US
UK
Taiwan
China
Singapore
+1-847-639-6400 sales@coilcraft.com
+44-1236-730595 sales@coilcraft-europe.com
+886-2-2264 3646 sales@coilcraft.com.tw
+86-21-6218 8074 sales@coilcraft.com.cn
+ 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 appr
oval.
Specification subject to change without notice.
Please check web site for latest infor
mation.
Document 328-1
Document 328-1 Revised 06/09/08
Transformer
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.
Input Output Primary Leakage Pri/sec
Part Output voltage Output
current inductance
1
inductance
2
DCR max
isolation
number
1
power (W) range (V) voltage (V) (A rms) min (mH) max (µH)
(mOhms)
(Vdc)
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)
Planar Magnetics
This planar transformer and inductor pair were designed
specifically for National Semiconductor’s LM5041 IC.
The A9786-A transformer is engineered for use in high-
current 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.
For National Semiconductor
LM5041 IC
0.45
11,43
1.23
31,24
0.285
7,24
0.31
7,87
0.175
4,45
0.12
3,05
1.48
37,59
1.32
33,53
1.21
30,73
1.15
29,21
max
max
max
0.004 /0,10
Recommended
Land Pattern
0.075
1,91
1
1
11
11
10
10
2
2
3
3
4
4
5
5
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.
Weight: 33.4 g
Terminations: Matte tin over nickel over brass
Tape and reel: 125/13″ reel 56 mm tape
11
4
1
2
5,6
3
9,10
7,8
Pri
Sec
8T
8T
1T
1T
4T
Au
x
US
UK
Taiwan
China
Singapore
+1-847-639-6400 sales@coilcraft.com
+44-1236-730595 sales@coilcraft-europe.com
+886-2-2264 3646 sales@coilcraft.com.tw
+86-21-6218 8074 sales@coilcraft.com.cn
+ 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 appr
oval.
Specification subject to change without notice.
Please check web site for latest infor
mation.
Planar Magnetics for National Semiconductor LM5041
Document 328-2 Revised 06/09/08
Document 328-2
Output Inductor
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.
Inductance
2
Inductance
2
Part @ 0 Adc @ 7.5 Adc DCR max
Isolation
3
Isat
4
Irms
5
number
1
(µH) min (µH) (mOhms) (Vdc) (A) (A)
A9787-AL_ 57 ±7% 47.0 17.0 1100 8.1 12.0
1
10
100
1000
0.1
10 100 1000
10000
1
Inductance (µH)
Frequency (MHz)
1
10
1000
100
0.1 1
10010
Current (A)
Inductance (µH)
Typical L vs Frequency
Typical L vs Current
0.45
11,43
1.23
31,24
0.30
7,62
0.34
8,64
0.12
3,05
F
or mounting
stability only
For mounting
stability only
1.30
37,59
1.145
29,08
1
1
4
4
max
max
max
0.004 /0,10
Recommended
Land Pattern
0.075
1,91
Weight: 31.0 g
Terminations: Matte tin over nickel over brass
Tape and reel: 125/13″ reel 56 mm tape
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.
1,2
3,4