Document 672
For STMicroelectronics PM8800
Flyback Transformers PoE Powered Device Controller
• Flyback transformers developed for STMicroelectronics
• Operates at 250 kHz with 30 – 60 V input
• Versions for 5 V and 3.3 V output in 20 Watt applications
• 1500 Vrms isolation primary and bias to secondary windings
Core material Ferrite
Weight 8.3 – 8.5 g
Terminations RoHS tin-silver over tin over nickel over phos
bronze. Other terminations available at additional cost.
Ambient temperature –40°C to +125°C
Storage temperature Component: –40°C to +125°C.
Packaging: –40°C to +80°C
Resistance to soldering heat Max three 40 second reflows at
+260°C, parts cooled to room temperature between cycles
Moisture Sensitivity Level (MSL) 1 (unlimited floor life at <30°C /
85% relative humidity)
Failures in Time (FIT) / Mean Time Between Failures (MTBF)
38 per billion hours / 26,315,789 hours, calculated per Telcordia SR-332
Packaging 200 per 13″ reel Plastic tape: 44 mm wide,
0.4 mm thick, 24 mm pocket spacing, 11.5 mm pocket depth
PCB washing Only pure water or alcohol recommended
Leakage
DCR max (Ohms)4
sec drive aux
Turns ratio6
pri:sec pri:drive pri:aux
Part
L at 0 A2
L at Ipk3
inductance5
max (µH)
Ipk3
(A)
number1
±10% (µH) min (µH)
pri
Output7
FA2706-BL_
FA2707-BL_
77.8
77.8
70.0
70.0
0.155 0.008 0.215 0.382
0.155 0.019 0.210 0.380
1.53
1.10
6.80:1
4.86:1
4.25:1 2.43: 1
4.25:1 2.43: 1
3.0 3.3 V, 6 A
3.0 5.0 V, 4 A
1. When ordering, please specify packaging code:
FA2707-BLD
4. DCR for the primary and the secondary is with windings connected in
parallel.
5. Leakage inductance is for the primary, measured with the secondary
and drive windings shorted.
6. Turns ratio is with the primary and the secondary windings connected in
parallel.
7. Output of the secondary is with the windings connected in parallel.
Aux winding output is 10 V; drive winding output is 5.5 V.
8. Electrical specifications at 25°C.
Packaging: D = 13″ machine ready reel. EIA-481 embossed plastic
tape (200 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 250 kHz, 0.2 Vrms.
3. Peak primary current drawn at minimum input voltage.
Refer to Doc 362 “Soldering Surface Mount Components” before soldering.
Dot indicates pin 1
12
11
3
4
1
0.069
1,75
1
12
12
0.028
0,70
Pri
Sec
0.685
17,40
Recommended
max
0.100
2,54
0.100
2,54
Land Pattern
9
10
6
5
7
1
8
6
0.748
19,0
0.130
3,30
0.699
17,00
Aux
Drive
2
7
The primary and secondary windings are to
be connected in parallel on the PC board.
0.425
10,80
max
0.004 / 0,10
0.799
20.30
inches
mm
0.950
24,13
max
Dimensions are in
Specifications subject to change without notice.
Please check our website for latest information.
Document672 Revised10/28/08
© Coilcraft, Inc. 2009