Document 1295
For Texas Instruments
PMP7899 Reference Design
Flyback Transformer
• Developed for Texas Instruments PMP7899 Reference Design
for Non-Synchronous Flyback Converter with an Isolated Output
• 8 – 18 V input; 48 V, 1 A output
• Aux winding output 9 V, 20 mA
• 1500 Vrms, one minute primary and aux to secondary
isolation (hipot)
Core material Ferrite
Terminations RoHS tin-silver (96.5/3.5) over tin over nickel over phos
bronze. Other terminations available at additional cost.
Weight 25.9 g
Ambient temperature –40°C to +125°C
Maximum part temperature +125°C (ambient + temp rise)
Storage temperature Component: –40°C to +125°C.
Tray 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 ꢀMSLH 1 (unlimited floor life at <30°C /
85% relative humidity)
Failures in Time ꢀFITH / Mean Time Between Failures ꢀMTBFH
38 per billion hours / 26,315,789 hours, calculated per Telcordia SR-332
Packaging 24 parts per tray
PCB washing Tested to MIL-STD-202 Method 215 plus an additional
aqueous wash. See Doc787_PCB_Washing.pdf.
Inductance
at 0 Adc1
±±15 ꢀ(µH
Inductance
at Ipk2
min ꢀ(µH
Leakage
Inductance3
max ꢀ(µH
Ipk2
ꢀAH
Turns ratio
pri : sec pri : aux
Part
number
DCR max
ꢀOhmsH
Output4
NA6264-AL
2.56
2.176
0.0065 (pins 1
0.0065 (pins 2
–
–
3)
4)
0.060
1 : 6
1 : 1.5
16.5
48 V, 1 A
0.130 (pins 5
– 6)
0.110 (pins 11-8)
1. Inductance is for the primary with windings connected in parallel, measured at
300 kHz, 0.3 Vrms.
Dot indicates pin 1
2. Peak primary current drawn at minimum input voltage.
3. Leakage inductance is for the primary with the windings connected in parallel
and with the secondary winding shorted.
0.551
14,0
max
4. Output is for the secondary. Aux winding output is 9 V, 20 mA.
5. Electrical specifications at 25°C.
Refer to Doc 362 “Soldering Surface Mount Components” before soldering.
0.004/0,10 mm
1.116
28,1
1.30
33,02
max
0.079
2,0
1
0.039
1,0
1.024
26,0
0.108
2,75
1.10
28,0
2
11
Sec
12
7
Pri
1
6
1
4
3
8
Recommended
Land Pattern
1.053
26,75
max
5
Aux
6
12
0.148
3,75
0.148
3,75
7
6
0.657
16,7
Primary windings to be
connected on the PC board.
inches
mm
Dimensions are in
Document 1295 Revised 08/07/15
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© Coilcraft Inc. 2016
This product may not be used in medical or high
risk applications without prior Coilcraft approval.
Specification subject to change without notice.
Please check web site for latest information.