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Original question:

TPS92530-Q1: How to understand the two registers FMFREQ and FMMAG

TPS92520-Q1: Power management forum

jiali.tian
Prodigy 55 points
Part Number: TPS92520-Q1
Other Parts Discussed in Thread: TPS92530-Q1,

Tool/software:

TPS92520-Q1+TPS92530-Q1+TPS92682

Dual-sided metal enclosure

We are conducting EMC testing to meet Class 5 standards. There's an issue where the VCE (Voltage Controlled Oscillator) exceeds the limit by about 4dB in the 76~106MHz range. The test passes when we turn off the BUCK converter. Do you have any solutions for this problem?

  • 0
    TI__Mastermind 23136 points

    Hello Jiali,

    Please provide schematics and layout of the design.  Give test conditions and setup.  That means setpoints for each converter and information about the load.    Please also give me the scan so I can see where you fail and what the limits are.  At 76-106 MHz that is likely a layout issue.