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LM5176-Q1: Two parallel configuration

Jeffrey Chung1
Expert 2460 points
Part Number: LM5176-Q1
Other Parts Discussed in Thread: LM7321, LM5176

Hi,

I'd like to ask you some questions about two parallel configuration of LM5176-Q1, The related old thread and reviewed schematic are as follows. 

TI DR_0724_Reviewed.pdf

Could you explain my customer's questions below in more detail?

1. CC_LIMIT is used only on master of LM5176-Q1 through guide of reviewed schematic. It says that "Use the CC_LIMIT to control the master, and The slave will follow by the sharing circuit". I want to know how to control the current sharing circuit by CC_LIMIT only of master.

2. When CC_LIMIT of master is off, output voltage is being moved between 0V and 3V in CCM. I want to know the reason why, and whether it is controlled by the current sharing circuit of LM7321.

Regards,

  • 0
    TI__Guru 68495 points

    Hi Jeffrey,

    1. Because the current sharing circuit will force the two phases to have the same current, setting the CC limit for the master will have the same effects on the slave. 

    2. The current sharing circuit should still function.  If you have 3.3V or lower, you may need to bias the sharing control op-amp with VCC of the LM5176, because the op-amp requires proper bias supply.   But at 0V or very close to 0V on the output rail, you may lose the sharing because the sharing circuit op-amps's input offset may prevent the circuit from working properly. 

    Hope this clarifies.

    Thanks,

    Youhao Xi, Applications Engineering

  • 0 in reply to Youhao Xi
    Expert 2460 points

    Hi Youhao,

    Thanks for your response. It will be help my customer understand the current sharing operation for two phases configuration. Let me ask you something if my customer has the additional questions.

    Regards,

  • 0 in reply to Jeffrey Chung1
    TI__Guru 58215 points

    Hello Jeffrey,

    If there are more questions from the customer, please post them below or create a new thread is this one is locked already.