DRV8702-Q1: How to configure spread spectrum function

Molly Wang

Part Number: DRV8702-Q1

My customer found the description about spread spectrum function in DRV8702-Q1 datasheet. But there is no instruction about how to configure this function. Could you help explain and instruct customer how to configure?

over 2 years ago

0 David Medis over 2 years ago

TI__Mastermind 20260 points

Hi Molly,

The spread spectrum clocking feature is already enabled by default. The device will not need to be configured to implement this feature.

Best,

David

0 Molly Wang over 2 years ago in reply to David Medis

TI__Prodigy 110 points

Thanks David. One more question, Could you help confirm that the fixed spread spectrum range if the output frequency is 10kHz?

In other words, when the driver output 10kHz, how much is the tolerance for each cycle(100us)?

0 David Medis over 2 years ago in reply to Molly Wang

TI__Mastermind 20260 points

Hi Molly,

I will look into it and get back to you on Monday.

Best,

David

0 David Medis over 2 years ago

TI__Mastermind 20260 points

Hi Molly,

The exact specification for the 8702 is not specified, however the typical tolerance range per cycle is in the ns range for similar devices.

Best,

David

0 Brian Xu over 2 years ago

Prodigy 10 points

Hi David

Could I understand it that tolerance is less than 10ns per cycle?

0 David Medis over 2 years ago in reply to Brian Xu

TI__Mastermind 20260 points

Hi Brian,

The output delay tolerance is dependent on multiple parameters. The spread spectrum range is quite small in comparison to other parameters such as propagation delay, and gate drive slew time. The propagation delay is composed of an input deglitcher and output slewing delay and is provided in other gate drivers like the DRV8706 and is in the hundreds of ns range. Unfortunately, this data is not provided for the DRV8702 but is safe to assume it is larger than 10 ns.

A description of the propagation delay can be found in the datasheet and is provided below:

Best,

David

Motor drivers

Motor drivers forum

DRV8702-Q1: How to configure spread spectrum function