PRELIMINARY
USA 858 674 8100 • Germany 49 7032 7806 0 • Singapore 65 6287 8998 • Shanghai 86 21 32181071 • China 86 755 33966678 • Taiwan 886 3 4643715
www.pulseeng.com 1 PRELIMINARY P674.B (11/08)
HIGH FREQUENCY
WIRE WOUND
TRANSFORMERS
EFD25 Platforms - SMT
Power Range: Up to 105W
Height: 13.7mm Max
Footprint: 32.0mm x 26.4mm Max
Topology: Forward and Flyback
Electrical Specifications @ 25°C — Operating Temperature -40°C to 130°C 5
Pri. Inductance (1,2,3-4,5,6) 21.4µH ±40%
Lk. Inductance (1,2,3-4,5,6) with (7,9,10,12) shorted 0.5µH MAX
(1,2,3-4,5,6) 4mW MAX
PA0700NL DCR (12-10) 45mW MAX
(9-7) 40mW MAX
Hi-Pot Pri-Sec 2250Vdc
K1 Factor 57.5
Pri. Inductance (1,2-3,4) 26.5µH ±15%
Lk. Inductance (1,2-3,4) with ( 7,8,9,10) shorted 0.36µH MAX
(1-4)=(2-3) 50mW MAX
PA1188 DCR (5-6) 30mW MAX
(10-7)=(9-8) 20mW MAX
(12-11) 16mW MAX
Hi-Pot Pri-Sec 1500Vdc
K1 Factor 326.4
Pri. Inductance (2,3-4,5) 30.9µH ±10%
Lk. Inductance (2,3-4,5) with (11,10,9,8) shorted 0.5µH MAX
PA1434NL DCR (2,3-4,5) 36mW MAX
(11,10,9,8) 19mW MAX
Hi-Pot Pri-Sec 1800Vrms
K1 Factor 354.6
Pri. Inductance (1-3) 199.7µH ±12%
Lk. Inductance (1-3) with (11,10,9,8) shorted 3.4µH MAX
(1-3) 142mW MAX
PA1468NL DCR (11-8) 73mW MAX
(11,10-9,8) 7.5mW MAX
Hi-Pot Pri-Sec 1800Vrms
K1 Factor 1075.7
Pri. Inductance (1-3) 300µH ±10%
Lk. Inductance (1-3) with (11,10,9,8) shorted 5µH MAX
(1-3) 120mW MAX
PA1543NL DCR (4-5) 70mW MAX
(12,11-10,9) 7.5mW MAX
(8-7) 265mW MAX
Hi-Pot Pri-Sec 1800Vrms
K1 Factor 1616.4
Pri. Inductance (2,3-4,5) 98µH ±30%
Lk. Inductance (2,3-4,5) with (7,8,9,10,11,12) shorted 1µH MAX
(2-4) 15.5mW MAX
PA1785NL DCR (3-5) 22mW MAX
(12,11,10-9,8,7) 2.5mW MAX
Hi-Pot Pri-Sec 1500Vrms
K1 Factor 24.6
1.0
3.67
PRELIMINARY
USA 858 674 8100 • Germany 49 7032 7806 0 • Singapore 65 6287 8998 • Shanghai 86 21 32181071 • China 86 755 33966678 • Taiwan 886 3 4643715
www.pulseeng.com 2 PRELIMINARY P674.B (11/08)
HIGH FREQUENCY
WIRE WOUND
TRANSFORMERS
EFD25 Platforms - SMT
Electrical Specifications @ 25°C — Operating Temperature -40°C to 130°C 5
Pri. Inductance (1,2-11,12) 3.61µH ±12%
Lk. Inductance (1,2-11,12) with (4,5,6,7,8,9) shorted 0.1µH MAX
(2-11) 5mW MAX
PA1799NL DCR (1-12) 6mW MAX
(4,5,6-7,8,9) 9.3mW MAX
Hi-Pot Pri-Sec 1500Vdc
K1 Factor 207.5
Pri. Inductance (1,2-3,4) 30.8µH ±7%
Lk. Inductance (1,2-3,4) with (8,9,10,11) shorted 0.75µH MAX
(1,2-3,4) 36mW MAX
PA1849NL DCR (10,11-8,9) 20mW MAX
(5-6) 130mW MAX
Hi-Pot Pri-Sec 1800Vrms
K1 Factor 354.0
Pri. Inductance (2-11) 23.7µH ±10%
Lk. Inductance (2-11) with (6,7) shorted 0.5µH MAX
(2-11) 14mW MAX
PA1927NL DCR (6-7) 14mW MAX
(3-1) 110mW MAX
Hi-Pot Pri-Sec 1500Vdc
K1 Factor 454.0
Pri. Inductance (1,2-3,4) 25µH ±10%
Lk. Inductance (1,2-3,4) with (5,6,7,8,9,10,11,12) shorted 0.5µH MAX
(1,2-3,4) 16mW MAX
PA2226NL DCR (5-6) 60mW MAX
(10,11,12-7,8,9) 2.5mW MAX
Hi-Pot Pri-Sec 2250Vdc
K1 Factor 431.0
Pri. Inductance (2,3-4,5) 40.5µH ±30%
Lk. Inductance (2,3-4,5) with (7,8,9,10,11,12) shorted 3.5µH MAX
(2-4) 22mW MAX
(3-5) 22mW MAX
PA2247NL DCR (9-10) 4mW MAX
(8-11) 4mW MAX
(12-7) 170mW MAX
Hi-Pot Pri-Sec 2000Vrms
K1 Factor 28.7
Pri. Inductance (1,2-3,4) 57.8µH ±10%
Lk. Inductance (1,2-3,4) with (5,6,7,8,11,12) shorted 0.46µH MAX
(1,2-3,4) 53mW MAX
PA2459NL DCR (5-6) 94mW MAX
(7,8-11,12) 33mW MAX
Hi-Pot Pri-Sec 1500Vrms
K1 Factor 524.5
PRELIMINARY
USA 858 674 8100 • Germany 49 7032 7806 0 • Singapore 65 6287 8998 • Shanghai 86 21 32181071 • China 86 755 33966678 • Taiwan 886 3 4643715
www.pulseeng.com 3 PRELIMINARY P674.B (11/08)
HIGH FREQUENCY
WIRE WOUND
TRANSFORMERS
EFD25 Platforms - SMT
Electrical Specifications @ 25°C — Operating Temperature -40°C to 130°C 5
Pri. Inductance (1,2-3,4) 40.5µH ±10%
Lk. Inductance (1,2-3,4) with (5,6,7,8,9,10,11,12) shorted n/a µH MAX
(1,2-3,4) 48mW MAX
(5-6) 167mW MAX
PA2464NL DCR (8-7) 17mW MAX
(12-11) 18mW MAX
(10-9) 102mW MAX
Hi-Pot Pri-Sec 1500Vrms
K1 Factor 436.4
Pri. Inductance (1,2-3,4) 12.2µH ±10%
Lk. Inductance (1,2-3,4) with (5,6,7,8,9,10,11,12) shorted 0.196 µH MAX
(1,2-3,4) 18mW MAX
(5-6) 72mW MAX
PA2532NL DCR (8-7) 9.3mW MAX
(12-11) 9.3mW MAX
(10-9) 35mW MAX
Hi-Pot Pri-Sec 1500Vrms
K1 Factor 131.5
Pri. Inductance (1,2-3,4) 11.2µH ±10%
Lk. Inductance (1,2-3,4) with (5,6,7,8,9,10,11,12) shorted n/a µH MAX
(1,2-3,4) 18mW MAX
PA2548NL DCR (5-6) 73mW MAX
(8-7) 20mW MAX
(12-11) 21mW MAX
Hi-Pot Pri-Sec 2250Vrms
K1 Factor 241.4
PRELIMINARY
HIGH FREQUENCY
WIRE WOUND
TRANSFORMERS
EFD25 Platforms - SMT
Mechanical
1. The temperature of the component (ambient plus temperature rise) must
be within the stated operating temperature range.
2. The above transformers and inductors have been tested and approved
by Pulse’s power IC partners and are sited in the appropriate datasheet
or evaluation board documentation at these companies. To determine
which IC and IC partners are matched with the above Pulse part num-
bers please consult the IC Cross Reference on the Pulse website.
3. For flyback topology applications, it is necessary to ensure that the trans-
former will not saturate in the application. The peak flux density (Bpk)
should remain below 2700Gauss. To calculate the peak flux density use
the following formula:
Bpk (Gauss) = K1_Factor * Ipk(A)
4. In high volt-µsec applications, it is important to calculate the core loss of
the transformer. Approximate transformer core loss can be calculated as:
CoreLoss (W) = 2.98E-13 * (Freq_kHz)1.63 * (DB_Gauss)2.63
where DB can be calculated as:
For Flyback Topology: DB = K1_Factor * D(A)
For Forward Topology: DB = K1_Factor * Volt-µsec
5. Optional Tape & Reel packaging can be ordered by adding a “T” suffix to
the part number (i.e. PA0700NL becomes PA0700NLT). Pulse complies
with industry standard tape and reel specification EIA481.
6. The “NL” suffix indicates an RoHS-compliant part number. Non-NL suf-
fixed parts are not necessarily RoHS compliant, but are electrically and
mechanically equivalent to NL versions. If a part number does not have
the “NL” suffix, but an RoHS compliant version is required, please con-
tact Pulse for availability.
Notes
www.pulseeng.com 4 PRELIMINARY P674.B (11/08)
This is a “Preliminary” product data sheet. Products mentioned on this data sheet are in development and in the process of being qualified. These products are not fully
released nor are they in production. Features, specifications and performance of products offered are subject to change without notice. Other brand and product names
mentioned herein may be products and/or registered trademarks of their respective owners. For current information on this product, please contact the Pulse office
nearest you and ask for the “Power Applications Engineer.” © Copyright, 2008. Pulse Engineering, Inc. All rights reserved.
For More Information:
Pulse Worldwide
Headquarters
12220 World Trade Dr.
San Diego, CA 92128
U.S.A.
www.pulseeng.com
TEL: 858 674 8100
FAX: 858 674 8262
Pulse South Asia
150 Kampong Ampat
#07-01/02
KA Centre
Singapore 368324
TEL: 65 6287 8998
FAX: 65 6280 0080
Pulse North Asia
No. 26
Kao Ching Rd.
Yang Mei Chen
Taoyuan Hsien
Taiwan, R. O. C.
32667
TEL: 886 3 4643715
FAX: 886 3 4641911
Pulse China
Headquarters
B402, Shenzhen Academy of
Aerospace Technology Bldg.
10th Kejinan Rd.
High-Tech Zone
Nanshan District
Shenzen, PR China 518057
TEL: 86 755 33966678
FAX: 86 755 33966700
Pulse North China
Room 1503
XinYin Building
No. 888 YiShan Rd.
Shanghai 200233
China
TEL: 86 21 32181071
FAX: 86 21 32181396
Pulse European
Headquarters
Einsteinstrasse 1
D-71083 Herrenberg
Germany
TEL: 49 7032 7806 0
FAX: 49 7032 7806 12
