• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Subscribers 30 subscribers
  • Views 794 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.

Hi, I have a question about Class D amp TINA simulation modeling.

Yunsik Chung
Intellectual 1150 points
Other Parts Discussed in Thread: TLV3201, TLV7031

Hi, I am trying to simulate class D amp with TINA.

I designed circuit like above.

However, I got the graph below.

I think that the comparator can not follow the frequency and push-pull mosfet cannot amplify the voltage properly.

my setting is:

Vsaw = 4V amplitude, 3kHz

Vsignal = 3V amplitude, 500Hz,

PMOSFET :

 

NMOSFET :

 

I think it is very basic problem, but it is pretty hard for me to find out what's the problem.

Could you let me know what parameter I should modify?

Thanks,

Yun

  • 0
    TI__Expert 5480 points

    Hello Yun, 

    TLV3201 can't handle the fast switching of the inputs, so I recommend you try TLV7031. This part responds quicker to the inputs, but there is a slight delay in output. Please simulate to see the behavior. Also, be mindful of your input voltage exceeding your supply rails. TLV7031 has a supply voltage range of 1.6 - 6.5V and an input voltage range from Vee- .1 and Vcc + .1 
    The comparator will swing from ~Vee to ~Vcc. So knowing that, you need to check the Vth of the MOSFET, which is quite high at ~3.3V. You may consider changing the MOSFET for one with a lower Vth so you can reduce your source votlage at the PMOS and drain voltage at the NMOS. 

    http://www.ti.com/lit/ds/symlink/tlv7031.pdf

  • 0 in reply to Sally Cheung95
    TI__Intellectual 1150 points

    Hi Sally,

    Thank you for reply.

    I understood what i missed.

    Thank you very much.

    Best regards,

    Yun