INA185-Q1: INA185-Q1 used in BLDC’s phase current sensing's reference deign.

Leo Ma

Expert 4136 points

Part Number: INA185-Q1
Other Parts Discussed in Thread: INA240, INA185, INA180

Tool/software:

Hi Expert,

Have a nice day!

Customer wants to use INA185-Q1 (INA185A1QDCKRQ1) to sense BLDC’s phase current.

Application scenario:

FPWM:20kHz,

IOUT: 20~30A

Support need:

Customer wants to know does TI have some reference design or success stories about INA185-Q1 using in BLDC current test.

Thanks!

Best Regards,

Leo Ma

6 months ago

0 Mallika Senthil 6 months ago

TI__Expert 8560 points

Hi Leo,

We unfortunately don't have any reference designs to share, but we do have a few app notes that maybe useful.
https://www.ti.com/lit/ab/sboa171d/sboa171d.pdf

The app note focuses on the INA240:
https://www.ti.com/lit/an/sboa172/sboa172.pdf

Best,
Mallika Senthil

0 Leo Ma 6 months ago in reply to Mallika Senthil

TI__Expert 4136 points

Hi Malika,

Thanks for help.

Could you help to review if their design is fit for the application scenario (FPWM:20kHz, IOUT: 20~30A)?

Schematic:

Thanks!

Best Regards,

Leo Ma

+1 Mallika Senthil 6 months ago in reply to Leo Ma

TI__Expert 8560 points

Hi Leo,

The following are my comments:

1. The capacitors to GND on the input sense lines are not required.

2. The decap from Vs to GND is generally recommended to be 0.1uF, but this can vary depending on the system requirements. Please evaluate if 10nF is needed here.

The following can be used as a reference diagram, the INA180 can be replaced by the INA185.

https://www.ti.com/lit/ug/tidueq9a/tidueq9a.pdf

Best,
Mallika Senthil

0 Leo Ma 6 months ago in reply to Mallika Senthil

TI__Expert 4136 points

Thanks！

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INA185-Q1: INA185-Q1 used in BLDC’s phase current sensing's reference deign.