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TIDM-BIDIR-400-12: Questions about two diode from TIDM-BIDIR-400-12

Part Number: TIDM-BIDIR-400-12

Hi Ti experts,

1. In the schematic of TIDM-BIDIR-400-12, two Diodes(D11 and D5) will be on sometimes when in the boost mode.  If I want the full-bridge switches to be used for synchronous rectification in the boost mode,  could the D11 and D5 stay? 

2. What's the function of the circuit?(fig_1) Is it sinking the Lk current spike? And how do calculate the parameters about these caps and resistance (D4, R6, C1, C30, R8, R9)?

If the Ti team had more information, please share it with me. Thanks a lot.

fig_1

Sway