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LM3410 DIM input

Greg Bargerstock1
Prodigy 180 points

 

The Dim input control voltages at Vin at 5V are listed as:

         Shutdown Threshold Voltage -- 0.4V

         Enable Threshold Voltage -- 1.8V

If Vin is not at 5V, do these values change?

Also, what is the function of the 100k resistor attached to the DIM pin.

The datasheet list IDIM as 100 nA typ, Is this based on using the 100k resistor and does it change with Vin?

 

  • 0
    Expert 2585 points

    The main purpose of the 100k resistor, which is placed from DIM pin to the Vin, is to pull up the DIM input. It is not recommended to leave DIM input float.

  • 0 in reply to Oleksiy Pazyuk
    Prodigy 180 points

    Ok I get that, but I still need this questions answered.

    The Dim input control voltages at Vin at 5V are listed as:

             Shutdown Threshold Voltage -- 0.4V

             Enable Threshold Voltage -- 1.8V

    If Vin is not at 5V, do these values change?

    The datasheet list IDIM as 100 nA typ, Is this based on using the 100k resistor and does it change with Vin?