CR7983 -85-AL

Document 1090
Isolation Transformers
For Analog Devices ADuM4070
Isolated Switching Regulator
• Developed to work with Analog Devices ADuM4070 Isolated
switching regulator with integrated feedback
• Power rating: 2 Watts
• 5000 Vrms, one second isolation from primary to secondary.
Core material Ferrite
Terminations Tin-silver-copper over tin over nickel over phos bronze
Weight 10.1 g
Ambient temperature –40°C to +125°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,
32 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
Pri / output voltages
Part Inductance2Turns output
output
output
number1
min (µH)
ratio
pri
(pin 5)
(pins 6 & 8)
(pin 7)
CR7983-CL_
256
1 : 2
5 V +3.3 to +15 V
0 V
No output
CR7984-CL_
256
1 : 3
5 V +12 to +24 V +6 to +12 V
0 V
CR7985-CL_
256
1 : 5
5 V +5 to +15 V
0 V
–5 to –15 V
1. When ordering, please specify a packaging code:
CR7985-CLD
Packaging:D=13″ machine ready reel. EIA-481 embossed plastic
tape (175 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.
11
Primary
LeakageVolt-time
inductance4 product5
max (µH) (V-µsec)
0.75
18.0
0.75
18.0
0.72
18.0
2. Inductance is for the primary, measured from pins 12 – 11 at 1 kHz, 0.1 Vrms.
3. DCR is for each winding of the primary and secondary.
4. Leakage inductance is for the primary windings, measured from pins 12 – 11
with all secondary windings shorted.
5. Based on VIN max, FSW min and number of primary turns
6. Electrical specifications at 25°C.
Refer to Doc 362 “Soldering Surface Mount Components” before soldering.
5 Output
2
8
1
7
12
DCR max
(Ohms)3
pri sec
0.190 0.350
0.170 0.450
0.170 2.00
Output Secondary
6 Output
Primary windings and secondary
windings to be connected in
series on the PC board.
Dimensions are in
Analog Devices is a trademark of Analog Devices, Inc.
inches
mm
Document 1090 Revised 05/03/13
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