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TPS62175: Fail to output 5V

Other Parts Discussed in Thread: TPS62175


I use TPS62175DQCR converting 24V DC to 5V DC to power the RS-485 signal chain block with reference to TIDM-1005 REV E1. It doesn't work. I measured voltages at different pins. The voltages at pins of VIN and EN are 24.35V. The voltages at pins of VOS and SLEEP are 0.08V. I can not find the reason. Please help me to find out something wrong or missing in my design.

My schematic chart and pcb layout are shown as below.

best regards