Document 713-1
For Step-Up, Resonant
LPR4012 & Flyback Applications
Coupled Inductors
–
The LPR4012 miniature shielded coupled inductors are
only 1,1 mm high and 4 mm square.The excellent coupling
coefficient (k = 0.95) makes them ideal for use as flyback
transformers in DC-DC converters or as coupled inductors
in buck regulators to provide multiple outputs. The wide
selection of turns ratios makes them suitable for a variety
of voltage step-up and step-down applications. They can
also be used in autotransformer applications.
The high Isat and low DCR ratings of these low profile
parts provide high efficiency and excellent current handling
in a rugged, low cost design.
Custom inductance values and turn ratios are available
upon request.
Primary (L1)
SRF
inductance2 Turns
typ3
DCR max (Ohms)
Isat(A)4
120 drop ꢀ20 drop 320 drop ꢀ2°C rise 42°C rise
Irms(A)5
Part number1
ꢀ20 (ꢁµ)
ratio
L1
Lꢀ
(Mµz)
LPR4012-202AMR_
LPR4012-202BMR_
LPR4012-202DMR_
LPR4012-202LMR_
LPR4012-103BMR_
2.0
2.0
2.0
2.0
10.0
1 : 1.5
1 : 2
1 : 3
1 : 10
1 : 2
0.240
0.240
0.240
0.240
0.600
0.325
0.480
1.15
11.62
1.55
61.5
49.4
31.0
7.43
19.5
1.70
1.70
1.70
1.70
0.62
1.73
1.73
1.73
1.73
0.64
1.74
1.74
1.74
1.74
0.65
1.10
1.10
1.10
1.10
0.52
1.45
1.45
1.45
1.45
0.70
LPR4012-103DMR_
LPR4012-223BMR_
LPR4012-223DMR_
10.0
22.0
22.0
1 : 3
1 : 2
1 : 3
0.600
1.16
1.16
3.71
3.65
7.08
12.8
11.2
8.00
0.62
0.43
0.43
0.64
0.45
0.45
0.65
0.46
0.46
0.52
0.43
0.43
0.70
0.57
0.57
1. When ordering, please specify termination and packaging codes:
LPR421ꢀ-ꢀꢀ3XMRC
Termination: R = RoHS compliant matte tin over nickel over silver.
Special order: Q = RoHS tin-silver-copper (95.5/4/0.5) or
P = non-RoHS tin-lead (63/37).
Packaging: C = 7″ machine-ready reel. EIA-481 embossed plastic tape (1000 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 (3500 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.When leads are connected in parallel, SRF is the same value.
4. DC current at 25°C applied to L1 that causes the specified inductance drop from its value without current.
5. Current applied to L1 that causes the specified temperature rise from 25°C ambient.This information is for reference only and does not represent absolute
maximum ratings.
Refer to Doc 362 “Soldering Surface Mount Components” before soldering.
Document 713-1 Revised 08/25/16
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© Coilcraft Inc. 2016
This product may not be used in medical or high
risk applications without prior Coilcraft approval.
Specification subject to change without notice.
Please check web site for latest information.