HORIZONTAL P.C. MOUNT SWITCHMODE TRANSFORMERS
SERIES
4-81

Standard EE Style switchmode transformers for customers who need cost effective solutions to switching magnetics requirements. Applications for these transformers are DC-DC and rectified offline switchers using flyback, forward, pushpull, halfbridge, or full bridge topologies.

MAXIMUM OUTPUT POWER @ 100KHZ

Size Code

Flyback, Forward

Pushpull, Bridge

Core Size

L

W

H

A

B

C

# OF PINS

WT. (GRAMS)

4-81-1

5

6

125SMT

.68

.55

.43

.40

.10TYP

.150

12

3.6

4-81-2

5

6

125

.68

.55

.43

.40

.10TYP

.150

12

3.6

4-81-3

10

12

187

.75

.71

.68

.51

.15

.20TYP

8

14.0

4-81-4

24

29

250

1.03

.82

.85

.62

.15

.20TYP

10

20.0

4-81-5

110

132

375

1.47

1.08

1.04

.87

.15

.20TYP

12

55.0

These transformers are designed to meet UL and CSA requirements and are Hipot tested at 1000VRMS standard with higher voltages avaiable. MCI´s 4-81 Series utilizes standard materials for quick turnaround of custom variations. MCI´s "State of the art" manufacturing facilities provide automatic assembly and 100% final testing to guarantee a high quality part. Our design engineers are knowledgeable regarding switchmode magnetics and can provide many solutions for your switching applications.

The above transformers can be used in four topologies, flyback, forward, pushpull, and bridge converters. For supplies in the 5-110 watt range the flyback is recommended. It has the least parts count, only one input switching devices, and no output inductor or freewheeling diode. It also exhibits excellent tracking between multiple outputs.

Information required to order a 4-81 Series Transformer:

  • Input voltage and range
  • Operating frequency
  • Maximum duty cycle
  • Topology Desired
  • Application of transformer
  • Output voltages
  • Operating current and range for each output
  • Switching regulator chip (if known)
  • Safety agency approval transformer needs to meet

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MCI TRANSFORMER CORPORATION
411 Manhattan Avenue, Babylon, NY 11704 • 631. 587. 0510 • FAX: 631. 587. 0624
25 Blodgett Street, Orange, MA 01364 • 978. 544. 8272 • FAX: 978. 544. 8356
150 Sanhedrin, Willits, CA 95490 • 707. 459. 5994 • FAX: 707. 459. 5998
Email us your questions at info@mcitransformer.com