Application example for Hexa-Path – Forward

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 = Irms_table

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 130 Watt, 1:1, two switch forward converter transformer

Choose HPH6-2400L
Vin = 36 – 57 Vdc; Vout = 12 V, 10.8 A

Part number	Inductance (µH)	Percent Tolerance	DCR max (Ω)	Volt-time product (V-µs)	Irms (A)
HPH6-2400L_	194	25	0.03	131.9	2.9

Connecting primary windings in parallel:
When primary windings (W_pri) 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 = Inductance_table = 194 μH
DCR = 1 ÷ [W_pri × (1 ÷ DCR_table)] = 1 ÷ [(3 × (1 ÷ 0.030)] = 0.010 Ohms
VT = VT_table = 131.9 V-μsec
Irms = Irms_table × W_pri = 2.90 × 3 = 8.70 A

Connecting secondary windings in parallel:
When secondary windings (W_sec) are connected in parallel, DCR decreases and Irms increases.

Example: For HPH6-2400L, connect three secondary windings in parallel:

DCR = 1 ÷ [W_sec × (1 ÷ DCR_table)] = 1 ÷ [(3 × (1 ÷ 0.030)] = 0.010 Ohms
Irms = Irms_table × W_sec = 2.90 × 3 = 8.70 A

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Application example

Formulas used to calculate electrical characteristics

Create a 130 Watt, 1:1, two switch forward converter transformer

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