TLD2 Bill of Materials for 335mA output, X60 25:1 trimming U1: Richtek RT8450B [TSSOP16] U2: RT9058-50GV [SOT353] U3: 74AHCT2G125DC [8VSSOP] D1: 2A 40V Shottky diode [DO-214AC, Vishay SSA24 recommended] L1: 22uH [pads for Bourns SRR6028 series] All caps X5R multilayer ceramic C1: 106 35V [1206] C2: 105 10V [0805] C3: 103 10V [0603] C4: 332 10V [0603] C5: 474 6V [0603] C6: 106 35V [1206] R1: 10k [0603] R2: 10k [0603] R3: 0 [0603] R4: 10k [0603] R5: 1k [1206] RA: trim [0603] (usually left open) RB: 390k [0603] RC: 1R3 [1206] RD: 1R0 [1206]