RDK-131 Freewheeling Diode Selection

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I've noticed that, in several documents relating to the LinkSwitch-TN family, it specifies that for continuous conduction mode the freewheeling diode should have a maximum recovery time of 35ns, but the diode used in the RDK-131 design is a MURS160T3 diode that is listed as having a reverse recovery time of 50ns. Even the RDR-131 document lists the desired diode Trr as 35ns.


Is there a reason for this component choice. Is it just to save cost (I assume the slower diode is cheaper)?

WHILE DESIGNING, COST MUST NOT BE A VERY GOOD CONCERN OF POWER INT TEAM. U MUST FOCUS ON RELIABILITY ND BEST SOLUTION. LATER IN COLUMN , OPTIONS COULD BE GIVEN FOR DIODES COST WISE,IF REQUIRED. WHAT IF I USE BAV21? WILL THE CIRCUIT NOT WORK? ITS STILL CHEAPEST!!!!!!!!!