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TPS62130: The SW terminal abnormal output of TPS62130

Part Number: TPS62130

Hi

My customer uses TPS62130.
But the SW terminal doesn't operate normal under conditions.
Could you tell me this reason?
■Spec
 Vin:5V
 Vout:1.2V
 Iout:200mA
 Fsw:2.5MHz
 EN:3.3V
 SS/TR:0.01uF
 L:3.3uH
■situation
-Vin=5.15V, EN is assert
 ⇒OK
-Vin=4.85V, EN is assert.
 ⇒OK
-Vin=5V, EN is assert
 ⇒The SW terminal outputs 1 pulse, after that it isn't oscillation as 0V.
  But this device operates normal by doing under some one.
  ・It is heated.
  ・The Vin waves ±150mV.
  ・The swittching 
Best regards,
Yokota