A9786-AL

Document 328-1
Planar Magnetics
For National Semiconductor
LM5041 IC
This planar transformer and inductor pair were designed
specifically for National Semiconductor’s LM5041 IC.
The A9786-A transformer is engineered for use in highcurrent telecom power supply applications that require high
efficiency in a low-profile package.The auxiliary winding
can be used to control input current to PWMs. It offers
very high current handling capability and extremely low
DC resistance in a low profile package.
Coilcraft’s A9787-A inductor is designed as the output
choke for the LM5041.
Planar magnetics offer high power densities along with
great reliability and repeatability. Windings are etched
into a printed circuit board, ensuring high efficiency and
consistency.
Request free evaluation samples by contacting Coilcraft
or visiting www.coilcraft.com.
Transformer
Input
OutputPrimary Leakage
Pri/sec
DCR maxisolation
Part Output voltage Output current inductance1 inductance2
(mOhms)(Vdc)
number1 power (W) range (V) voltage (V)
(A rms)
min (mH)
max (µH)
A9786-AL_
150
36 – 75
2.5
60.0
1.25
0.90
Primary: 62.5 (1 – 3)
1100
Secondary: 0.91 (5,6 – 9,10)
200 (4 – 11)
1. When ordering, please specify packaging code:
A9786-ALD
Packaging:D
=13″ machine-ready reel. EIA-481 embossed plastic
tape (125 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 measured on an Agilent/HP 4284 between pins 1 and 3 at
250 kHz, 0.1 Vrms, 0 Adc.
3. Leakage inductance measured between pins 1 and 3 at 100 kHz, 0.1 Vrms,
0 Adc with all secondary pins shorted.
4. Operating temperature range: –40°C to +85°C.
5. Electrical specifications at 25°C.
Refer to Doc 362 “Soldering Surface Mount Components” before soldering.
5,6
0.45
max
11,43
0.004 /0,10
5
4
1.23
max 2
31,24
1
1
0.285
7,24
Pri
0.075
1,91
7,8
2
3
10
11
0.31
7,87
2
5
Recommended
Land Pattern
Sec
1T
9,10
8T
3
11
10
8T
1.32
33,53
1.21
30,73
1.15
29,21
1.48
max
37,59
3
1T
1
4
Aux
4T
11
4
0.12
3,05
0.175
4,45
US +1-847-639-6400 [email protected]
UK +44-1236-730595 [email protected]
Taiwan +886-2-2264 3646 [email protected]
China +86-21-6218 8074 [email protected]
Singapore + 65-6484 8412 [email protected]
Weight: 33.4 g
Terminations: Matte tin over nickel over brass
Tape and reel: 125/13″ reel 56 mm tape
Document 328-1 Revised 06/09/08
© 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.
Document 328-2
Planar Magnetics for National Semiconductor LM5041
Output Inductor
Inductance2
Part
@ 0 Adc
number1
(µH)
A9787-AL_
57 ±7%
Inductance2
@ 7.5 Adc
min (µH)
47.0
DCR max
(mOhms)
17.0
1. When ordering, please specify packaging code:
A9787-ALD
Packaging:D
=13″ machine-ready reel. EIA-481 embossed plastic
tape (125 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.
Typical L vs Frequency
Isat4
(A)
8.1
Irms5
(A)
12.0
Typical L vs Current
1000
Inductance (µH)
Inductance (µH)
(Vdc)
1100
2. Inductance measured on an Agilent/HP 4284 at 250 kHz, 0.1 Vrms.
3. Isolation measured from pins 1,2 to the core.
4. DC current at which inductance drops 10% (typ) from its value without
current.
5. Current that causes a 40°C rise from 25°C ambient.
6. Operating temperature range: –40°C to +85°C.
7. Electrical specifications at 25°C.
Refer to Doc 362 “Soldering Surface Mount Components” before soldering.
1000
100
10
1
Isolation3
1
0.1
10
100
Frequency (MHz)
1000
100
10
1
10000
0.1
1
Current (A)
10
100
1,2
0.45
max
11,43
0.004 /0,10
3,4
For mounting
stability only
1.30
max
37,59
1.145
29,08
0.12
3,05
1
4
1.23
max
31,24
1
For mounting
stability only
0.34
8,64
0.30
7,62
4
0.075
1,91
Recommended
Land Pattern
Weight: 31.0 g
Terminations: Matte tin over nickel over brass
Tape and reel:125/13″ reel 56 mm tape
US +1-847-639-6400 [email protected]
UK +44-1236-730595 [email protected]
Taiwan +886-2-2264 3646 [email protected]
China +86-21-6218 8074 [email protected]
Singapore + 65-6484 8412 [email protected]
Document 328-2 Revised 06/09/08
© 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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