current up or down from the nominal ILED of 23mA for the LP8558-E08, the Vheadroom settings  can only support up to 25mA/CH.  Supporting 50 mA/CH requires optimazing the DRIVER_HEADROOM (register AAh) and HEADROOM_OFFSET (register 9Eh) settings.  Overriding the existing settings (or EPROM defaults) requires system's ability to send I2C commands. If the I2C is not available in the system, a new device option may be requested.

    Regards,

    Davor

  • 0 in reply to Davor Glisic
    Genius 5355 points

    Hi Davor,

    "If the I2C is not available in the system, a new device option may be requested."

    Is there a way we get a device option capable of 50mA? Pre-programmed?

    Thanks.

  • 0 in reply to ikon
    Genius 5355 points

    Hi Davor,

    Could you advise the soonest?

    Thanks.

  • 0 in reply to ikon
    TI__Expert 8165 points
    Hi-

    I'm sorry for the delay.

    A new device option pre-programmed for 50mA/CH support requires involvement of a development team. I suggest contacting your sales representative who can request a new device option.

    Regards,
    Davor