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TPS65218: TPS65218 DCDC1-3 unstale switching frequency

Part Number: TPS65218

Hello all,

I measured switching frequency on DCDC1-3 by using TI TPS65218EVM. The frequency is MIN 1.89Mhz TYP 1.96MHz MAX 2.18MHz.

It look like spread spectrum or jitter. But switching frequency on DCDC4 is satble. Both are Forced PWM mode.

  I attachied both wave forms. Please tell me the reason.

Best Regards.,

M.Iwasaki