HA3905_12 Datasheet, PDF (1/1 Pages) Coilcraft lnc. – Flyback Transformer

Document 729
Flyback Transformer ForMicrosemi
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
  ^number1
±^  1L0a%t
0 A²
(µH)
 _mLiant
Ipk³
(µH)
Input
voltage (V)
HA3905-CL_
27.0
24.3
37 –57



DCR max
(Ohms)
  _{Leakage L}4
max (µH)
Turns ^  Ipk³
ratios
(A)
  _Outputs5
0.170 (pri)
1.9
0.015 (sec)
0.385 (aux)
0.371 (reset)
3.75 : 1 (pri : sec ) 1.2 5 V, 2.5 A (sec)
1.36 : 1 (pri : aux) 12 V, 20 mA (aux)
1 : 1 (pri : reset)
1. When ordering, please specify packaging code:
Packaging:
HA3905-CLD
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 second-
ary 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.
0.500
12,70
max
0.039
1,00
5
0.530
13,46
max
Dot above pin1
01.76,9795max
0.512
13,00
0.004 /0,10
0.028
0,70
6
0.080
2,03
1
0.590
14,99
Recommended
Land Pattern
0.050
1,27
5
10
9
Pri
Sec
3
Reset
4
6
7
1
Aux
2
Secondary windings to be connected
in parallel on the PC board
1
Dimensions
are in
inches
mm
0.098
10 _2,50
0.098
2,50
US [phone] [e-mail]
UK [phone] [e-mail]
Taiwan [phone] [e-mail]
China [phone] [e-mail]
Singapore + 65-6484 8412 [e-mail]
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.