D1766-AL Datasheet, PDF (1/1 Pages) Coilcraft lnc. – Flyback Transformer

Document 529
Flyback Transformer ForLinearTechnology
LTC4267 PoE PD Interface
The D1766-AL multiple-output transformer was devel-
oped for use with Linear Technology LTC4267 Power
over Ethernet IEEE 802.3af PD Interface with Integrated
Switching Regulator. It is ideal for use in telecommuni-
cations isolated converters and isolated power supplies.
This low-profile transformer is designed for an input
voltage of 36 – 72 Volts. It features interleaved primary
and secondary windings to minimize leakage induc-
tance and 1500 Vrms isolation between windings.
Coilcraft can also custom engineer a transformer to
meet your specific requirements. For free evaluation
samples, contact Coilcraft or visit www.coilcraft.com.
Part
number¹
D1766-AL_
Inductance
at 0 Adc²
±10% (µH)
221
Inductance
at Ipk³
min (µH)
DCR max
(Ohms)
Leakage
Inductance⁴
max (µH)
200
0.420 (pins 1 – 3)
5.1
0.013 (pins 8 – 5)
0.013 (pins 7 – 6)
0.015 (pins 10 – 9)
0.030 (pins 12 – 11)
Turns ratio
Ipk³
pri : S1 pri : S2,S3 (A)
9.6 : 1
24 : 1
1.5
Outputs
3.3 V, 0.5 A
2.5 V, 1.5 A
1.8 V, 2.5 A
1. When ordering, please specify packaging code:
D1766-ALD
Packaging: D = 13″ machine-ready reel. EIA-481 embossed plastic
tape (175 parts per full reel).
B = Less than full reel. In tape, but not machine ready. To
have a leader and trailer added ($25 charge), use
code letter D instead.
2. Inductance is for the primary, measured at 200 kHz, 1.1 Vrms, 0 Adc.
3. Peak primary current drawn at minimum input voltage.
4. Leakage inductance is for the primary and is measured with secondary
windings shorted.
5. Operating temperature range –40°C to +125°C.
6. Electrical specifications at 25°C.
Dot indicates pin 1
1
12
0.810 _max
20,57
D1766-AL
6
7
1.181 _max
30,00
1
Primary
3
12 3.3 V
S3
11
10 2.5 V
S2
9
8,7 1.8 V
S1
5,6 GND
0.450
11,43
max
0.084
2,13
6
0.969
24,6
0.827
21,0
0.004 /0,10
0.028
7 ^0,72
0.130
3,30
1
0.930
23,62
Pins 9,8,7 to be connected on the board.
Pins11,10 to be connected on the board.
0.050
1,27
Recommended
Land Pattern
1
12 _0.118
3,0
Weight:
12.7 g
Terminations: Tin-silver over tin over nickel over phos bronze
Tape and reel: 175/13″ reel, 44 mm tape width
For packaging data see Tape and Reel Specifications section.
0.118
3,0
Specifications subject to change without notice.
Please check our website for latest information.
Document 529 Revised 09/11/06
© Coilcraft, Inc. 2008