HA3905-CL

Document 729
Flyback Transformer
For Microsemi
PoE PD Power Supply
• Developed for use with Microsemi UC3844 Current Mode
Controller and LX1752 Buck Regulator
• 1500 Vrms, one minute isolation from primary, auxiliary and
reset to secondary; 500 Vrms from primary and reset to auxiliary
• Designed for 36 V – 57 V input; 200 kHz
Core material Ferrite
Terminations RoHS tin-silver over tin over nickel over phos bronze.
Other terminations available at additional cost.
Weight 6.7 g
Ambient temperature –40°C to +85°C
Storage temperature Component: –40°C to +85°C.
Tape and reel 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)
Mean Time Between Failures (MTBF) 26,315,789 hours
Packaging 175 per 13″ reel Plastic tape: 32 mm wide, 0.5 mm thick,
28 mm pocket spacing, 12.93 mm pocket depth
PCB washing Only pure water or alcohol recommended
Part
L at 0 A2
L at Ipk3
Input
number1
±10% (µH) min (µH) voltage (V)
HA3905-CL_
27.0
24.3
37 –57
DCR max
Leakage L4Turns Ipk3
(Ohms)
max (µH)
ratios
(A)
Outputs5
0.170 (pri)
1.9
3.75 : 1(pri : sec )
1.2
5 V, 2.5 A (sec)
0.015 (sec)
1.36 : 1(pri : aux)
12 V, 20 mA (aux)
0.385 (aux)
1 : 1(pri : reset)
0.371 (reset)
1. When ordering, please specify packaging code:
HA3905-CLD
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 250 kHz, 0.1 Vrms, 0 Adc.
3.Ipk is peak primary current drawn at minimum input voltage.
4. Leakage inductance measured on the primary winding with all secondary pins shorted.
5. Output of the seconday is with the windings connected in parallel.
6. Electrical specifications at 25°C.
Refer to Doc 362 “Soldering Surface Mount Components” before soldering.
5
Dot above pin1
10
9
Pri
0.500 max
12,70
Reset
4
0.004 /0,10
0.039
1,00
0.512
13,00
5
6
7
1
0.699 max
17,75
Aux
0.028
0,70
6
0.080
2,03
1
0.590
14,99
0.050
1,27
2
Secondary windings to be connected
in parallel on the PC board
Recommended
Land Pattern
0.530 max
13,46
1
Dimensions are in
Sec
3
10
0.098
2,50
0.098
2,50
inches
mm
US +1-847-639-6400 [email protected]
UK +44-1236-730595 [email protected]
Taiwan +886-2-2264 3646 [email protected]
China +86-21-6218 8074 [email protected]
Singapore + 65-6484 8412 [email protected]
Document 729 Revised 08/13/09
© Coilcraft Inc. 2012
This product may not be used in medical of high
risk applications without prior Coilcraft approval.
Specification subject to change without notice.
Please check out web site for latest information.