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LM211: Dual power supply

Colin Chen
Intellectual 825 points
Part Number: LM211

Tool/software:

Dear Experts,

We are evaluating LM211 and currently have a question. Our dual power supply is+19V and -10V, and the maximum value indicated in the specification sheet is ± 18V. I noticed that this voltage value is based on the midpoint value of VCC+and VCC -, so I would like to ask if our+19V and -10V dual power supply can also work normally?Thank you~

  • 0
    Guru 317000 points

    These specifications are somewhat misleading. You have a total supply voltage of 29 V, so the midpoint would be +4.5 V relative to your circuit's ground.

    You have not specified what collector and emitter voltages you are using, but your voltages are inside the datasheet's limits.

  • 0
    TI__Guru 60526 points

    Hello Colin,

    +19 and -10 is okay. Beware that your input voltage range would be -8.5V to +17V.

    Just beware that there are limitations on how far the Collector and Emitter pins can be away from V-

    The limit is 30V between the emitter pin and V-.

    As Clemens asked, What are you planning to do with the emitter and collector pins? They set the limits.

    If you ground the emitter pin, then you should be okay as you are only 10V away. The collector could be pulled-up to +40V.

    Also, we have a more modern device that has a R-R input and push-pull output with separate supplies (no latch or trimming). See the TLV1871 - it would be perfectly happy in that configuration.