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SM72445: questions about some functions of sm72445 chip

Jeong Eon Park
Prodigy 20 points
Part Number: SM72445


While reading the datasheet to test the applicability of the sm72445 chip, the following questions arise and asks.
please answer about my question.
Thank you.

1. Does the sm72445's PM operation operate in a normal conditions (operating at rated power except startup or transient state) rather than a startup operation?

2. If pm operation works even under normal conditions, how do you follow Vmpp value change according to solar radiation and temperature change?

3. In order to operate pm in normal conditions, must two additional PM mosfets be inserted?

4. If pm operates in normal conditions, does it work only when the input voltage and the output voltage are completely the same? Or will it work if the difference falls within a certain value(mV or uV)?

5. Are there any TI chip products that operate PM in normal conditions without two additional FETs?

thank you :)

  • 0
    TI__Guru 61255 points

    Hello Jeong,

    I think most of your questions are answered if you read through the text in the Overview section on page 7 of the datasheet and review the text in Figure 8.

  • 0 in reply to Brigitte
    Prodigy 20 points
    I have already read the datasheet.
    However, I couldn't make a clear conclusion about the above questions, so I asked them here.

    I would be really grateful if someone who knows about the chip will respond.
  • 0 in reply to Jeong Eon Park
    TI__Guru 61255 points

    Hello Jeong,

    1, 3 and 5. Yes. The SM72445 does not require a dedicated switch to implement Panel Mode. The four buck-boost switches can be controlled to implement PM. A dedicated switch may be used for higher efficiency.

    2. Every 60 seconds after going into Panel Mode, MPPT mode will be entered for a maximum of 4 seconds time to check whether or not the converter is operating at maximum power point
    OR
    There is an x% change in power from the power when panel mode was engaged. This percentage can be set on ADC Ch 2

    4. Integrated into the chip is an 8-channel, 10 bit A/D converter used to sense input and output voltages and currents, as well as IC configuration. Externally programmable values include maximum output voltage and current as well as different settings for slew rate, soft-start and Panel Mode.