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Hexa-Path Magnetics

Document 613-9

Document 613-9 Revised 08/20/15

Connecting primary windings in parallel

current ratings increase, and inductance and volt-time product remain the

same.

Example: For HPH-2400L, connect two primary windings in parallel:

= 194 µH

DCR = 1

= 1

÷ [(2 × (1 ÷ 0.030)] = 0.015 Ohms

VT

= 131.9 V-µsec

= 2.90 × 2 = 5.8 A

Connecting secondary windings in series

Irms remains

the same, but DCR increases.

Example: For HP6-2400L, connect four secondary windings in series,

creating a center tap at pins 9 and 5. For each half of the secondary:

= 0.030 × 2 = 0.060 Ohms

= 2.9 A

Create a 100 Watt, 1 : 2, half bridge forward converter transformer with center tapped secondary

Choose HP6-2400L

Vin = 36 – 57 Vdc; Vout = 24 V, 4.2 A

DCR

Volt-time Peak energy

Part

Inductance

max

product

storage

Isat

Irms

number

(µH)

(Ohms)

(V-µsec)

(µJ)

(A)

(A)

HPH6-2400L

194 ±25%

0.030

131.9

N/A

N/A

2.90

Formulas used to calculate electrical characteristics

Connecting windings in series

Connecting windings in parallel

DCR = 1

1

Pri

2

3

12

11

Sec B

5

4

6

7

8

9

Primary:

L= 194 µH

DCR =0.015

rms=5.8 A

VT = 131.9V-µsec

I

Each half secondary;

SecA(3-9), SecB(5-7):

DCR =0.06

rms=2.9 A

I