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DRV8305-Q1: Current sense amp Electrical Characteristics

cafain
Mastermind 6755 points
Part Number: DRV8305-Q1

Hi,

1.

Although min and max values are listed in the data sheet,
Request data in graph form showing temperature change (temperature drift) of
"Current sense amplifier gain error", "DC input offset" and "Reference buffer error".

2.

About Current sense AMP
At present, Current sense AMP can not follow when
differential input voltage: 4mV,
cycle: 30μs,
duty: about 50% input,
event not occurring in output is occurring.
What kind of reasons can be considered?

best regards

  • 0
    TI__Guru** 114905 points
    Hi Cafain,

    Can you clarify "event not occurring in output is occurring." What does this mean?

    Can you provide a schematic of the output of current sense amplifier and any filtering, plus scope captures showing the input and output voltages of the current sense amplifiers?
  • 0 in reply to Rick Duncan
    Mastermind 6755 points

    Hi, rick-san

    I appreciate your support

    We obtained user's circuit diagram and waveform data.
    We would like you to see the data, but because it becomes confidential matter can not be posted on e2e.

    I hope you send the data to your personal mail.
    Will it be a problem?

    I would like to consider, thank you.

    best regards

  • 0 in reply to cafain
    TI__Guru** 114905 points
    Hi Cafain,

    You can send the schematic via private message. Place the cursor over my name in the e2e forum. A menu will appear to allow you to send a private message.
  • 0 in reply to Rick Duncan
    Mastermind 6755 points

    Hi, Rick-san

    I appreciate your support.
    I immediately sent the circuit diagram and waveform data to the private mail.
    If you see it and have any questions, please reply to me.

    The content you asked is、
    Current sense connect a 2mΩ shunt resistor between the input terminals (SP1-SN1) of the amplifier.
    A current of 2A flows in the shunt resistor at a period of 30μs.

    During the above operation, the current sense AMP output(SO1) continues to output "no Pulse".
    Please let me know what caused the problem.

    Best regards