• State Resolved
  • Locked Locked
  • Replies 5 replies
  • Subscribers 30 subscribers
  • Views 426 views
  • Users 0 members are here
Support feedback
Options
Options
Related

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.

MCT8316Z-Q1: PWM and FGOUT spec.

Zeming Kong
Expert 3515 points
Part Number: MCT8316Z-Q1

Hi team,

Could you help answer below questions?

1. What is the recommended frequency range for PWM input?

2. Voltage and current abs. range for FGOUT pin? And the delay time between HPx/HPn input and FGOUT output? Is the delay the same for rising edge and falling edge?

Best,
Zeming

  • 0
    TI__Mastermind 26046 points

    Hi Zeming,

    1) PWM frequency is operational up to 200kHz. 

    The minimum duty cycle PWM resolution should be around 0.1% for 20kHz PWM frequency (50 ns). I measured this on the EVM and confirmed that 0.1% change in PWM duty cycle caused noticeable change in OUTx waveforms.

    2) FGOUT is an open-drain output, so the open drain specs should suffice:

    3) The FGOUT is an XOR of the Hall inputs, so the delay would be latency of that design component. I need to check with design if there is any known latency or if this negligible. I will check on EVM today.

    What is the application, and how fast of a PWM frequency does the application require?

    Thanks,
    Aaron

  • +1 in reply to Aaron Barrera
    TI__Mastermind 26046 points

    Hi Zeming,

    I got feedback finally from design, they state that there is a 1us Hall deglitch at the Hall inputs. For FGOUT_SEL = 00b, 01b, or 10b, there are no delays or latency in digital design. For FGOUT_SEL = 11b, there is a small delay from a counter, but we are unsure of how long this delay is. 

    Thanks,
    Aaron

  • 0 in reply to Aaron Barrera
    TI__Expert 3515 points

    Aaron,

    Thank you very much!

    I will share with the customer. BTW I am confirming why and how this device is used, I will let you know if I get any feedback.

    Best,
    Zeming

  • 0 in reply to Zeming Kong
    TI__Expert 3515 points

    Hi Aaron,

    This application is fan motor with high accuracy and high output power required. 

    Also, EVM is out of stock, when will it be available?

    Best,
    Zeming

  • +1 in reply to Zeming Kong
    TI__Mastermind 26046 points

    Hi Zeming,

    MCT8316ZT-Q1EVM has a slight delay, more will be restocked in next 1-2 weeks. 

    Thanks,
    Aaron