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SW FET V
DS(MAX)
= 600V
SW FET R
DS-ON
= 3.5Ω
V
f(D4)
= 0.8V
V
RING
= 50V
P
OUT(MAX)
= 6.5W
V
OUT
= 26.5V
V
OVP
= 47V
V
AUX
= 13V
η = 85%
n = 5
A
L
= 90nH/turns
2
A
e
= 19.49mm
2
V
CC
= 12V
V
Z(D5)
=12V
R11=49.9kΩ
V
GS(Q1)
=0.7V
13.2 Preliminary Calculations
Nominal peak input voltage:
(42)
Maximum peak input voltage:
(43)
Minimum peak input voltage:
(44)
Maximum average input current:
(45)
Duty cycle:
(46)
Maximum peak input current:
(47)
13.3 SW FET
Maximum reflected voltage:
(48)
24
AN-2091 LM3448 - 230VAC, 6W Isolated Flyback LED Driver SNOA555C–April 2011–Revised May 2013
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