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TPS40090: Understanding the current sensing method

Ammar Afi
Prodigy 110 points
Part Number: TPS40090

Hello,

I would like to ask about peak current mode control of TPS40090. Current sensing pin 1 until 4 is compared to the control current (Idroop) provided by the voltage loop regulator. I don't really understand this, how do Idroop changes according to Iout? Iout need to be divided to number of phase to know the exact Iphase. Iphase is the reference current that will be compared to current sensing current. This will ensure the current balancing across each phases. Correct me if i'm wrong.

Thanks

  • 0
    TI__Mastermind 24075 points

    Hi Ammar, 

    In peak current mode controller, the phase current sense signal is compared with COMP voltage. The COMP voltage is the error amplifier output. 

    When phase current sense signal rises up and reaches COMP voltage, the pulse is terminated. 

    Because all phases share the same COMP signal, current balance is achieved naturally. 

    Thanks

    Qian