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SwitcherPro feature request: load step response

Other Parts Discussed in Thread: TINA-TI

Hello,

It would be nice if SwitcherPro could calculate the output voltage response to a load step under the "What if Analysis" tab. 

For example: some DSP consumes about 1A static current and you would analyse what the voltage drop becomes if the processor suddenly needs 0.5A more current, thus a load step of 0.5A. Several factor play of course a role: output capacitance, output capacitor ESR, resistance from PS to load, loop response of PS, etc. Such feature could ease the calculation of the required bulk capacitance to keep the voltage within the right margins if you know the dynamic behaviour of the load.

Is it possible to add such feature to SwitcherPro?

Kind Regards,

Frans

  • Hi Frans,

    Thanks for your feedback. SwitcherPro today does not have this capability. We are aware of this need. But, you can do load step (transient) simulations in TINA-TI.

    TINA-TI is a free simulator provided by TI. You can download it from http://www.ti.com/tina-ti. Many of the devices available in SwitcherPro have an TINA-TI EVM available for download at http://www.ti.com/spicerack. You can download the EVM schematic, modify it to match the design proposed by SwitchePro, and add a unit step current source in parallel with your load resistor to model the load-step. Please see the attached PDF for more information.

    Thank you for evaluating TI parts in SwitcherPro.

    Regards,
    Michael

    Michael Krasnicki
    Analog eLab
    Texas Instruments

    5657.load_step.pdf