DRV8307 PWM DUTY

Hi Mason,

Mason Noh said:

1. PWM duty cycle range (datasheet: 0~100%)

    what is minimum duty for stop? and maximum duty(recommended condition)?

Can you clarify this? Are you asking what is the minimum and maximum duty cycle that the motor can be stopped?

This normally depends on the motor and system design.

Mason Noh said:

2. datasheet:

If it is changed while spinning, use gradual steps (for example, 1% increments), because a large
change in the commanded duty cycle can cause a large step in commutation, which can lock up the motor. This
behavior is typical with other industry devices.

  : 2~5% is not available??

1% is a recommendation. This is also motor dependent.

Hi Rick,

Thank you for your reply.

Actually, the problem is drv8307 is burnt when driving motor.

Is it possible to separate High side FET drain from VM of DRV8307 like a attached file?

because motor spec is 54V. (VM is 32Vmax)

MT_DRIVE_DRV8307_SIMP.pdf

Hi Mason,

It is not possible to connect the high side FET as shown. The high side FETs need approximately 10V above the 52V to fully turn on.

If you need 52V, the DRV8301/2/3 with and external mcu are possible options.