Document 752-1
Miniature Step-Up / Flyback Transformers
• Can be used as step-up or flyback transformers in DC-DC
converters or as autotransformers
• Perfect for low voltage step-up in energy harvesting applications
These shielded parts are only 3.5 mm high and 6 mm
square. The excellent coupling coefficient (k = 0.95)
makes them ideal for use in a variety of applications,
such as flyback converters and step-up pulse trans-
former applications.
The high
Isat
and low DCR ratings of these low profile
parts provide high efficiency and excellent current han-
dling in a rugged, low cost design.
Custom inductance values and turn ratios are available
upon request.
+
D
+
L1
L2
C
V
OUT
Part
number
1
LPR6235-253PML_
LPR6235-123QML_
LPR6235-752RML_
LPR6235-752SML_
Primary (L1) DCR max
Turns inductance
2
(Ohms)
ratio ± 20% (µH) L1
L2
1
:
20
1
:
50
1
:
90
1
:
100
25
12.5
7.5
7.5
0.20
0.080
0.085
0.085
58
200
267
305
SRF
typ
3
Isat
4
(MHz) (A)
580
382
257
244
0.7
0.9
1.6
1.6
V
IN
C
PWM
–
–
Typical Step-Up / Flyback Converter
1. When ordering, please specify
packaging
code:
LPR6235-253PMLC
Packaging: C
= 7″ machine-ready reel. EIA-481 embossed plastic
tape (350 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.
D
= 13″ machine-ready reel. EIA-481 embossed plastic
tape. Factory order only, not stocked (1500 parts per
full reel).
2. Inductance is measured at 100 kHz, 0.1 Vrms, 0 Adc on an Agilent/HP
4284A LCR meter or equivalent.
3. SRF measured using an Agilent/HP 4191A or equivalent.
4. DC current applied to L1, at which the inductance drops 10% from its
value without current.
5. Electrical specifications at 25°C.
Refer to Doc 362 “Soldering Surface Mount Components” before soldering.
Core material
Ferrite
Weight
460 – 480 mg
Terminations
RoHS compliant silver-palladium-platinum-glass frit.
Other terminations available at additional cost.
Ambient temperature
–40°C to +85°C with
Irms
current, +85°C to
+125°C with derated current
Storage temperature
Component: –40°C to +125°C.
Packaging: –40°C to +80°C
Winding to winding isolation
100 V
Resistance to soldering heat
Max three 40 second reflows at
+260°C, parts cooled to room temperature between cycles
Moisture Sensitivity Level (MSL)
1 (unlimited floor life at <30°C /
85% relative humidity)
Mean Time Between Failures (MTBF)
26,315,789 hours
Failures in Time (FIT)
38 per one billion hours
Packaging
350/7″reel; 1500/13″ reel Plastic tape: 12 mm wide,
0.3 mm thick, 8 mm pocket spacing, 3.68 mm pocket depth
Recommended pick and place nozzle
OD: 6.2 mm; ID:
≤
3.1 mm
PCB washing
Only pure water or alcohol recommended
Specifications subject to change without notice.
Please check our website for latest information.
Document 752-1
Revised 10/01/09
© Coilcraft, Inc. 2009
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