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TPS5430 – Internal Compensation Network

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Guru 21045 points
Other Parts Discussed in Thread: TPS5431, TPS5430

The customer is demanding the information on Z1 and Z2 inside a device.

(detasheet P8 FUNCTIONAL BLOCK DIAGRAM)

Although the customer understands that it is [type III compensation network],

(detasheet P19 Internal Compensation Network)

the customer wants to know the parameter of Resistor and Capacitor.

  • 0
    TI__Guru**** 191445 points

    the actual values are not available, but the effective values can be derived from the datasheet information on page 18:

    The design equations given in the example circuit can be used to generate circuits using the TPS5430/TPS5431. These designs are based on certain assumptions and will tend to always select output capacitors within a limited range of ESR values. If a different capacitor type is desired, it may be possible to fit one to the internal compensation of the TPS5430/TPS5431. Equation 23 gives the nominal frequency response of the internal voltage-mode type III compensation network:

    Equation not shown, see datasheet

    Where
    Fp0 = 2165 Hz, Fz1 = 2170 Hz, Fz2 = 2590 Hz Fp1 = 24 kHz, Fp2 = 54 kHz, Fp3 = 440 kHz Fp3 represents the non-ideal parasitics effect.

    Using this information along with the desired output voltage, feed forward gain and output filter characteristics, the closed loop transfer function and effective component values can be derived.

  • 0 in reply to JohnTucker
    Guru 21045 points

    Thank you for answer.

    Ｉ understood. thank you very much.