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LM76003-Q1: Data OTA and Oscillator voltage of PWM stage

Stefan Pleier
Prodigy 80 points
Part Number: LM76003-Q1

Hello together,

I have two questions about data, which i cannot find in the data sheet:

1. Can you provide me the transfer-function of the internal OTA used as error amplifier?

2. What is the peak-peak voltage of the oscillator voltage used in the pwm stage?

I need these values to complete my calculations regarding stability.

with kind regards

Stefan

  • 0
    TI__Genius 10655 points

    Hello Stefan,

    This isn't information that we typically disclose. 

    You can use Webench Power Designer to get started with a design and simulate the phase and gain margin for a given set of operating conditions and passive component values. 

    The best way to ensure a stable design will be to test your desired operating conditions on an EVM and run a frequency response measurement using a frequency analyzer. 

    Regards,

    Harrison Overturf 

  • 0 in reply to Harrison Overturf
    Prodigy 80 points

    Ok thank you Harrison Overturf. Do you have any information about how to simulate the gain and phase margin of a converter in a spice simulator? 

    Regards,

    Stefan 

  • +1 in reply to Stefan Pleier
    TI__Genius 10655 points

    Hello Stefan,

    In order to simulate the gain and phase margin of a converter you will need an average model for the device in question. Unfortunately for the LM76003-Q1 does not have an average model available only transient models. Your best option will be to simulate your design using Webench and get gain and phase information from there. 

    Regards,

    Harrison Overturf