UCC28180
SLUSBQ5A –NOVEMBER 2013–REVISED NOVEMBER 2013
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Current Calculations
The input fuse, bridge rectifier, and input capacitor are selected based upon the input current calculations. First,
determine the maximum average output current, IOUT(max)
POUT(max)
IOUT(max) =
:
VOUT
(4)
(5)
360W
390 V
IOUT(max)
=
@ 0.923 A
The maximum input RMS line current, IIN_RMS(max), is calculated using the parameters from Table 1 and the
efficiency and power factor initial assumptions:
POUT(max)
I IN_ RMS(max)
=
hVIN(min)PF
(6)
(7)
360W
I IN_ RMS(max)
=
= 4.551A
0.94 ´85 V ´0.99
Based upon the calculated RMS value, the maximum input current, IIN (max), and the maximum average input
current, IIN_AVG(max), assuming the waveform is sinusoidal, can be determined.
I
=
2I
IN_ RMS(max)
IN(max)
(8)
(9)
I
=
2 ´ 4.551A = 6.436 A
IN(max)
2I
IN(max)
I
=
IN_ AVG(max)
p
(10)
(11)
2´ 6.436 A
I
=
= 4.097 A
IN_ AVG(max)
p
24
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