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DLPA3000: Can I use PWR6 of DPLA3000 to power focus motor?

Intellectual 360 points

Replies: 12

Views: 664

Part Number: DLPA3000

Hi, Sir

Currently, we have a DLP driver board (DLPA3000+DLPC3438), I want to use PWR6 as the power supply of motor driver chip (A3901). So it's possible or not?

Thanks

Br

Tao

Tao

  • Zhang,

    The PWR6 general purpose buck has a current limit of 2A and a maximum voltage of 5V. If the A3901 can be supported with these specifications, you should be OK.

    What operating conditions are you targetting?

    Best Regards,
    Philippe Dollo
  • Expert 5415 points

    In reply to Philippe Dollo:

    Hi Tao,

    We haven't heard back from you. I'm tentatively closing this thread, please reply below if you need further support on this issue.

    Regards
    Azad
  • In reply to Philippe Dollo:

    Hi, Philippe

    Thanks for your replay, I need to check with supplier for A3901. Btw, 2A current is the peak current or operation limit?

    thanks

    Tao

  • Expert 5415 points

    In reply to Zhang Tao:

    Hi Zhang,

    2A is the recommended operating limit for the general purpose buck converter.

    Please let me know if there is anything related to this that you might need help with.

    Regards
    Azad
  • In reply to Azad:

    thank you very much. another question is about PWR3&PWR4, from TI reference design these two power input use 5V, and from your spec these input supply can use system power, for example, 12V. 

    So what's the purpose of this design? just for efficiency and thermal?

    thanks

    Br

    Zhang Tao 

    Tao

  • Expert 5415 points

    In reply to Zhang Tao:

    Hi Zhang,

    Based on the chipset you mentioned (DLPA3000+DLPC3438), I presume you're referring to the reference design of the DLPDLCR3010EVM-G2 (TIDA-01571). This design has a 19V input to the system, which would be an unnecessarily high input for the two LDO's generating 3.3V and 2.5V, given that the max input supported by these LDO's is 20V.

    Regards
    Azad
  • In reply to Azad:

    So, we can use 12v for these two LDO as the input, right?

    Tao

  • Expert 5415 points

    In reply to Zhang Tao:

    Hi Zhang,

    Yes, that shouldn't be a problem.

    Regards
    Azad
  • In reply to Azad:

    Another question, Can I use PWR4 as the MSP430 3.3V power supply? and risk in here?

    Tao

  • Expert 5415 points

    In reply to Zhang Tao:

    Hi Zhang,

    As long as the load current is less than 200 mA, this shouldn't be a problem (assuming you have taken care of supplying PROJ_ON to the system without the front-end MCU). But this would mean that the MSP430 would be switched on long after the projector is on (PROJ_ON high), so if this approach works for your design then you should be good to go.

    Also note that the MSP430 reference code provided for the EVM designs assumes that the MCU is on before switching on the DLPC, so you will have to modify the reference code to work in your design (if you plan to use the reference code, that is).

    Regards
    Azad

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