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Document 403
Planar Transformer For NSC LM5033 PWM Controller
for IBC Applications
The B0853-A was designed specifically for the National
Semiconductor LM5033 high voltage PWM controller. This
planar transformer can be used in push-pull, half-bridge
and full-bridge topologies.
It is ideal for use in high-current power supply applications
such as open loop intermediate bus converters (IBC)
and closed loop voltage mode converters. It offers high
efficiency in a low-profile package and features a split
secondary, a separate auxiliary winding and 1500 Vdc
primary to secondary isolation.
Coilcraft’s Planar Prototyping Kit C356 was used to de-
sign this transformer. No tooling or additional parts were
required. To order the kit, contact Coilcraft or purchase
on-line at http://order.coilcraft.com.
Free evaluation samples of B0853-AL are available by
contacting Coilcraft or by visiting www.coilcraft.com.
Input Output Output Primary Leakage
Part Output voltage voltage current  inductance2 inductance3 DCR max Turns ratio4
 number1 power (W) range (V) nom (V) (A peak) min (µH)
max (µH) (mOhms) pri : sec : aux
B0853-AL_
200
40 – 60
10
20 46.8
0.10
Pri:   10.4
5 : 4 : 4
Sec: 4.0  
Aux: 160.0
1. When ordering, please specify packaging code:
B0853-ALD
Packaging: D = 13machine ready reel. EIA-481 embossed plastic
tape (200 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 3 and 4 at 250
kHz, 0.1 Vrms, 0 Adc.
3. Leakage inductance measured between pins 3 and 4 at 100 kHz, 0.1 Vrms,
0 Adc with pins 6 and 10 shorted.
4. Turns ratio is with the secondary windings connected in series.
5. Storage and ambient operating temperature range: –40°C to +85°C.
6. Electrical specifications at 25°C.
Dot indicates pin 1
1
0.810
20,57
max
3
4
5
0.920
23,37
max
10
8
6
0.095 0.190
2,41 4,83
1
0.800
20,32
10 0.250
6,35
Ø
0.080
2,03
56
Recommended
Land Pattern
Ø
0.110
2,79
3
Pri
4
1
Aux
5
6
8 Sec
10
0.360
9,14
max
0.006 /0,15
Weight:
11.6 g
Terminations: Matte tin over nckel over brass
Tape and reel: 200/13reel  44 mm tape width
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 403  Revised 05/10/07
© 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.