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  • LM3509: One 6x LED string vs. 2 3x LED strings

    Part Number: LM3509 Hello all, My customer is looking to illuminate 6x LEDs using <50mA of ILED. I saw in another thread that it was recommended to split into two unison rails between MAIN and SUB/FB with 3x LEDs on each rail rather than put 6x LEDs…

  • LM3509: String length?

    TI Thinks Resolved
    Part Number: LM3509 I'm looking at using the SPMWHT541ML5XA (attached) with the LM3509SD. I want to run strings of 6 LEDs; we want a specific light dispersion. Vf (max) is 2.9V. Current draw is expected to be 30mA per string, although it looks like…
    • Answered

  • LM3509: Parallel LED connection in MAIN pin

    Resolved
    Part Number: LM3509 hi, I'm designing a board with LM3509 and would like to connect 2x2 led in main pin to drive with 40mA current output. Can you please let me know, whether this configuration is supported by the chip. Attached image for your refere…
    • Resolved
    • Answered

  • LM3509: SCH review

    Resolved
    Part Number: LM3509 Hi Team, My customer now use LM3509 to drive three LED in their project. May I ask whether the SCH is ok? LED IF= 30mA, in this application, they limit the current to 20mA by RESET.
    • Resolved

  • LM3509: no output on the OVP and SW pins

    TI Thinks Resolved
    Part Number: LM3509 Hello, a few days ago I've received my new PCB with LM3509 on it which supposed to drive 6 white LEDs (3 x 2). After assembly and tests all component on the PCB work apart from the aforementioned LM3509. I've been trying to debug…

  • LM3509: Maximum LED current

    TI Thinks Resolved
    Part Number: LM3509 Other Parts Discussed in Thread: TPS61169 , TPS61165 Hi, I have planned to use LM3509 LED driver. I would like to connect 4 LEDs in series and get 40mA constant output current. Can you confirm if this is possible and what is the maximum…
    • Answered

  • LM3509: LM3509 Parallel Connection of Current Sinks MAIN and SUB/FB

    Resolved
    Part Number: LM3509 Hi, I am working on a design that uses the LM3509. An LCD that we are integrating has four anode connections and one cathode connection. In order to realize a higher current capability, can the MAIN and SUB/FB pins both be connected…
    • Resolved

  • LM3509: Thermal and power dissipation information

    TI Thinks Resolved
    Part Number: LM3509 Hi, Customer is requesting the θJC, ψJT and the power dissipation information for the LM3509. Please help. Best regards, Randy Chen

  • lm3509: Proper use for LM 3509?

    TI Thinks Resolved
    Part Number: LM3509 I'm looking for a way to control the brightness of LEDs of various colors. (PWM is not an option due to possible sensor sensitivity to strobing). I'd like to use the LM3509 as a current source to the anodes of a number of different…

  • LM3508: LM3508 vs LM3509 question about calculation formula

    Part Number: LM3508 Other Parts Discussed in Thread: LM3509 Dear support member, My customer used LM3508. I have question about calculation formula. LM3508 datasheet 14 page formula 9 include Inductor. LM3508 same series LM3509 datasheet 22 page formula…

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