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TPS54295 - the transition point from ECO mode to PWM mode

Hirotaka Matsumoto
Guru 27525 points
Other Parts Discussed in Thread: TPS54295

Hi all

Would you mind if we ask TPS54295?
The datasheet shows that the transition point(from PWM mode to ECO mode) to the light load operation I Ox(LL) current can be estimated with Equation 1 with 700-kHz used as fSW.

So, will the transition point from ECO mode to PWM mode be the same as Equation 1?
Or, does this point have some hysteresis?
Could you let us know it?

Kind regards,

Hirotaka Matsumoto

  • 0
    TI__Guru**** 191445 points

    TPS54295 uses zero cross detection of the switch current.  So the TPS54295 enters eco-mode when the switch current ( = Inductor current) reaches 0 A.  The datasheet eq. 1 just shows that the load current is equal to 1/2 the p-p inductor current.  There is no intentional hyteresis, but there is probably not perfect accuracy in the detection and probably some slight internal delay as well.  The 700 kHz is "nominal" operating frequency.  Since there is no internal oscilator, the actual frequency may vary quite a bit as well, see figure 16 and 17.

  • 0 in reply to JohnTucker
    Guru 27525 points

    John san

    Thank you for your prompt reply!
    We got it.

    Kind regards,

    Hirotaka Matsumoto