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A9845-AL Datasheet

SMT Planar Transformer

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Document 345
SMTPlanarTransformer – A9845-AL
Coilcraft’s surface mount planar transformers are ideal for
applications that require high efficiency in a low-profile
package. They are designed to perform in push-pull topolo-
gies operating at 200 – 300 kHz. The auxiliary winding can
be used to control input current to PWMs.
Planar transformers offer high power densities along with
great reliability and repeatability.
The A9845-A has a smaller footprint and lower profile than
our other planar transformers. The circular windings provide
very low DCR and excellent leakage inductance values.
To complete your design, Coilcraft offers a wide variety
of power inductors for use as input and output chokes. To
request free evaluation samples, contact Coilcraft or visit
www.coilcraft.com.
Part
number1
A9845-AL_
Output
power (W)
10
Input
voltage
range (V)
36 – 75
Output
voltage (V)
3.3
Output
current
(A rms)
2.0
Primary
Leakage
inductance1 inductance
min (mH) max (µH)
1.50
1.4
DCR max (Ohms)
pri sec aux
0.80 0.0105 0.120
Pri/sec
isolation
(Vrms)
1200
1. When ordering, please specify packaging code:
A8945-ALD
Packaging: D = 13machine ready reel. EIA-481 embossed plastic
tape (250 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. Inductance measured between pins 2 and 4 at 250 kHz, 0.1 Vrms,
0 Adc.
2. Storage and ambient operating temperature range: –40°C to +85°C.
3. Electrical specifications at 25°C.
1
0.860 max
21,84
5
0.325 max
8,26
0.060
1,52
1.100 max
27,94
8
7
6
0.924
23,47
0.814
0.180
4,57 0.080
2,03
20,68
8
1
7
0.070
1,78
‡
5
6
Recommended
Land Pattern
0.224
5,69
0.224
5,69
0.110
2,79
‡
2
12T
Primary 3
12T
4
1
Auxiliary 6T
5
0.100
2,54
0.006 /0,15
Weight:
10.6 g
Terminations: Matte tin over nickel over brass
Tape and reel: 250/13reel 56 mm tape width
For packaging data see Tape and Reel Specifications section.
6
2T
7 Secondary
2T
8
© Coilcraft, Inc. 2007
Specifications subject to change without notice.
Please check our website for latest information. Document 345 Revised 06/19/07


Part Number A9845-AL
Description SMT Planar Transformer
Maker Coilcraft
Total Page 1 Pages
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