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DRV8889-Q1: Consult about Voltage Drop and SC detection

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Part Number: DRV8889-Q1

Hello expert,

   1. voltage drop question: 

   According to datasheet, max Rds(on) is 0.85R, even when output 1A,the voltage drop Voltage drop from VM to A/Bout will be less than 0.85V.

   Below is my test:When VM=9V, the Aout is 8.3V, it seems OK.

    But when VM=19V, Aout is only about 16V. The voltage drop(3v) seems too high? How to improve the voltage drop?

    About the motor, L=12mH max, R=6.9Ohm+-10%

    2. Can the device detect A/Bout short circuit to

    2.1 Vbat,

   2.2 GND

   2.3 each other(such as A1 to B1)


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