Document 722
Flyback Transformers
For Linear Technology LT3751
Capacitor Charger Controller
• Flyback transformer for the Linear Technology LT3751
Capacitor Charger Controller
• For charging capacitors to 500 V
• GA3459-BL: 5 – 24 V input
GA3460-BL: 12 – 24 V input
• 1500 Vrms isolation from primary to secondary windings
Core material
Ferrite
Terminations
RoHS tin-silver over tin over nickel over phos
bronze. Other terminations available at additional cost.
Weight
24.2 – 27.5 g
Ambient temperature
–40°C to +125°C
Storage temperature
Component: –40°C to +125°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
24 per tray
PCB washing
Only pure water or alcohol recommended
Part
number
GA3459-BL
GA3460-BL
1.
2.
3.
4.
Inductance
at 0 A
1
±10% (µH)
5.0
2.5
Inductance
at
Ipk
2
min (µH)
4.25
2.25
DCR max (mOhms)
3
pri
sec
7.70
515
5.63
400
Leakage
inductance
4
max (µH)
0.10
0.06
Turns ratio
5
pri : sec
1 : 10
1 : 10
Ipk
2
(A)
20
50
Inductance is measured at 50 kHz, 0.1 Vrms.
Peak primary current drawn at minimum input voltage.
DCR for the primary is with the windings connected in parallel.
Leakage inductance is for one winding of the primary with the secondary
winding shorted.
Dot indicates pin 1
1
12
5. Turns ratios are with the primary windings connected in parallel.
6. Electrical specifications at 25°C.
Refer to Doc 362 “Soldering Surface Mount Components” before soldering.
0.108
2,75
1
1.10
28,2
12
GA3459-BL
1
2
3
4
0.039
1,00
GA34xx-BL
CCIXXXX
6
1.053 max 0.157
26,75
4,00
0.079
2,00
Recommended
Land Pattern
Pri
9
10
11
12
Sec
7
0.157
4,00
1.024
26,0
GA3460-BL
1
2
3
4
6
0.551max
14,0
Pri
12
11
10
9
Sec
7
1.173
29,80
1.285 max
32,65
0.004 / 0,10
Dimensions are in
inches
mm
Primary windings to be connected
in parallel on PC board.
Specifications subject to change without notice.
Please check our website for latest information.
Document 722
Revised 05/21/09
© Coilcraft, Inc. 2009
COILCRAFT [ Coilcraft lnc. ]
