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ADP1621 Synchronization Input doesnt work?


I want to use two ADP1621 for a +/-13V power supply

One in Sepic Mode (+13V), the other in Cuk Mode (-13V)

As, in the datasheet described, i fed in the external clock (500kHz, 0 to 5V=Vin, 50%DutyCyle)

by Pin: SDSN. But in LTSpice Simulator the Controller doesnt't work. Always off....

When i pull up the SDSN Pin (without clock) everything is fine.

 -) Is there anywhere an example or application note about synchronisation

-) Is perhaps the LTSpice Model corrupted

here is my Spice circuit

Thanx for your help

best regards,


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