EVSPIN32G06, the BJT in BEMF cirucuit, 6 step sensorless mode

[VictorChiou]

[PN]:  EVSPIN32G06Q2S1
[VERSION]: MCSDK 6.4.1
[TOOL]: MC WB
[DETAILS]:

6step and sensorless

about the BEMF circuit, BJT(Q2/Q5/Q8)

 

the MCWB give me a tip

 

should I keep the BJT and short B-E?

wha’s the purpose of these BJT(Q2/Q5/Q8)?

[Fabrice LOUBEYRE]

The BEMF topology defined in EVSPIN32G06Q2S1 includes, in addition to the BEMF divider, a transistor stage configured as a transistor emitter follower circuit, also called a common-collector amplifier. The emitter follower circuit reproduces the input voltage at the output. It acts as an impedance adapter. The load seen at the input equals the output load multiplied by the transistor gain.

The warning provided by the MCSDK Workbench refers to the available configuration path for BEMF or Hall, as shown in the figure below.

 

 Best regards.

Fabrice

[VictorChiou]

>>The load seen at the input equals the output load multiplied by the transistor gain.

Do you mean it also occurred when I shorted B-E?

That doesn't make sense.