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TPS61169: SW output keeps high voltage at 5V when PWM dimming control is 20kHZ,50% duty cycle

Part Number: TPS61169

Hi team, when using TPS61169 , my customer has some problem when debugging at above working conditions. The CTRL=200kHz, duty cycle=50%. VBAT=5V, but the SW output is always 5V high level. FB pin was measured as 4.3V.The external circuit is shown below. And first waveform is SW. Second is CTRL. Can you please help find what is wrong with current configuration? Thanks!