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BUF16821-Q1: COM1/2 & OUT1-16 Current Definition

Part Number: BUF16821-Q1
Other Parts Discussed in Thread: BUF16821

Dear, Sir.

My customer is considering to apply BUF16821-Q1 for their system.

I would like to confirm following.

1. I supposing VCOM1/2 will be for COMMON voltage. And OUT1-16 will

   be for pixel driver. I wonder my understanding is correct?

2. According the datasheet, VCOM1/2 current is defined on 100mA

   source/sink. Does it mean the maximum current for those 2ch considering the

   junction temperature under OUT1-16 all on?

3. OUT1-16 current is defined on 10mA source/sink. Does it mean the maximum

   current for all 16ch considering the junction temperature under VCOM1/2 all on?

4. The datasheet is defined "Continuous output current" as 30mA.

   What is the meaning of this definition(30mA)?

Please give your advice.

Best Regards,

H. Sakai

  • Hi,

    I have notified our expert regarding this topic. Please expect a response by 9/19/19.

    Thanks,

    Aaron

  • Dear, Sir.

    I am still waitng for your answers against my previous questions.

    I am hoping to get your advice.

    Best Regards,

    H. Sakai

  • Hi Sakai san,

    1. Correct

    2. Vcom current can exceed 100mA with less accuracy - fig 2, 100mA is a typical value. Thermal limitation is a function of total power dissipation and ambient temperature.

       The power dissipation is function of Vs, Vout , Iout and number of channels used. For example for Tamb=85C, the max allowed power is 1W( (125C-85C)/40C/W))

    3. Same answer as 2, what matter is the total power dissipation

    4. That's the worst condition, buf16821 output current can go up to 30mA. If just one channel needs 30mA that's not an issue, a lot of high current outputs may case thermal issues. Assuming a Vs-Vout=10V, 3 outputs set to 30mA is the limit for Tamb=95C.

    Regards,

    Costin