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TPS61170 SIMULATION

Nigel Kidd59623
Prodigy 10 points
Other Parts Discussed in Thread: TPS61170

Hi,

     I would be very grateful if you could help regarding a SwitcherPro question.

Switcher Pro is set to simulate a TPS61170 with the following settings:

Voltage input minimum 15 volts

Voltage input maximum 15 volts

Output voltage 38 volts

Output current 0.25 amps

The simulator shows an output capacitor C4 of 4.7 uF. An output current of 0.25 amps gives a load resistance

of 152 ohms.

The loop response indicates a dominant power stage pole at 222 Hz. However if I use the formula from

page 16 of the TPS61170 datasheet for a current controlled boost converter I get 445 Hz which is twice the value.

 

Many thanks for your help.

                                             Nigel

  • 0
    TI__Guru**** 166076 points

    The datasheet shows a simplified boost converter loop model based on Ray Ridley's work.  SwitcherPro uses a slightly different model.  The factor of 2 difference in frequency is actually not that significant when ploted on a semilog-x scale.  Regardless of which model is used to design the compensation, we recommend that you test the loop response on a working board, either with a loop measurement device (e.g. Venable) or a simple load transient. 

  • 0 in reply to Jeff F
    Prodigy 20 points

    Hi Jeff,

                 Very many thanks for your technical help. This clears

    up the differences.

    Best regards,

                         Nigel