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TLE4275-Q1: stability analysis

O'Mellin
Expert 4925 points
Part Number: TLE4275-Q1

Hello team, customer is looking for stability data with following input:

 

Input cap =

1)1*10uF=10uF 25V  1206

 Part no:  GCJ31CR71C106KA15L

2)1*100nF=100nF 50V 

Part no:GCJ21BR71H104KA01L

 

Output Cap=10uF*3=30uF  0805

Part no:C2012X7S1C106KT0Y0E

 

OUTPUT CURRENT CONSUMPTION= 1)EQUAL to 10mA (one Phase margin result)

                                                      2)EQUAL to 50 mA (One phase margin result)

                                                       3)EQUAL TO 100mA (One phase margin result)

  • 0
    TI__Mastermind 29320 points

    Hello O'Mellin,

    We will need to build this onto an EVM and do a transient test.
    The EVM's are scheduled to arrive next week.
    We'll need to order samples of the TLE4275-Q1 to populate on them, which requires 5 days shipping.

    I'll place the order and it may take until the end of the month to conduct the tests.

    Thanks,

    - Stephen

  • 0 in reply to Stephen Ziel
    TI__Mastermind 29320 points

    Hello O'Mellin,

    I wanted to provide an update.
    The hardware and components arrived yesterday afternoon.
    Today I will initiate the process of installed the linear regulator onto the EVM, and if possible capture some test data.
    This may extend into early next week but I will provide you the results as I have them.

    Thanks,

    - Stephen

  • 0 in reply to Stephen Ziel
    TI__Mastermind 29320 points

    Hello O'Mellin,

    We had to order new TE as ours became nonfunctional.  That is the cause for the delay.  The TE arrived yesterday afternoon and I should have a measurement today.

    Thank you for your patience.

    Thanks,

    - Stephen

  • 0 in reply to Stephen Ziel
    TI__Mastermind 29320 points

    Hello O'Mellin,

    The frequency response analysis indicates 8 degrees of phase margin with this loading.
    It is very noisy and almost looks oscillatory. 

    I'll need to try the load transient method tomorrow to confirm.
    I'll provide those results when I have them.

    The datasheet specifies the following for the stability criteria for this device.
    Ceramics can be used but they would need a series resistor to meet the ESR.

    Thanks,

    - Stephen

  • 0 in reply to Stephen Ziel
    TI__Mastermind 29320 points

    Hello O'Mellin,

    I have confirmed that the linear regulator is unstable with this load at all 3 load currents.
    The oscilloscope measurements are provided below showing the AC coupled output and the oscillation seen.

    Thanks,

    - Stephen