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TPS61178: Question Asking

Part Number: TPS61178

Hi team,

My customer have some question on TPS61178.

CH1 Vin; CH2 Vout; CH3 SW ;CH4 EN

Below is the test specification:

Vin: 4V


Iout: 2.5A

Frequency:1MEG HZ (steady state)

When the system start up,  customer see the SW waveform is discontinued (red circle), is this normal? what's the root cause to make this phenomena.