GA3459 – 3460

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, one minute isolation from primary to secondary
windings
• Flux shield minimizes EMI emission
Core material Ferrite
Terminations RoHS tin-silver (96.5/3.5) 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.
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 24 per tray
PCB washing Tested with pure water or alcohol only. For other solvents,
see Doc787_PCB_Washing.pdf.
Part
number
InductanceInductance
Leakage
DCR max (mOhms)3inductance4
at 0 A1
at Ipk2
Turns ratio5 Ipk2
±10% (µH)
min (µH)
pri sec
max (µH)
pri : sec
(A)
GA3459-BL
GA3460-BL
5.0
2.5
4.25
2.25
7.70
5.63
515
400
1. Inductance is measured at 50 kHz, 0.1 Vrms.
2. Peak primary current drawn at minimum input voltage.
3. DCR for the primary is with the windings connected in parallel.
4. Leakage inductance is for the primary with windings connected in parallel
and with the secondary winding shorted.
0.10
0.06
GA3459-BL
1
2
3
4
12
12
1.024 1.285
max
26,0 32,65
Recommended
Land Pattern
1.10
28,2
0.039
1,00
0.157
4,00
0.108
2,75
0.079
2,00
GA34xx-BL
Internal
code
XXXX Y
0.551max
14,0
0.004 / 0,10
Dimensions are in
inches
mm
0.157
4,00
Flux
shield
6
Pri
Sec
9
10
11
12
7
1
2
3
4
1
1
20
50
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.
1.053 max
26,75
Dot
indicates
pin 1
1 : 10
1 : 10
GA3460-BL
Flux
shield
6
Pri
Sec
12
11
10
9
7
Primary windings to be connected in parallel
on PC board. Connect pin 6 to ground.
Note: The primary windings of these
transformers DO NOT have the same pinouts.
Document 722 Revised 05/15/15