Page Comparison

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• V_{in_max} = 55V, V_out = 5V, I_out= 5A, K_ind = ΔI_L/I_out = 0.3 (recommended by datasheet), and f_sw= 400kHz

• Using the equation above, L_min = 7.6uH. Choose the next standard value of 8.2uH. The saturation current of the inductor should be greater than the switch current limit of 7.5A

OLD PART: https://www.digikey.ca/en/products/detail/würth-elektronik/7443330820/2175573

NEW PART: https://www.digikey.ca/en/products/detail/codaca/CSEB0770H-8R2M/16566340

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• V_in = 55V, V_out = 12V, f_sw= 400kHz, I_out = 2A

• K = ΔI_L/I_out, choose k=0.4

• Using the above equation, L = 29.3uH

• Choose closest standard value, 33uH

• Inductor saturation current should be >= I_sc , the high side switch current limit of 3.2A, to avoid component damage due to high current when the inductor saturates

OLD PART: https://www.digikey.ca/en/products/detail/würth-elektronik/744770133/1638634

NEW PART: https://www.digikey.ca/en/products/detail/tdk-corporation/SPM10065VT-330M-D/12175283

Justification: Slightly smaller, cheaper, higher current and saturation current ratings.

Output Capacitor

• Output capacitor allows for the load to be powered during the off state of the transistor and accounts for load transients

• Voltage rating should be 2-3x the output voltage to account for voltage spikes

• The datasheet recommends 22uF for a 12V output

• Use 3x 22uF to account for DC bias at 12V

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