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TL594: Common mode input voltage, error amplifier

Part Number: TL594
Other Parts Discussed in Thread: TL494,


Hi support team,

Is the MIN value of "Common mode input voltage, error amplifier" 0.3V?


"-0.3V" is written in some places.

Regards,
Dice-K

  • Dice-K,

    I interpret this as 0.3V being the minimum common mode input voltage. When you see the negative, "-", this is likely referring to 0.3V applied to the inverting input terminal to give -0.3V.

    Regards,

    Steve

  • Hi Steven,
    Thank you for your reply.

    TL494 says "-0.3 to VCC-2", but are there any differences in the specification?


    Is the difference only in the way it is written?

    Best regards,
    Dice-K

  • Dice-K

    The common mode input voltage range parameter you are highlighting specifies that the minimum common mode voltage is bound between -0.3V<VCM<VCC-2V. The voltage that is common to both inputs of the op amp can be anything within this range. Most opamps are limited to within a diode drop of the supply rail limits. The TL594 is biased between VCC and GND which set the limits of -0.3V (diode drop below GND) and VCC-2V (approximate diode drop below VCC). 

    Steve