© Coilcraft, Inc. 2007
Specifications subject to change without notice.
Please check our website for latest information.
Planar Transformer
Document 403
Document 403
Revised 05/10/07
For NSC LM5033 PWM Controller
for IBC Applications
8
3
1
4
5
6
10
Pri
Sec
Aux
0.800
20,32
Recommended
Land Pattern
0.190
4,83
0.250
6,35
0.095
2,41
Ø
0.110
2,79
Ø
0.080
2,03
0.360
9,14
max
0.810
20,57
max
0.920
23,37
max
0.006 /0,15
1
10
6
5
1
3
4
5
6
8
10
Dot indicates pin 1
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-AL
D
Packaging: D =13
″ machine 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.
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
design 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-A are available by
contacting Coilcraft or by visiting www.coilcraft.com.
Weight:
11.6 g
Terminations:
Matte tin over nckel over brass
Tape and reel:
200/13
″ reel 44 mm tape width
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.
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