TRINAMIC Support Knowledge Base

by **steven** » 01 May 2012, 05:39

Hi,

In SPI mode, the INA and INB short, while providing a voltage of 2V together, the B-phase output is 1A(100% output), but the A-phase output is only 25mA.
Is the chip bad, or the chip is not used in correct way.

by **TRINAMIC_BD** » 01 May 2012, 18:11

This sounds, like you have a problem with the sense resistor - it could have a too high value or is completely open.

by **steven** » 02 May 2012, 05:43

hi,

the sense resistor of A-phase is same with the sense resistor of B-phase,so the current of A-phase is same with the current of B-phase.

but the fact is not so!

The attachment is a schematic.

by **TRINAMIC_BD** » 02 May 2012, 09:59

Probably some part is damaged or not well soldered.

by **steven** » 02 May 2012, 11:16

In this case, can I conclude that the chip is not well ?

by **TRINAMIC_BD** » 02 May 2012, 13:37

I don't know - it will not be damaged without reason - normally a bad solder joint or a wrong part is the reason causing malfunction and / or subsequent damage.

TRINAMIC Support Knowledge Base

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