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WLED driver for 7" LCD

Calvin Chan
Prodigy 50 points

Other Parts Discussed in Thread: TPS61181, TPS61161, TPS61183

Dear Sir,

I'm looking for White LED Driver to drive the LED backlight which is used in 7" LCD display.

The LED backlight consist of 7 LEDs in series and 3 chains in total (Total 21 LED).

The LED forward Current is 20mA and forward Voltage is 22.4V per chain.

The input voltage is between 3.6V and 6V.

Do you have any recommendation of TI's WLED dirver whch is fulfilled the specification as mentioned above? Thanks.

Regards,

Calvin

  • 0
    TI__Guru**** 176486 points

    What type of dimming, PWM or analog do you prefer?

    If you want precise matching of the LED current per string, then I suggest one of the TPS61181/2 or TPS61183 with 3 of the strings disabled.  Using those parts, you will need to apply a separate 5V to power the IC itself.  If precise matching is not a concern, then I suggest the TPS61161 with ballast resistors (5-10 ohm) in series with each string.