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UCD3138HSFBEVM-029: Full-bridge transformer maximum flux density calculation

Part Number: UCD3138HSFBEVM-029
Other Parts Discussed in Thread: UCD3138


Recently I designed a new power supply based on your UCD3138 full-bridge hard-switched dcdc development board.
 I need to calculate the maximum flux density of a full-bridge transformer. I found a formula on the data as follows:
Delta B=(Vin*d*Ts)/(Np*Ae), as shown in the figure below, Vin is the input voltage value, d*Ts is the turn-on time of a MOS transistor, Np is the number of transformer primary windings, and Ae is the core The cross-sectional area.


I am very puzzled about what the value of delta B is. As shown below, is delta B 2*Bm, or Bm, or Br+Bm?


I feel like it should be Bm+Br, but I checked some information, saying that it is 2*Bm, and some say Bm. How much is delta B in the end?