Document 372-1
For National Semiconductor
Planar Magnetics LM5025 and LM5034
This planar transformer and planar inductor pair is de-
signedspecificallyfortheNationalSemiconductorLM5110
Gate Driver and LM5025 Active Clamp Voltage Mode
PWMController. ThesepartsarealsospecifiedbyNSCfor
use with their LM5034 Dual Interleaved Controller.
The B0357-B transformer is engineered for use in high
current telecom power supply applications that require
high efficiency in a low-profile package.
The main winding of the B0358-CC inductor serves as an
output choke, while the auxiliary winding controls input
current to the PWM.
RequestfreeevaluationsamplesbycontactingCoilcraftor
visiting www.coilcraft.com.
Transformer
Output
current
(A rms)
Primary
inductance2
min (µH)
Leakage
inductance3
max (µH)
Pri/sec
isolation
(Vdc)
DCR max
(mOhms)
Part
Output
power (W)
Output
voltage (V)
number1
B0357-BL_
100
3.3
30.0
320.0
0.55
Primary: 55.0
Secondary: 1.0
1500
1. When ordering, please specify packaging code:
B0357-BLD
3. Leakage inductance measured between pins 1 and 2 at 100 kHz,
0.1 Vrms, 0 Adc with secondary pins shorted.
4. Ambient temperature range:
5. Storage temperature range: Component:
Packaging:
–
40°C to +85°C
40°C to +85°C
40°C to +80°C
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.
6. Resistance to soldering heat: Three reflows at >217°C for 90 seconds
(+260°C 5°C for 20 – 40 seconds), allowing parts to cool to room
temperature between.
7. Electrical specifications at 25°C.
2. Inductance measured on an Agilent/HP 4284 between pins 1 and 2 at
250 kHz, 0.1 Vrms, 0 Adc.
3
0.920
max
1
2
23,37
0.800
20,32
0.125
3,18
Pri
Sec
1
1
4
3
4
3
0.200
5,08
0.810
20,57
0.400
10,16
0.250
6,35
4
max
2
12 : 2
2
0.110
2,79
Ø
0.080
2,03
Recommended
Land Pattern
Ø
0.360
9,14
max
Weight:
11.3 g
Terminations: Matte tin over nickel over brass
Tape and reel: 200/13″ reel 44 mm tape width
0.006/0,15
Specifications subject to change without notice.
Please check our website for latest information.
Document372-1 Revised10/31/08
© Coilcraft, Inc. 2008