DRV8301: amc1304

Jinyuan,

The buck inside the DRV is actually the TPS54160 die, I will forward your post to the team that best supports that device.

For the SH current measurement, could you please show us a block diagram of the configuration you are mentioning?

Regards,

-Adam

Jianyuan,

"As you know, the mcu_3.3v will use for drv8301’s config pin (such as pwrgd , noctw , nfault , en_gate, and vdd_spi),

And the en_bulk is always pull up by PVDD1.

is it ok ( not self-lock ) ?"

Yes it is okay!

"at the same time, I’ll use the sigma-delta module chip (ti’s amc1304) to sample the mosfet’s current(the net is sh_a).

i connect the amc1304’s ldoin  to the drv8301’s bst_a( gate floating voltage ), is it ok ?"

We do not recommend using the BST output to power external devices.

Regards,

-Adam

Thank you very much for your supports.

The AMC1304 shoud have a floating voltage on the pin LDOIN and AGND.

And how can I do with AMC1304 and DRV8301 ?

Use a Operational amplifier to amplify the current from the BST_A ?

Jianyuan,

Which current are you trying to measure using the AMC1304?

If it is the phase current, then the Sense resistor and the DRV built in CSA will be measuring this.

Regards,

-Adam

we have two planes，

the one is the phase current at low MOS.S port, as you say it’s measured by DRV’s SN1/SP1

and the another one is we should measure the current at high level witch is to/from the MOTOR’s leg

referring to the sch’s R170.

And we must do these case , and get witch one is best for our all kinds of apply.