Document 1067
SMT Flyback Transformer
For Maxim
MAX17498B
• Flyback transformer developed for Maxim for the MAX17498B
Evaluation Kit
• Designed to operate with +18 Vdc to +36 Vdc input
• 3500 Vrms, one minute isolation primary to secondary windings
Core material
Ferrite
Weight
7.1 g
Terminations
RoHS tin-silver over tin over nickel over phos bronze.
Other terminations available at additional cost.
Ambient temperature
–40°C to +85°C
Maximum part temperature
+125°C (ambient + temp rise)
Storage temperature
Component: –40°C to +125°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)
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
Tested to MIL-STD-202 Method 215 plus an additional
aqueous wash. See
Doc787_PCB_Washing.pdf.
Part
number
1
MA5237-EL_
L at 0 A
2
±10% (µH)
60.0
L at
Ipk
3
min (µH)
54.0
DCR max (Ohms)
4
pri
sec
aux
0.11
0.035
0.17
Leakage
inductance
5
max (µH)
0.565
Turns ratio
6
pri :sec
pri : aux
1
:
0.5
1
:
0.25
Ipk
3
(A)
1.5
Output
7
5 V, 1.5 A
1. When ordering, please specify
packaging
code:
MA5237-ELD
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 500 kHz, 0.1 Vrms.
3. Peak primary current drawn at minimum input voltage.
Packaging:
Dot indicates pin 1
1
4. DCR for the secondary is with windings connected in parallel.
5. Leakage inductance is for the primary, measured with the secondary
windings shorted.
6. Turns ratio is with the the secondary windings connected in parallel.
7. Output of the secondary is with the windings connected in parallel.
Aux winding output is 2.5 V, 20 mA.
8. Electrical specifications at 25°C.
Refer to Doc 362 “Soldering Surface Mount Components” before soldering.
Internal code
12
0.028
0,70
0.100
2,54
6
0.069
1,75
0.100
2,54
1
1
12
12
11
Sec
Pri
2
5
Aux
0.130
3,30
MA5237-EL
XXXX Y
0.750 max
19,05
7
Recommended
Land Pattern
7
8
0.699
17,00
0.748
19,0
6
The secondary windings are to be
connected in parallel on the PC board.
0.425
max
10,8
0.799
20.30
0.950
max
24,13
0.004 / 0,10
Dimensions are in
inches
mm
Document 1067
Revised 07/15/15
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