DRV2511-Q1: Some questions about DRV2511

Hi Jiawei,

Thank you for your questions. Please give me a day or two to go through your questions and get the best answer for you.

Best,

Christine

Hi Christine,

Could you kindly give feedback by tomorrow? Customer are urgent for this. Thanks!

Jiawei

Hi Jiawei,

From the question in the attached document:

1. As long as you aren't trying to surpass a current of 4.7A, these inductors chosen should be fine. This post might also help with more information on this.

2. If you are setting the PWM signal to 0, the current would be driven to ground. Are you expecting a reverse current here?

3. They should not increase as mentioned so this should not be a problem. The supplies should be stable with the capacitor choices that are shown in the design.

4. The function of the LPF circuit is to transform the PWM signal into a sine wave which the input pin can take. As a reminder, this is an analog input.

Best,

Christine

Hi Christine,

Thanks for your reply. I have another questions:

1. After the power is turned on, the IC itself will generate a 10ms PWM pulse. What is the reason for this?

1. During the power-on process, a pulse will be generated when out+ rises from 0V to 6V. What is the reason for this pulse? How can this pulse be filtered out?

1. for Single end input, datasheet have following describe:

   that means IN- have following three connect options or just have ① and ③ , what is different?
   ① IN-pull up to 3V；
   ② IN-tied to GND;
   ③ IN- 0.1uF to GND

2. The LPF loop needs to be added to the PWM control loop. What is its function? Are the settings on our circuit reasonable?
   In the circuit design of our company, if the capacitor of PWM+ is removed, it is easy to pull down INTZ and cause the drive IC to not operate. Please also help to identify the reason.

BR

Jiawei

Hi Jiawei,

Please give me until the end of the week to respond.

Best,

Christine