Document 736
For Linear Technology LT3751
Flyback Transformer Capacitor Charger Controller
•ꢀFlybacktransformerfortheLinearTechnologyLT3751Capacitor
Charger Controller
•ꢀ5 – 24 V input; 5 V, 3.6 A and 15 V, 1.2A outputs
•ꢀ1500 Vrms, one minute isolation from primary to secondary
windings
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 25.0 g
Ambient temperature –40°C to +85°C
Storage temperature Component: –40°C to +85°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.
Inductance Inductance
Leakage
Volt-time
product
DCR max (Ohms)3
sec ± sec 2 sec 3
Part
number
at0A1
at Ipk2
inductance4
Turns ratio5
Ipk2
±±0ꢀ(µH)
min (µH)
pri
max (µH) pri : sec ± : sec 2 : sec 3 (A) typ (V µsec)
HA3994-AL
7.50
6.75
0.018 0.020 0.031 0.031
0.22
1:0.5:1.5:1.5
5.0
37.5
1. Inductance is measured at 100 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 both windings of the primary with the second-
ary windings shorted.
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.
Dot indicates pin 1
0.108
1
2
1.10
28,2
4
1
2,75
12
1
12
Pri
Sec 1
0.039
1,00
5 – 24 V
5 V, 3.6 A
9
5
11
12
Recommended
Land Pattern
1.053
26,75
0.148
3,75
max
Sec 2
15 V, 1.2 A
8
6
0.079
2,00
0.148
3,75
Sec 3
–15 V, 1.2 A
Parts manufactured prior
to December 2011 may
be marked differently.
7
Primary windings to be connected
in parallel on PC board.
0.551
14,0
max
0.004 / 0,10
1.024
26,0
1.35
34,29
inches
mm
max
Dimensions are in
Document 736 Revised 12/15/11
US +1-847-639-6400 sales@coilcraft.com
UK +44-1236-730595 sales@coilcraft-europe.com
Taiwan +886-2-2264 3646 sales@coilcraft.com.tw
China +86-21-6218 8074 sales@coilcraft.com.cn
Singapore + 65-6484 8412 sales@coilcraft.com.sg
© Coilcraft Inc. 2013
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.
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