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SLVSGG1 – FEBRUARY 2022
5 V + 0.5 V
DMIN
=
= 0.22
2 × 36 V × 0.4 × 0.85
(34)
NPS × V
× DMIN
IN_MAX
LP =
fsw × IMAG
(35)
(36)
2.5 × 36 V × 0.22
LP =
= 33 μH
500 kHz × 0.06 × 20 A
Though the calculated value of LP is 33 μH, it may often be challenging to find the exact primary inductance
value needed for the transformer design. As such, an inductance of 40 μH was used in the actual design.
The following equations detail the how to calculate transformer primary and secondary currents that are critical
for proper design of the transformer. These equations are useful for defining the physical structure of the
transformer. Note that these are ideal equations, and the final design should be optimized depending on the
application.
IL
ISEC _MAX = IOUT
+
2
(37)
(38)
8.51 A
2
ISEC _MAX = 20 +
= 24.25 A
(39)
(40)
(41)
(42)
(43)
(44)
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