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Document 896-1
Flyback Transformer ForLinearTechnologyLT3799
Isolated LED Controller
• Developed for Linear Technology for use with their LT3799
Isolated LED Controller with active power factor correction
• Mounted on LT3799 Demo Board
• Universal input; 24 Watt output
• 3000 Vrms, one minute primary to secondary isolation;
500 Vrms, one minute primary to bias isolation
Core material Ferrite
Terminations  RoHS compliant tin-silver over tin over copper. Other
terminations available at additional cost.
Weight  13.9 g
Ambient temperature  –40°C to +85°C
Storage temperature  Component: –40°C to +85°C.
Tray packaging: –40°C to +80°C
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  100 per tray
PCB washing  Only pure water or alcohol recommended
Part
number
Inductance Inductance
Leakage
at 0 A1 min at Ipk2 DCR max inductance
±10% (µH) (µH)
(Ohms)max (µH)3
JA4429-AL
400
320
0.252 (Pri)
0.126 (Sec)
0.149 (Bias)
7.5
Turns ratio
Pri : Sec  Pri : Bias
1 : 0.24  1 : 0.24
Ipk2
(A)
1.3
Output4
24 V, 1.0 A
1. Inductance measured at 100 kHz, 0.1 Vrms, 0 Adc using an Agilent/
HP 4263B impedance analyzer or equivalent.
2. Peak primary current drawn at minimum input voltage.
3. Leakage inductance is for the primary and is measured with the sec-
ondary shorted.
4. Output is for the secondary. Bias winding output is 24 V, 20 mA.
5. Electrical specifications at 25°C.
Dot indicates pin 1
0.680
17,30
max
1
Pri
2
3
Bias
4
7
Sec
6
0.590
15,0
0.110
2,79
min
0.197
5,0
0.025
0,64
0.830
21,1
45
1
0.197
5,0
0.590
15,0
8
0.830
21,1
max
18
Dimensions are in
inches
mm
0.055
1,4
45
Recommended
PC Board Layout
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
Document 896-1  Revised 11/14/17
© Coilcraft Inc. 2017
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.