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Configuring TPS40090 for two phase operation

Other Parts Discussed in Thread: TPS40090, TINA-TI

I am using the TPS40090 (Multi-phase Controller) in two phase configuration. I have de-activated the even phases by connecting them to the output of the internal 5-V LDO (BP5 pin). Current sensing pins CS2 and CS4 are connected to CSCN pin. When i simulate the circuit in TINA-TI, i did not get any output. However when i connect the BP5 pin to 5-V i get my desired output. Do we need to connect the BP5 pin to 5-V  for two phase configuration.

Converter Parameter are as follow


Vin=12V.
VOUT=1.5V
Load Current=30A
Switching Frequency=500KHz
No of Phases=2

Any help in this regard will be highly appreciated.

Thanks in Advance