DRV8886AT: DRV8886AT

user6483709

Part Number: DRV8886AT
Other Parts Discussed in Thread: DRV8825, DRV8886,

1.V RREF test condition is RREF=18-20K；In fact, the circuit is connected to 15K。in this case，what is the VRREF?Is there a corresponding curve for RREF and VRREF？

2.In the image above，drv8825 internal current control PWM frequency is 30kHz。what about DRV8886？there is not stated in the data sheet。calculation of power consumption needs to know this parameter。

over 4 years ago

0 Ryan Kehr over 4 years ago

TI__Guru 55605 points

Please repost with images using the "paperclip" icon above. I am not able to see the images you are referring to.

Thank you!

0 user6483709 over 4 years ago in reply to Ryan Kehr

Prodigy 60 points

8886

PARAMETER	TEST CONDITIONS	MIN	TYP	MAX	UNIT
V RREF RREF voltage	RREF = 18 to 132 kΩ	1.18	1.232	1.28	V

8825

PARAMETER	TEST CONDITIONS	MIN	TYP	MAX	UNIT
ƒ PWM Internal current control PWM			30		kHz

0 user6483709 over 4 years ago in reply to user6483709

Prodigy 60 points

I look forward to replying

0 Wang5577 over 4 years ago in reply to user6483709

TI__Guru 56650 points

Hello,

1. The DRV8886AT device is capable of providing an output current up to 3-A peak, 2-A full-scale, or 1.4-A root mean square (rms).

I would think if the RREF is 15kohm, the VRREF may still be around 1.232V. But, we cannot guarantee because the RREF is out of spec.

2. PWM toff time is 20us, the minimum tblank is 1us. So, the maximum frequency is about 1s/(21us)= 47.6kHz

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DRV8886AT: DRV8886AT