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Magnetics for 300 W Power Supply
with PFC

  • Specified by Texas Instruments in Reference Design SLUU341.
  • Flyback transformer for 5 W bias supply: HA3950-AL, listed as T201;
    Operates with an input voltage range of 100 – 450 V.
  • Gate Drive Transformer: HA3858-AL, listed as T301
  • Isolation: 3000 Vrms primary to secondary; 500 Vrms windings to core
  • RoHS-compliant. Tin-silver over tin over copper terminations

SPECIFICATIONS


 Flyback Transformer
Part number
Click to get parts
L at 0A1
±10% (mH)
L at Ipk2
min (mH)
DCR max3
(Ohms)
Leakage L
max (µH)4
Turns ratio
pri sec : P1
Ipk2
(A)
Output5
HA3950-AL 2.3 1.61 0.860 (pri)
0.109 (sec)
0.080 (P1)
16.5 1 : 0.16 : 0.11 0.3 15 V, 0.33 A
1 Inductance is for the primary, measured at 100 kHz, 0.1 Vrms, 0 Adc using an Agilent/HP 4263B impedance analyzer or equivalent
2 Ipk: Peak primary current drawn at minimum input voltage.
3 DCR measured at 25°C. For other operating temperatures, use this DCR at Temperature calculator.
4 Leakage inductance is for the primary with the secondary winding shorted.
5 Output of the P1 winding is 10 V, 20 mA.
6 Ambient temperature range: −40°C to +85°C
7 Storage temperature range: Component:−40°C to +85°C
Packaging trays:−40°C to +80°C
8 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.
 Gate Drive Transformer
Part number
Click to get parts
Turns ratio Primary L1
±25% (µH)
Leakage L2
max (µH)
DCR max3
(Ohms)
Volt-time
product
(V-µsec)
SRF
typ4
(MHz)
Capacitance
max (pF)5
HA3858-AL 1 : 1 : 1 460 1.87 (pri [A])
2.06 (pri [B])
0.38 (pri [A])
0.472 (pri [B])
0.424 (sec)
150 1.15 8.48 (pri)
28.66 (sec)
1 Inductance is for each primary, measured at 200 kHz, 0.4 Vrms, 0 Adc using an Agilent/HP 4263B impedance analyzer or equivalent
2 Leakage inductance is for each primary with the secondary winding shorted.
3 DCR measured at 25°C. For other operating temperatures, use this DCR at Temperature calculator.
4 SRF is measured with the coils connected in series using an Agilent/HP 4192 or equivalent.
5 Capacitance of the primary is measured from pin 1 to pin 3. Capacitance of the secondary is measured with the primaries shorted.
6 Ambient temperature range: −40°C to +85°C
7 Storage temperature range: Component:−40°C to +85°C
Packaging trays:−40°C to +80°C
8 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