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LM56: Asking for LM56 design review

SHH
Mastermind 32186 points
Part Number: LM56

Hi Team,

Would you please review LM56 schematic?

customer would like to set 5˚C to turn on thermal heater and 35˚C to turn on the FAN.

BR,

SHH

  • 0
    TI__Mastermind 28075 points

    Hi SHH,

    I believe they need to swap their 5C/30C and 5C/35C resistor columns.

    Also, they should keep in mind the 5C hysteresis for the OUT1 Pin that they are using for heater control. If their circuit moves from room temperature to cold then they actually wont see the pin go high until (Vt1- 5C) or 0C. The OUT1 pin would go low again once the temperature was above 5C (see the functional description diagram on page 7 of the datasheet for confirmation). 

    If they want the OUT1 pin to go high at 5C and low again once the temperature has reached 10C they should set their lower threshold at 10C. 

    Best Regards,
    Brandon Fisher