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WEBENCH® Tools/TPS63000: When driving TEC, the work is abnormal in BUCK mode

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Replies: 4

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Part Number: TPS63000

Tool/software: WEBENCH® Design Tools

When driving TEC, it was abnormal when working in BUCK mode. The whole circuit input 3.3v voltage and output 1.3v-5.4v voltage range.TEC generates 300-400ma current;At present, when the circuit is in boost mode, it works normally. In BUCK mode, the Vfb voltage is abnormally increased.

For example, set output 1.3v, actual Vout output 2.2v, Vfb= 0.56v;May I ask how he caused it? How can I modify the circuit to solve it? Thank you