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Thread: Littlebee 20A PRO Esc's Now Available!

  1. #1

    Littlebee 20A PRO Esc's Now Available!

    The next generation of Littlebee 20A Esc's have arrived!

    With this ESC's new Silabs F396 MCU processor, it is able to handle the higher RPM motors with ease. At 48Mhz the processor on this ESC runs nearly twice as fast as the previous version. It has also been equipped with more flash memory and RAM. Designed to be compact and lightweight, this may be the perfect choice for many of the FPV Racers and Acro flyers! The FVT Littlebee 20A Pro ESC supports 2-4S lipos, are n-fet mosfet driven and with fast, dedicated driver chips on a high quality PCB, while remaining one of the smallest ESCs on the market.

    Comes with Blheli firmware installed.

    Now in stock at ProgressiveRC!

  2. #2
    Join Date
    Jun 2012
    New Zealand
    What are the benefits of the greater RAM and Flash memory? What advantage does the "pro" have over the standard Little Bee?

  3. #3
    The greater ram and flash memory will allow for future software upgrades that could potentially use more memory, so some future-proofing there. In addition to the added memory compared to the original Littlebee, the Littlebee Pro has the silabs F396 chip which runs at 48Mhz, as opposed to the F330 chip on the previous ESC which runs at 24Mhz. This allows for a faster ESC looptime as well as compatibility with much higher eRPM, which is very useful for high Kv motors, common with multirotors.

  4. #4
    What do you class as a 'high rpm' ESC?

  5. #5
    To quote Oscar Liang:

    The F396 runs at 50MHz while the older generation LittleBee F330 runs at 25MHz. One limitation of the F330 MCU is, when your motor is spinning pass certain speed, it will start to struggle to keep up and desync. To be a bit more specific, the F330ís eRPM limit is at around 200K, while the F39X is 360K (eRPM is the product of input voltage, magnetic phases (poles/2), motor KV and efficiency, source). For a 2000KV motor on 6S for example, the motor eRPM can go up to 240K where you might see motor/ESC de-sync.

    Since the F396 is twice as fast as the F330, it also has the ability to process the flight controller commands twice as fast as the F330 which ultimately leads to better and more stable control.

    When talking to Justin Nishida, he added:

    When using Raceflight and Multishot with the (F396) and say even a naze32 (rev5) you can run 4k/4k (looptime / ESC refresh rate) without having any desync issues. The f330 canít properly handle refresh rates above 2.6k so you are limited to 4k/2.6k at best and even then you are pushing the ESC to its limit, so most just run 4k/2k to stay on the safe side.

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