component alternative to 50 W telecom power modules.
鈥?/div>
The
PA0273
transformer was designed for (but not limited to) the follow-
ing application:
Topology:
Two-switch forward
Frequency:
250 kHz
Pri./Sec. Isolation:
Basic Insulation (1500 Vdc)
Input Voltage:
36-72 v telecom input
Output Voltage(s):
12 v / 4.5 A output (with an auxilary primary side
control winding - 12 v/100 mA)
To determine if the transformer is suitable for your application it is neces-
sary to ensure that the temperature rise of the component (ambient plus
temp. rise) does not exceed its operating temperature. To determine the
temperature rise of the component it is necessary to calculate the total
power losses (core and copper) in the application.
Total Copper Losses (Pcu_total(W))
Pcu_total(W) = sum of the losses in each winding
The losses in each winding can be calculated by:
Pcu(W)= .001* DCR(m鈩? * (Irms
2
)
Core Losses (Pcore(W)) To calculate core loss, use the following formula:
CoreLoss (W) = 2.298 E-12 * (Freq_kHz)
1.6
* (^B/2)
2.5
Where:
^B = (Minimum_Input_Voltage)*(Maximum_DutyCycle)*
10
5
/ (4.96 * Freq_kHz)
Temperature Rise
Temp.Rise (擄C) = 27.27*CoreLoss(W) + 47.4*Pcu_Total
Operating Temperature (擄C) = Max.Ambient (擄C) + Temp.Rise(擄C)
For More Information :
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DISTRIBUTOR
Performance warranty of products offered on this data sheet is limited to the parameters specified. Data is subject to change without notice. Other brand and product
names mentioned herein may be trademarks or registered trademarks of their respective owners.
Printed on recycled paper. 漏2002, Pulse Engineering, Inc.
PRELIMINARY P564.P (8/02)
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