• State TI Thinks Resolved
  • Locked Locked
  • Replies 2 replies
  • Answers 1 answer
  • Subscribers 63 subscribers
  • Views 367 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TPS65150-Q1: LCD bias supply vout rail

William Tu1
Prodigy 210 points
Part Number: TPS65150-Q1

Hi all,

I could find the block diagram on the tps65150-q1 datasheet, could you please answer my question?

1. I could find 5 of vout rail, could you please explain me where the each of rail goes to? I think Vcomp goes for the buffer, Boost converter output goes to the LCD power?

2. Could you please tell me where the Negative, Positive Charge Pump, and Gave-voltage shaping voltage goes to?

3. Could you tell me why the negative voltage(negative charge pump) is needed?

Thank you

  • 0
    TI__Intellectual 1965 points

    Hi William,

    Thanks for your question. The expert for this part is available on weekdays and will look at your question within the next few days.

    Best,

    Grant

  • 0
    TI__Mastermind 18550 points

    Hello Willian,

    Instead of block diagram, typical application schematics in figure 17 of the datasheet would be more helpful for understanding.

    AVDD, VCOM, VGH and VGL rails are all connected to LCD module. Gate voltage shaping input is connected to timing controller which may or may not be on the LCD module.

    To answer your specific questions:

     1. Some LCD displays require common bias voltage for all switches in the matrix and VCOM rail is intended to provide that voltage.

    2. Negative and positive charge pump rails supply voltage for gate on (VGH) and gate off (VGL). These voltages normally power a level shifter that is used to convert logic level signals to high voltage signals needed for the panel's gate control. The gate voltage shaping input should connect to timing controller. Timing controller uses the gate voltage shaping function to reduce cross-talk between LCD pixels by reducing the gate drivers’ input supply voltage between lines.

    3. As I explained in item 2 above, negative voltage charge pump is used for gate off voltage and normally connects to a level shifter on LCD module.

    Kind Regards,

    Liaqat