Power integrations InnoSwitch3 Application Note page 10

Application Note
Step 4 – Transformer Construction Parameters
Enter: CORE, AE, LE, AL, VE, BOBBIN, AW, BW, MARGIN
Choose Core and Bobbin based on maximum output power.
TRANSFORMER CONSTRUCTION
61 PARAMETERS
62 CORE SELECTION
63 CORE
64 CORE CODE
65 AE
66 LE
67 AL
68 VE
69 BOBBIN
70 AW
71 BW
72 MARGIN
73
74 PRIMARY WINDING
75 NPRIMARY
76 BPEAK
77 BMAX
78 BAC
79 ALG
80 LG
81 LAYERS_PRIMARY
82 AWG_PRIMARY
83 OD_PRIMARY_INSULATED
84 OD_PRIMARY_BARE
85 CMA_PRIMARY
86
87 SECONDARY WINDING
88 NSECONDARY
89 AWG_SECONDARY
90 OD_SECONDARY_INSULATED
91 OD_SECONDARY_BARE
92 CMA_SECONDARY
93
94 BIAS WINDING
95 NBIAS
Figure 7. Transformer Core and Construction Variables Section of InnoSwitch3 PIXLs Spreadsheet.
Core Type, CORE
By default, if the core type cell is left empty, the spreadsheet will
select the smallest commonly available core suitable for the
continuous (average) output power specified. Different core types
10
Rev. A 10/18
RM6 Info
4
6
The transformer windings may not fit: pick a
bigger core or bobbin and refer to the Transformer
RM6 Parameters tab for fit calculations
PC95RM06Z Core code
37.00 mm^2 Core cross sectional area
29.20 mm Core magnetic path length
2150 nH/turns^2 Ungapped core effective inductance
1090.0 mm^3 Core volume
B-RM06-V Bobbin
15.52 mm^2 Window area of the bobbin
6.20 mm Bobbin width
Safety margin width (Half the primary to
0.0 mm secondary creepage distance)
77 Primary turns
3125 Gauss Peak flux density
2844 Gauss Maximum flux density
933 Gauss AC flux density
140 nH/turns^2 Typical gapped core effective inductance
0.310 mm Core gap length
4 Number of primary layers
30 AWG Primary winding wire AWG
Primary winding wire outer diameter with
0.303 mm insulation
Primary winding wire outer diameter without
0.255 mm insulation
248 Cmil/A Primary winding wire CMA
6 Secondary turns
19 AWG Secondary winding wire AWG
Secondary winding wire outer diameter with
1.217 mm insulation
Secondary winding wire outer diameter without
0.912 mm insulation
216 Cmil/A Secondary winding wire CMA
15 Bias turns
and sizes from the drop-down list are available to choose from if a
user-preferred core is not available, the grey override cells (AE, LE,
AL, VE, AW & BW) can be used to enter the core and bobbin
parameters directly from the manufacturer's data sheet.
AN-72
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