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TPS7H4001-SP: TPS7H4001-SP Parallel Mode

Part Number: TPS7H4001-SP

Hello,

I'm using the part in internal oscillator mode and trying to use 3 in parallel.  Total load is 34A, 0.8V.  Using the PSPICE transient model, I can't get the output to get to 0.8V using the equations in the datasheet +  the provided calculator.  It works fine with 4 in parallel.

Questions:

1.  Do you have a calculator to help with calculations for components in parallel mode like you do for single device mode?

2.  Is this the correct configuration of the RT and SYNC pins for the 3 devices?  

a) Device 1 RT is lett floating.  SYNC1 connected to device 3 and SYNC 2 connected to device 2.

b) Device 2 RT is tied to 174k (for 500kHz).  Device 2 SYNC1 is connected to Device 1 SYNC2.  SYNC2 is connected to VIN.

c) Device 3 RT is tied to 174k (for 500kHz).  Device 3 SYNC 1 is connected to Device 1 SYNC1.  SYNC 2 is grounded.

Much appreciate any input you might have on this.