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LMQ66430-Q1: LMQ66430-Q1 Bode Plot Question

Sundy Zhou
Prodigy 50 points
Part Number: LMQ66430-Q1
Other Parts Discussed in Thread: LMQ66430,

Tool/software:

Hi, TI expert,

I am testing the LMQ66430-Q1 circuit and encountered some issues when testing the Bode plot. The LMQ66430 is configured in FPWM mode. I would like to know whether it is possible to test its Bode plot under light load or no-load conditions. And I have some doubts: Is the CCM mode of the converter linear under light load or no-load conditions?

Additionally, for the transient response test, what is the appropriate current slew rate to set, and are there any relevant documentation? I know that if the slew rate is set too slow, the test results cannot reflect the real system characteristics, but I am confused about what slew rate should be set to meet the requirements.

  • 0
    TI__Mastermind 22300 points

    Hello,

    For this device, the bode plot must be tested using adjustable output configuration. 

    You should be able to test the bode plot in FPWM at light load.

    Typical load transients slew rates tested for this device are 1A/us. 

     In light load, the converter will operate in DCM. To operate in CCM, the load current must be greater than half of the inductor current ripple.

    Best regards,

    Ridge