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TPS61071: Inductance impact in output

Part Number: TPS61071

Hi Team,

My customer now use TPS61071 to boost 4V to 5V.

Now they haven't added load in their circuit. The measurement value of inductor is 3.99uH. However,customer has 3 board, one is 5V normal, the other two are abnormal, 1.7V and 3.5V. When they are abnormal, the SW is no sawtooth waveform。

May I ask whether TPS61071 has great Requirement in inductor?