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In UCC3626 Schematic ?

Other Parts Discussed in Thread: UCC3626

In Figure 17 (page 18 ) UCC3626 datasheet , i have some questions ?

At pin 20 (QUAD) of U1 , why does Vref connect to GND ???

At pin 1   (GND  ) of U1 , why does GND not connect  ???

At Hall sensor, Why we need a RC network ???

Is value of Vref  5V    ???

Thanks for your help.

  • Anybody can help me...

    I need a schematic for my work. Please.

  • There is an error in the block schematic of Figure 17. Vref should not be connected to ground but the ground pin 1 should be connected to ground. I can only guess that a translation error occured in the document and the ground symbol got shifted from pin 1 to pin 20.

    The Hall sensors have a small RC filter on them that filters out any inductive switching noise in the motor sensors.This is fairly normal for BLDC controllers. The layout and component values depend on the application.