Document 594
For National Semiconductor
Flyback Transformer LM5001 Switch Mode Regulator
The FA2636-AL surface mount flyback transformer was
developed specifically for the National Semiconductor
LM5001 High Voltage Switch Mode regulator for iso-
lated and non-isolated flyback topologies.
It is designed to operate in continuous mode at 250 kHz
with an input voltage of 16 – 36 Volts. This industry-
standard size EP13 transformer features 1500 Vrms
isolation from the primary and auxiliary winding to the
secondary. Output of the auxiliary winding is 7.5 V
used to power the IC.
Coilcraft can also custom design transformers with
voltage, inductance and DCR values to meet your
specific requirements.
For free evaluation samples, contact Coilcraft or order
them on-line at www.coilcraft.com.
Inductance Inductance
Leakage
inductance
max (ꢁµ)5
DCR max (Ohms)4
Turnsratio6
pri :sec pri :aux (A)
8 : 2 8: 3 1.0
Part
at 0 A2
at Ipk3
Ipk3
number1 ±±0ꢀ (ꢁµ)
min (ꢁµ)
pri
bias
sec
Output
5.0 V, 1.0 A
FA2636-AL_ 160
144
0.225
0.340 0.078
1.60
1. When ordering, please specify packaging code:
FA2636-ALD
2. Inductance is for the primary, measured at 250 kHz, 0.2 Vrms, 0 Adc.
3. Ipk is peak primary current drawn at minimum input voltage.
4. DCR for the secondary is per winding.
5. Leakage inductance measured between pins 3 and 2 with all other pins
shorted.
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.
6. Turns ratio is with the secondary windings connected in parallel.
7. Operating temperature range –40°C to +85°C.
8. Electrical specifications at 25°C.
Dot above pin1
8
9
3
Pri
Sec
0.500
12,70
max
7
6
2
4
0.004/0,10
0.039
1,00
Aux
5
0.699
17,75
max
0.050
1,27
0.028
0,70
Secondary windings to be connected
in parallel on the PC board.
0.512
13,00
0.061
1,55
0.590
14,99
5
1
6
0.530
13,46
Recommended
Land Pattern
max
Weight:
6.28 g
10
1
Terminations: Tin-silver over tin over nickel over phos bronze
Tape and reel: 175/13″ reel 32 mm tape width
0.098
2,50
0.098
2,50
Specifications subject to change without notice.
Please check our website for latest information.
Document594 Revised09/03/08
© Coilcraft, Inc. 2008