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Original question:

DLP3030-Q1: PMOS and 15uH inductor parameters

DLP3030-Q1: Inductor of LED drive circuit

Bruce Yang
Prodigy 140 points
Part Number: DLP3030-Q1

Tool/software:

Question 1:According to the reference Design REV A document TIDA080004, the 15uH of the LED driver circuit uses Coilcraft's XAL1010-153MEB, the specifications are: 11.3*10*10mm, DCR=18mΩ, Isat=15.5A, Irms=13.8A; Now we use other brands of inductors, the specifications are: 11*10*3.8mm, DCR=45mΩ, Isat=10A, Irms=6.25A, SRF=9MHz; Can it be used? What are the risks?

Question 2:Must the ground circuit of the LED drive part be isolated? That is, PGND is used and then connected to GND via a magnetic bead.

Question 3:Low Level Flicker Reduction Circuit Does it have to be increased? I saw that this part of the circuit was removed from the reference design provided by PGU manufacturer.

  • 0
    TI__Genius 9095 points

    Hello Bruce,

    Please see the answers below:

    1. I am assuming the new inductor is 15uH? The higher DCR will reduce efficiency. The lower current rating will reduce the current limit for the driver.

    2. The ferrite bead is added to reduce high frequency noise from PGND going to GND. This may not be required for all designs. Layout, PCB stack up, driver currents, etc. are factors that can contribute to a quiet or noisy GND plane.

    3. The flicker reduction circuit is highly recommended to implement because we believe it is critical for robust image performance. 

    Regards,

    Lori