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Forward Mode Transformers
for 15 Watt Applications

  • Developed for Texas Instruments LM5015 Two-Switch Forward Regulator
  • Designed for two-switch forward topology operating at 250 kHz;
    Input voltage range: 36 – 75 V
  • FCT1-50M2S is referenced on TI application note AN-1724 as CA2983-CL
    and on AN-1725 as GA2983-CL
  • Five versions for 3.3, 5, 9, 12 and 15 Volt output
  • 1500 Vrms primary to secondary isolation
  • Auxiliary winding output: 10 V, 20 mA
  • For 8 Watt Applications, the FCT1-xxxK2SL series is recommended by NSC
  • RoHS-compliant. 260°C compatible. Tin-silver over tin over nickel over phos bronze terminations

SPECIFICATIONS

Dimensions    Schematic     Tape and reel specifications   
3D models
Part number1
Click for samples
Inductance2
nom (µH)

DCR max (Ohms)3

Leakage
inductance4
max (µH)

Turns ratio5

Output6
pri sec aux pri : sec pri : aux
FCT1-33M2SL_ 705 55 6.0 320 0.510 1 : 0.24 1 : 0.67 3.3 V, 4.6 A
FCT1-50M2SL_ 705 55 13.5 320 0.425 1 : 0.33 1 : 0.67 5.0 V, 3.0 A
FCT1-90M2SL_ 705 55 33.5 320 0.340 1 : 0.57 1 : 0.67 9.0 V, 1.67 A
FCT1-120M2SL_ 705 55 46.5 320 0.340 1 : 0.71 1 : 0.67 12 V, 1.25 A
FCT1-150M2SL_ 705 55 72.5 320 0.310 1 : 0.90 1 : 0.67 15 V, 1.0 A
1 When ordering, please specify packaging code: e.g. FCT1-150M2SLD
  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 measured at 250 kHz, 0.5 Vrms, 0 Adc.
3 DCR for the secondary is measured with the windings connected in parallel.
DCR at 25°C. For other operating temperatures, use this DCR at Temperature calculator.
4 Leakage inductance is for the primary winding and is measured with the secondary windings shorted.
5 Turns ratio for secondary is with the windings connected in parallel. 
6 Output of the secondary is with the windings connected in parallel. Auxiliary winding output is 10 V, 20 mA.
7 Ambient temperature range: −40°C to +85°C
8 Storage temperature range: Component: −40°C to +85°C
Tape and reel packaging: −40°C to +80°C
9 Resistance to soldering heat: Three reflows at >217°C for 90 seconds (+260°C ±5°C for 20 – 40 seconds), allowing parts to cool to room temperature between.
10 Electrical specifications at 25°C.
Refer to Soldering Coilcraft Components before soldering.
PCB washing: Tested to MIL-STD-202 Method 215 plus an additional aqueous wash. More info.

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Updated: October 30, 2017