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© Coilcraft, Inc. 2009
Hexa-Path Magnetics
Document 613-10
Revised 01/23/09
Document 613-10
Connecting primary windings in series
When primary windings (Wpri) are connected in series, inductance and
volt-time product increase, energy storage and
Irms remain the same,
but DCR increases.
Example: For HPH1-1400L, connect three primary windings in series:
Inductance = Inductancetable × Wpri2
= 89.6 × 32 = 806.4 µH
DCR = DCRtable × Wpri
= 0.130 × 3 = 0.39 Ohms
VT
= VTtable × Wpri
= 70.2 V-µsec
Irms = Irmstable
= 0.74
Connecting secondary windings in series
When secondary windings (Wsec) are connected in series, Irms
remains the same, but DCR increases.
Example: For HP1-1400L, connect three secondary windings in
series:
DCR = DCRtable × Wsec
= 0.130 × 3 = 0.39 Ohms
Irms = Irmstable
= 0.74
Create a 1 : 1 gate drive transformer
Choose HP1-1400L
Primary:
L = 806.4 µH
DCR = 0.39
Irms = 0.74 A
VT = 70.2 V-µsec
DCR
Volt-time
Peak energy
Part
Inductance
max
product
storage
Isat
Irms
number
(µH)
(Ohms)
(V-µsec)
(µJ)
(A)
(A)
HP1-1400L
89.6 ±25%
0.130
23.4
N/A
N/A
0.74
Secondary:
DCR = 0.39
Irms = 0.74 A
1
4
Pri
Sec
5
6
3
2
11
10
12
9
8
7
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