B0357-BL Datasheet, PDF (1/2 Pages) Coilcraft lnc. – Planar Magnetics

Document 372-1
Planar Magnetics ForNationalSemiconductor
LM5025 and LM5034
This planar transformer and planar inductor pair is de-
signed specifically for the National Semiconductor LM5110
Gate Driver and LM5025 Active Clamp Voltage Mode
PWM Controller. These parts are also specified by NSC for
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.
Request free evaluation samples by contacting Coilcraft or
visiting www.coilcraft.com.
Transformer
Part
number¹
B0357-BL_
Output
power (W)
100
Output
voltage (V)
3.3
Output
current
(A rms)
30.0
Primary
inductance²
min (µH)
320.0
Leakage
inductance³
max (µH)
0.55
DCR max
(mOhms)
Primary: 55.0
Secondary: 1.0
Pri/sec
isolation
(Vdc)
1500
1. When ordering, please specify packaging code:
B0357-BLD
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.
2. Inductance measured on an Agilent/HP 4284 between pins 1 and 2 at
250 kHz, 0.1 Vrms, 0 Adc.
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: –40°C to +85°C
5. Storage temperature range: Component: –40°C to +85°C
Packaging: –40°C to +80°C
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.
1
0.810
20,57
max
2
0.920
23,37
max
4
3
0.200
0.400 5,08
10,16
Ø
0.080
2,03
0.800
20,32
1
4
2
3
Recommended
Land Pattern
0.125
3,18
0.250
6,35
Ø
0.110
2,79
1
3
Pri
Sec
2
4
12 : 2
0.360 _max
9,14
0.006 /0,15
Weight:
11.3 g
Terminations: Matte tin over nickel over brass
Tape and reel: 200/13″ reel 44 mm tape width
Specifications subject to change without notice.
Please check our website for latest information.
Document 372-1 Revised 10/31/08
© Coilcraft, Inc. 2008