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Channel: TPS5450DDA exhibits poor step load transient response
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RE: TPS5450DDA exhibits poor step load transient response

Transient response voltage deviation is usually determined by the output capacitance and ESR.  It will also vary with slew rate.  Fast slew rates can require quite a bit of low ESR output capacitance....

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RE: TPS5450DDA exhibits poor step load transient response

Hi John: I am new to the forum so hopefully I get this scope photo posted correctly.  The outpot vlatge is shown in purple at 1V/div, the load current in green at 1A/div and the blue is the MOSFET...

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RE: TPS5450DDA exhibits poor step load transient response

That is good for a start.  I would like to see a zoomed in version similar to this:Where the top trace is the output voltage ac coupled and teh bottom trace is the current waveform.  I want to see the...

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RE: TPS5450DDA exhibits poor step load transient response

Hi John:Unfortuantely, I do not have the assembly right now to give you the view you desire.  I will need to get this data later. When you refered to the LC filter double pole you were referring to the...

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RE: TPS5450DDA exhibits poor step load transient response

That is a very fast transient, 100x faster than what I usually test.  You can estimate the the charge that is removed form the output during that time and how much capacitance is required to keep the...

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RE: TPS5450DDA exhibits poor step load transient response

Hi John:I appologize for the long delay but I had to complete some other work.  Back to the issues with my implemenation of the TPS5450.  I was not vey clear in my past posts.  The test fixture I made...

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RE: TPS5450DDA exhibits poor step load transient response

Hi Craig,How much overshoot and undershoot are you hoping for? Will the transient in the real application be from full load to no load?A fast transient response from a full load to no load can present...

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TPS5450DDA exhibits poor step load transient response

I designed a switching regulator circut using the TPS5450 regulator with a 24V nominal input and a 3.3V output.  I needed to support 5A for short term start-up (less tha 500ms) with an average current...

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