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Original question:

LMG2100EVM-078: I got a dfferent Versions

LMG2100EVM-078: LMG2100EVM-078

Fajar Budiman
Prodigy 60 points
Part Number: LMG2100EVM-078
Other Parts Discussed in Thread: LMG5200EVM-02, , LMG2100R044

Tool/software:

Dear TI,

LMG5200EVM-02 has no heatsink, but the LMG2100EVM-078 has a heatsink, Can I remove the heatsink as I use for 24V supply and current 5-10A and max peak 20A?, is there any constrains regarding this heatsink for the device?

I want to use for bidirectional DC/DC converter for charge/discharge supercapacitor from DC Bus (that can be negative or positive current/power flow), Is there any reference design this?

Best,

Fajar

  • 0
    TI__Intellectual 1170 points

    Hi Fajar,

    The heatsink is to keep the device under 125C during load conditions.
    Yes, you can remove the heatsink. Please monitor the device temperature while testing and make sure it is under 125C.

    We don't have a bidirectional reference design using this device. Are you looking for bidirectional buck-boost kind of topology?

    Best Regards,
    Madhur

  • 0 in reply to Madhur Wagle
    Prodigy 60 points

    Hi Madhur,

    Thanks for the quick reply. as I will use for harvesting one robot actuator driven by BLDC, I will not use heatsink since it will be more weight and uncompact. 

    Yes, we are looking for bidirectional buck-boost, in the datasheet is and example for buck in which I think it also can used as bidirectional converter with half-bridge that may be extended for 4switches(cascade) one. I would like to use it with supercapacitor to charge while the motor is braking and discharge while it is need for the DC bus.

    One more thing regarding supply before I test my evaluation board, in the evaluation board user guide, it is stated to give 6V input. "Onboard LDO for generating 5-V VCC supply from an unregulated supply between 5.5 V and 10 V."
    In the datasheet it can be powered by 5 V. Can I use 5 V instead of 6 volt since it is common power supply for my system?

    Best regards,

    Fajar

  • 0 in reply to Fajar Budiman
    TI__Intellectual 1170 points

    Hi Fajar,

    Understood. It is possible to have a buck boost design using LMG2100R044.
    Give me some time to illustrate this to you.

    For the 5V supply - force 5V-GND on TP6-TP4 instead of supplying it through J3. This is to bypass the LDO and the extra dropout.

    Best Regards,
    Madhur