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  • LP8556: Sink Current for each Channel (LP8556TM-LEDLOAD)

    Resolved
    Part Number: LP8556 Other Parts Discussed in Thread: LP8555 Hi, We are using the LP8556EVM to drive LED strings on LP8556TM-LEDLOAD board. Connector J10 is used to connect LED EVB and LP8555 EVB, where there is a 10 ohm resistor between the LED…
    • Resolved

  • LP8556: LP8556_WQFN I2C control issue?

    TI Thinks Resolved
    Part Number: LP8556 Hello, Regarding the LP8556 I2C control according to the datasheet "5 Device Options", Is LP8556_WQFN pkg not I2C controlled? When I tested it, I confirmed that the Max Current value setting changes to the program setting,…
    • Answered

  • LP8556: Overvoltage protection

    Resolved
    Part Number: LP8556 Hi Team, I would like to ask the following questions about LP8556. 1) The datasheet shows VOVP is " VBOOST + 1.6V" (typ). I believe this " VBOOST " indicates typical value of VBOOST_MAX. Is my understanding correct? 2) Is there typical…
    • Resolved

  • LP8556: VLDO capacitor

    TI Thinks Resolved
    Part Number: LP8556 Hi Team, It is required 10uF capacitor at VLDO as the following. Could you tell me what is occured if my customer uses 4.7uF? He set 1250kHz for fsw in this case. Best Regards, Yaita / Japan disty
    • Answered

  • LP8556: LED Open / Short detect

    Resolved
    Part Number: LP8556 Hello, It is a question about comparator of open short detection of LP8556. LP8556's Logic use three comparators (HIGH, MID and LOW) . What is the threshold of each? Regards, Taichi Nakamura
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    • Answered

  • RE: LP8556: seeking Design evaluation and need to confirm that it will be befitting design in order to get desired requirement and functionalities.

    Resolved
    Hi Ameenu, 1.LP8556 cannot control each channel individually. 2.For adaptive control, the min. boost output is also 7V. BR, Robin
    • Answered

  • LP8556: DRIVER_HEADROOM and LED_COMP_HYST

    Resolved
    Part Number: LP8556 Hi Team, I understood DRIVER_HEADROOM and LED_COMP_HYST is used to decide VBOOST voltage in adaptive control. What situation should we change these register value from default value? I would like to know the criteria to change these…
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    • Answered

  • LP8556: Overvoltage protection -2

    Resolved
    Part Number: LP8556 Hi Team, My customer is evaluating LP8556 and found OVP flag always shows "1" after power-on. He evaluated many boards and saw the same result. It was basically cleared after read the status register once. I believe it is possible…
    • Resolved

  • LP8556: Issues with all six channels enabled, but only use three?

    TI Thinks Resolved
    Part Number: LP8556 Hi guys, My customer has the following question: I have a question about open channels on the LP8556 backlight driver. We are currently using the –E11 version (see page 3) which enables 3 channels but has a max boost output…
    • Answered

  • RE: LP8556: I2C communication is ok ,but the registers value didn't changed

    Resolved
    Hi Fandy, Yes, LP8556 is adaptove boost control, normally we need enable the "ADAPTIVE" bit( reg AA bit 3). For your phenomenon, you have observed 34V ? What your regs seeting with regs A9H? it seems you have set with VBOOST_MAX to 101? In this situation…

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