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LM3405A: LED Backlight

Tristan Auguste
Prodigy 30 points
Part Number: LM3405A

Hello everyone,

I am looking to drive a display back light. According to the vendor of the display,it is constant current driven. The voltage is typical 9.9V.  The typical current is 200mA. Input Voltage is 12V. I wanted to know if this IC can be use? 

 

  • 0
    TI__Mastermind 28655 points
    Hello Tristan,

    It is close to the limit due to duty cycle. If the freewheel diode is added in the dutycycle can get above the minimum specification for maximum duty cycle meaning there isn't enough overhead voltage (12V - 9.9V). The tolerance of the 12V, LED voltage and any voltage drops in the traces/circuit can make this worse.

    Best Regards,