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© Coilcraft, Inc. 2009
Hexa-Path Magnetics
Document 613-8
Revised 01/23/09
Document 613-8
Connecting primary windings in parallel
When primary windings (Wpri) are connected in parallel, DCR decreases,
Irms increases, and inductance and volt-time product remain the same.
Example: For HPH6-2400L, connect three primary windings in parallel:
Inductance = Inductancetable
= 194 µH
DCR = 1
÷ [Wpri × (1 ÷ DCRtable)]
= 1
÷ [(3 × (1 ÷ 0.030]) = 0.010 Ohms
VT
= VTtable
= 131.9 V-µsec
Irms = Irmstable × Wpri
= 2.90 × 3 = 8.70 A
Connecting secondary windings in parallel
When secondary windings (Wsec) are connected in parallel, DCR
decreases and
Irms increases.
Example: For HPH6-2400L, connect three secondary windings in
parallel:
DCR = 1
÷ [Wsec × (1 ÷ DCRtable)]
= 1
÷ [(3 × (1 ÷ 0.030)] = 0.010 Ohms
Irms = Irmstable × Wsec
= 2.90 × 3 = 8.70 A
Create a 130 Watt, 1 : 1, two switch forward converter transformer
Choose HPH6-2400L
Vin = 36 – 57 Vdc; Vout = 12 V, 10.8 A
Primary:
L = 194 µH
DCR = 0.01
Irms = 8.7 A
VT = 131.9 V-µsec
DCR
Volt-time
Peak energy
Part
Inductance
max
product
storage
Isat
Irms
number
(µH)
(Ohms)
(V-µsec)
(µJ)
(A)
(A)
HPH6-2400L
194 ±25%
0.030
131.9
N/A
N/A
2.90
Secondary:
DCR = 0.01
Irms = 8.7 A
14
25
36
12
9
11
8
10
7
Pri
Sec
Formulas used to calculate electrical characteristics
Connecting windings in series
Inductance = Inductancetable × (number of windings)2
DCR = DCRtable × number of windings
Isat = (Isattable × 6)
÷ number of windings connected in series
Irms = Irmstable
Connecting windings in parallel
Inductance = Inductancetable
DCR = 1
÷ [number of windings × (1 ÷ DCRtable)]
Isat = (Isattable × 6)
÷ number of windings connected in series
Irms = Irmstable × number of windings