HA3905-CL 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 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.
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
HA3905-CL_
L at 0 A²
±10% (µH)
27.0
L at Ipk³
min (µH)
24.3
Input
voltage (V)
37 –57
DCR max
(Ohms)
0.170 (pri)
0.015 (sec)
0.385 (aux)
0.371 (reset)
Leakage L⁴
max (µH)
Turns
ratios
1.9 3.75 : 1 (pri : sec )
1.36 : 1 (pri : aux)
1 : 1 (pri : reset)
Ipk³
(A)
Outputs⁵
1.2 5 V, 2.5 A (sec)
12 V, 20 mA (aux)
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.
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
6
7
4
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
These parts are preproduction products for electrical evaluation only.
Specification subject to change without notice.
Document 729 Revised 08/13/09
© Coilcraft, Inc. 2009