Application example for Hexa-Path – Flyback

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 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	Inductance (µH)	Percent Tolerance	DCR max (Ω)	Volt-time product (V-µs)	Peak energy storage (µJ)	Isat (A)	Irms (A)
HPH3-0138L	23.6	20	0.125	43.9	1.457	0.42	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 = Inductance(table) × Wpri² = 23.6 × 2² = 94.4 μH
DCR = DCR(table) × Wpri = 0.125 × 2 = 0.25 Ohms
Isat = (Isat(table) × 6) ÷ Wpri = (0.42 × 6) ÷ 2 = 1.26 A
Irms = Irms(table) = 1.13

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

Example: For HPH3-0083L, connect two secondary windings in parallel:

DCR = 1 ÷ [Wsec × (1 ÷ DCR(table))] = 1 ÷ [(2 × (1 ÷ 0.125)] = 0.0625 Ohms
Irms = Irms(table) × Wsec = 1.13 × 2 = 2.26 A

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Application example

Formulas used to calculate electrical characteristics

Create a 13 Watt 2:1:1 flyback transformer with a bias winding

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