Document 1198
Forward Mode Transformer
For Maxim MAX17599
PWM Controller
• Forward mode transformer for the Maxim MAX17599 Active
Clamp Current-Mode PWM Controller
• 18 – 36 V input; 12 V, 3.3 A output
• 1500 Vrms, one minute isolation from primary to secondary
and gate windings
• Specified on reference design MAXREFDES48#
Core material
Ferrite
Terminations
RoHS tin-silver (96.5/3.5) over tin over nickel over phos
bronze.
Weight
10.5 g
Ambient temperature
–40°C to +85°C
Storage temperature
Component: –40°C to +125°C.
Tape and reel 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
175 per 13″ reel Plastic tape: 44 mm wide, 0.4 mm thick,
28 mm pocket spacing, 11.9 mm pocket depth
PCB washing
Tested with pure water or alcohol only. For other solvents,
see Doc787_PCB_Washing.pdf.
Part
number
1
RA6999-AL_
Inductance
at 0 A
2
min (µH)
70
DCR max (mOhms)
pri
sec
gate
20.5
29.5
36.4
Leakage
inductance
max (µH)
0.35
Turns ratio
pri : sec
pri : gate
1
:
1.125
1
:
0.375
Output
3
12 V, 3.3 A
1. When ordering, please specify a
packaging
code:
RA6999-ALD
Packaging: D
= 13″ machine ready reel. EIA-481 embossed plastic tape (175 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 measured at 250 kHz, 0.1 Vrms.
3. Output is for the secondary winding. Output of the gate winding is 4 V, 0.25 A
4. Electrical specifications at 25°C.
Refer to Doc 362 “Soldering Surface Mount Components” before soldering.
7
Gate
9
1
10
Pri
3
Sec
6
Dimensions are in
inches
mm
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 1198
Revised 03/05/18
© Coilcraft Inc. 2018
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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