GA3429-BL Datasheet, PDF (1/1 Pages) Coilcraft lnc. – Flyback Transformers

Document 733
Flyback Transformers ForLinearTechnologyLT3573
Isolated Flyback Converter
• Designed for the LT3573 Isolated Flyback Converter
• 1500 Vrms isolation from primary and bias to secondary;
500 Vrms isolation from primary to bias
• The bias winding provides power to the chipset
Core material Ferrite
Terminations RoHS tin-silver over tin over nickel over phos
bronze. Other terminations available at additional cost.
Weight 3.9 to 4.1 g
Ambient temperature –40°C to +85°C
Storage temperature Component: –40°C to +85°C.
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 250 per 13″ reel Plastic tape: 32 mm wide,
0.5 mm thick, 20 mm pocket spacing, 11.2 mm pocket depth
PCB washing Only pure water or alcohol recommended
Part
number¹
Inductance
at 0 A²
±10% (µH)
GA3429-BL_ 24.0
GA3430-BL_ 25.0
GA3431-BL_ 25.0
Inductance
at Ipk³
min (µH)
21.6
22.5
22.5
DCR max (mOhms)⁴
pri sec bias
95 7.5 123
90 15
95
90 5.0
70
Leakage
Input
inductance Turns ratio⁶ Ipk³ voltage
max (µH)⁵ pri : sec : bias (A)
(V)
Output⁷
0.566
0.685
0.945
4:1:1
5:1:1
7:1:1
2.1 20 – 28 3.3 V, 1.5 A
2.1 10 – 14 5.0 V, 1.0 A
2.1 10 – 14 3.3 V, 1.5 A
1. When ordering, please specify packaging code:
GA3431-BLD
Packaging: D = 13″ machine-ready reel. EIA-481 embossed plastic
tape (250 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 is for the primary, measured at 250 kHz, 0.3 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 4 with all secondary
pins shorted.
6. Turns ratio is with the secondary windings connected in parallel.
7. Output is with the secondary windings connected in parallel. Bias winding
output: 3.3 V, 20 mA (GA3429 and GA3431); 5.0 V, 20 mA (GA3430).
8. Electrical specifications at 25°C.
Refer to Doc 362 “Soldering Surface Mount Components” before soldering.
6
3
5
Pri
Sec
4
7
2
8
Bias
Dot above pin1
0.450 _max
11,43
0.041
1,05
0.600max
15,24
0.004 /0,10
1
0.50 _max
12,7
4
0.413
10,50
Dimensions are in
inches
mm
0.024
0,60
8
0.080
2,03
0.460
11,68
0.050
1,27
5
0.098
2,50
1
Recommended ^0.098
Land Pattern ^2,50
1
Secondary windings to be
connected in parallel on PC board
Specifications subject to change without notice.
Please check our website for latest information.
Document 733 Revised 04/13/09
© Coilcraft, Inc. 2009