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PTD08A210W: PTD08A210W was protected or broken?Help!

Part Number: PTD08A210W
Other Parts Discussed in Thread: UCD9248,

Dear all:

              I  met  a problem:1 used UCD9248+PTD08A210W to generator the power I need,but when I power up,the current is very large,cut down at once,I measure the output impedance of PTD08A210W after cuting down the load,the result  is only 4Ω ,PTD08A210W  was protected or  broken?what should I do?