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TPS40200 Startup Problem - Stuck in Overcurrent Mode

Other Parts Discussed in Thread: TPS40200

Hello,

We are using the TPS40200 w/ 15-40V Input, 5V/100mA output.  We are having startup problems w/  24V input.  When the input is ramped "slowly" over ~10mS, the supply starts properly.  However when the input is ramped "quickly" over ~20uS, the TPS40200 enters overcurrent mode, as confirmed by monitoring pin 2.  

We were able to reduce the sensitivity some by adding a resistor in series with the gate drive (10-50ohm).  However 1 of 3 units modified still had this problem, so something else is needed.  

We have used the TPS40200 successfully in other applications so we are familiar with the recommended PCB layout.  

Our schematic is attached.  

TPS40200app.pdf