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Document 426
Planar Transformer ForMaximMAX5069A
PWM Controller
The B0860-C is approved by Maxim for use with their
MAX5069A high-frequency, current-mode, pulse-width
modulation (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, isolated or nonisolated power supply ap-
plications. It offers high efficiency in a low-profile pack-
age and features split primary and secondary windings,
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 B0860-C 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
number1 power (W) range (V) nom (V) (A peak) min (µH) max (µH) (mOhms)
Turns ratio4
pri : sec  pri : aux
B0860-CL_ 180
36 – 72
12
15 187.0
0.25
Pri: 38.0
10 : 4
Sec: 4.0
Aux: 120.0
10 : 3
1. When ordering, specify a packaging code:
B0860-CLD
Packaging: D = 13machine ready reel. EIA-481 embossed plastic
tape (200per 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 2 and 4 at 250
kHz, 0.1 Vrms, 0 Adc.
3. Leakage inductance measured between pins 2 and 4 at 250 kHz, 0.1 Vrms,
0 Adc with pins 6, 8 and 10 shorted.
4. Turns ratio is with the primary windings and secondary windings connected
in series.
5. Storage and ambient operating temperature range: –40°C to +85°C.
6. Electrical specifications at 25°C.
1
0.810
20,57
max
2
3
4
5
0.360
9,14
max
Dot indicates pin 1
10
8
0.095
2,41
1
0.800
20,32
10
0.250
6,35
2
Pri 3
0.920
23,37
max
6
Ø
0.080
2,03
5
6
Recommended
Land Pattern
Ø
0.110
2,79
4
1
Aux
5
0.006 /0,15
Weight:
11.8 g
Terminations: Matte tin over nickel over brass
Tape and reel: 200/13reel  44 mm tape width
6
8 Sec
10
Document 426  Revised 05/10/07