RA7040_16 Datasheet, PDF (1/2 Pages) Coilcraft lnc. – SMT Planar Transformer

Document 1257-1
SMT Planar Transformer ForTIUCC289712V/150W
Active Clamp Forward
• Developed for Texas Instruments UCC2897 Active Clamp
Forward (PMP9720 reference design)
• Designed for 48 – 60 Vdc input; 12 V, 13 A
• High efficiency; excellent DCR; very low leakage inductance;
1500 Vrms, one minute primary to secondary isolation.
• Provides 0.009″ (0.229 mm) clearance above the seating plane
Core material Ferrite
Terminations  Matte tin over nickel over brass.
Weight  12.7 g
Ambient temperature  –40°C to +125°C
Maximum part temperature  +165°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 (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  36 per tray
PCB washing  Tested to MIL-STD-202 Method 215 plus an additional
aqueous wash. See Doc787_PCB_Washing.pdf.
_{Part Turns}
  _number
N1 N2  Sec  Aux
RA7040-AL
66 3 3
Primary
  _inductance1
±20 (µH)
50
  _{inLdeuacktaagnec e}2 DCR max (mOhms)
max (µH)
Pri³â€ƒâ€ƒSec  Aux
0.55
10.75 4.25 61.1
Volt-time
  _{product typ}4
(Vµsec)
100
  _Output5
12 V, 13 A
1. Inductance is for the primary, measured on Agilent/HP 4284A at 200 kHz, 0.5 Vrms, 0 Adc with primary
windings connected in parallel.
2. Leakage Inductance is for the primary, measured at 200 kHz, 0.5 Vrms, 0 Adc with primary windings
connected in parallel and all secondary pins shorted.
3. Primary DCR measured with primary windings connected in parallel
4. Volt-time product is based on primary windings connected in parallel.
5. Output of the secondary, 12 V 13 A, is from pins 11 – 8, Output of the aux winding is 12 V.
6. Electrical specifications at 25°C.
Refer to Doc 362 “Soldering Surface Mount Components” before soldering.
3
2
Pri N1 N2
4
5
1
11
10
Sec
9
Aux
8
6
Primary windings to be connected
in parallel on the PC board.
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Document 1257-1  Revised 04/02/15
© 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.