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Selection of the TX cascade driver

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  • Marchel
    replied
    Why complicate it, the XP Deus FMF coil has an H-Bridge connected via 10R resistors directly to the GPIO on the processor and the detector works great.

    Leave a comment:


  • JoyJo
    replied
    What's strange? The hip2103 driver is just installed in Equinox and it controls the assembly of ao4882 mosfets. And everything works fine. One output of the TX coil is connected to the midpoint of the MOSFets, the second output of the TX coil is connected to the ground.

    Leave a comment:


  • Detectorist#1
    replied
    Hi JoyJo,
    The MOSFETs haves Gates, Sources and Drains. Which is the "shutter" end, maybe the Gate? With these type of drivers is not possible to connect second end of the TX coil to GND. Lower MOSFET, when is open, will shunt the TX coil.

    Leave a comment:


  • JoyJo
    started a topic Selection of the TX cascade driver

    Selection of the TX cascade driver

    I would like to know the opinion of the forum members regarding the TX cascade driver.
    1. The TX cascade is supposed to be with a non-resonant TX coil.
    2. The coil will be controlled by a half-bridge 2N-channel mosfet relative to the minus power supply (ground).
    3. The power supply of the driver chip itself must be 5V.
    4. An adjustable voltage of 20 to 40 (50) V will be applied to the half-bridge
    I selected the half-briss driver chip based on the availability of the chip and its soic-8 body.
    As a result, I chose driver UCC27201.
    I know there is also a good HIP2103 driver, but you can't buy it freely.
    Click image for larger version

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    Now the moments in which I doubt:
    1. The only thing that confuses me is that according to the scheme from the datasheet, this driver controls the midpoint of which, in fact, is connected to the positive power supply. In my case, the midpoint of the MOSFets will be connected to the coil TX, the second end of the coil TX will be connected to the ground.
    In addition, the shutters of the MOSFets will be connected to the driver through resistors shunted by Schottky diodes.

    2. Jitter (signal phase shaking). Won't this driver contribute jitter to the formation of the transmission signal?

    I would like to know your opinion.
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