HP1-1400L Datasheet, PDF (7/10 Pages) Coilcraft lnc. – Hexa-Path Magnetics

Document 613-7
Hexa-Path Magnetics
Formulas used to calculate electrical characteristics
Connecting windings in series
Inductance = Inductance_table × (number of windings)²
DCR = DCR_table × number of windings
Isat = (Isat_table × 6) ÷ number of windings connected in series
Irms = Irmstable
Connecting windings in parallel
Inductance = Inductance_table
DCR = 1 ÷ [number of windings × (1 ÷ DCR_table)]
Isat = (Isat_table × 6) ÷ number of windings connected in series
Irms = Irms_table × number of windings
Create a 13 Watt 2 : 1 : 1 flyback transformer with a bias winding
Choose HPH3-0138L
Vin = 36 – 57 Vdc; Vout = 12 V, 1.1 A
Part
number
HPH3-0138L
Inductance
(µH)
23.6 ±20%
DCR
max
(Ohms)
0.125
Volt-time
product
(V-µsec)
43.9
Peak energy
storage
(µJ)
1.457
Isat
(A)
0.420
Irms
(A)
1.13
Connecting primary windings in series
When primary windings (Wpri) are connected in series, inductance
increases, energy storage and Irms remain the same, but DCR increases
and Isat decreases.
Example: For HPH3-0138L, connect two primary windings in series:
Inductance = Inductancetable × Wpri2
= 23.6 × 2² = 94.4 µH
DCR = DCRtable × Wpri
= 0.125 × 2 = 0.25 Ohms
Isat = (Isattable × 6) ÷ Wpri
= (0.42 × 6) ÷ 2 = 1.26 A
Irms = Irmstable = 1.13 A
Connecting secondary windings in parallel
When secondary windings (Wsec) are connected in parallel, DCR de-
creases and Irms increases.
Example: For HPH3-0083L, connect two secondary windings in
parallel:
DCR = 1 ÷ [Wsec × (1 ÷ DCRtable)]
= 1 ÷ [(2 × (1 ÷ 0.125)] = 0.0625 Ohms
Irms = Irmstable × Wsec = 1.13 × 2 = 2.26 A
1
12
Pri
2
11
3
Bias
10
Primary:
L = 94.4 µH
DCR = 0.25⏲
Isat = 1.26 A
Irms = 1.13 A
4
9
5
6
Sec
7
8
Secondary:
DCR = 0.0625⏲
Irms = 2.26 A
Specifications subject to change without notice.
Please check our website for latest information.
Document 613-7 Revised 01/23/09
© Coilcraft, Inc. 2009