Application example

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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

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 = Inductance(table) = 194 μH
• DCR = 1 ÷ [Wpri × (1 ÷ DCR(table))] = 1 ÷ [(3 × (1 ÷ 0.030]) = 0.010 Ohms
• VT = VT(table) = 131.9 V-μsec
• Irms = Irms(table) × Wpri = 2.90 × 3 = 8.70 A

• DCR = 1 ÷ [Wsec × (1 ÷ DCR(table))] = 1 ÷ [(3 × (1 ÷ 0.030)] = 0.010 Ohms
• Irms = Irms(table) × Wsec = 2.90 × 3 = 8.70 A