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ACDC_LinkSwitch-II_0706
12; Rev.1.14; Copyright
Power Integrations 2011
INPU
T
INF
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OUTP
UT UNIT
ACDC_LinkSwitch-II_070612_Rev1-14;
LinkSwitch-II Discontinuous Flyback
Transformer Design Spreadsheet
50
M 0.00 mm
Safety Margin Width (Half the Primary to Secondary
Creepage Distance)
51
L 3.00 Number of Primary Layers
52
NS 16.00
Number of Secondary Turns. To adjust Secondary
number of turns change DCON
53
54
DC INPUT VOLTAGE PARAMETERS
55
VMIN 10.70 10.70 V Minimum DC bus voltage
56
VMAX 374.77 V Maximum DC bus voltage
57
58
CURRENT WAVEFORM SHAPE PARAMETERS
59
DMAX 0.37 Maximum duty cycle measured at VMIN
60
IAVG 0.73 A Input Average current
61
IP 0.19 A Peak primary current
62
IR 0.19 A Primary ripple current
63
IRMS 0.08 A Primary RMS current
64
65
TRANSFORMER PRIMARY DESIGN PARAMETERS
66
LPMIN Warni 314.61 uH
!!! Warning. Minimum Primary inductance is too low and
may result in SOA limits being exceeded. Increase
minimum inductance by designing to higher power.
67
LPTYP 331.17 uH Typical Primary inductance
68
LP_TOLERANCE 5.00 5.00 % Tolerance in primary inductance
69
NP 22.00
Primary number of turns. To adjust Primary number of
turns change BM_TARGET
70
ALG 684.23 nH/tur Gapped Core Effective Inductance
71
BM_TARGET 2500.00 Gaus Target Flux Density
72
BM 2488.12 Gaus
Maximum Operating Flux Density (calculated at nominal
inductance), BM < 2500 is recommended
73
BP 2873.78 Gaus
Peak Operating Flux Density (calculated at maximum
inducatnce and max current limit), BP < 3000 is
recommended
74
BAC 1244.06 Gaus
AC Flux Density for Core Loss Curves (0.5 X Peak to
Peak)
75
ur 145.90 Relative Permeability of Ungapped Core
76
LG Warni 0.01 mm
!!! Warning. Gap lengths less than 0.1 mm not
recommended
77
BWE 19.80 mm Effective Bobbin Width
78
OD 0.90 mm Maximum Primary Wire Diameter including insulation
79
INS 0.08
Estimated Total Insulation Thickness (= 2 * film
thickness)
80
DIA 0.82 mm Bare conductor diameter
81
AWG 20.00
Primary Wire Gauge (Rounded to next smaller standard
AWG value)
82
CM 1024.00 Cmils Bare conductor effective area in circular mils
83
CMA Info
13276.8
3
Cmils/
!!! Info. CMA is on the higher side of recommenation but
design will work. Consider reducing primary layers if
possible
84
85
TRANSFORMER SECONDARY DESIGN PARAMETERS
86
Lumped parameters
87
ISP 0.26 A Peak Secondary Current
88
ISRMS 0.10 A Secondary RMS Current
89
IRIPPLE 0.09 A Output Capacitor RMS Ripple Current
90
CMS 19.20 Cmils Secondary Bare Conductor minimum circular mils
91
AWGS 37.00
Secondary Wire Gauge (Rounded up to next larger
standard AWG value)
92
93
VOLTAGE STRESS PARAMETERS