Coupled Inductors for SEPIC Applications–LPD4012 Series

Document 580-2 Revised 02/15/11

Document 580-2

Document 580-2 Revised 11/09/15

Coupled Inductor Core and Winding Loss Calculator

This web-based utility allows you to enter frequency, peak-to-peak

(ripple) current, and

Irms current to predict temperature rise and

overall losses, including core loss. Go to online calculator.

Coupling

Leakage

Irms (A)

10%

20%

30%

both

one

(µH)

(Ohms)

(MHz)

typ

(µH)

drop

drop

drop

LPD4012-331NR_

0.33 ±30%

0.042

255

0.94

0.06

5.2

5.4

5.6

1.87

2.65

LPD4012-561NR_

0.56 ±30%

0.087

185

0.95

0.08

3.7

3.8

3.9

1.30

1.84

LPD4012-821NR_

0.82 ±30%

0.100

130

0.97

0.09

3.2

3.3

3.4

1.21

1.72

LPD4012-152NR_

1.5 ±30%

0.185

86

0.97

0.11

2.50

2.81

2.91

1.15

1.62

LPD4012-222NR_

2.2 ±30%

0.235

70

0.98

0.14

2.30

2.40

2.50

0.95

1.35

LPD4012-332NR_

3.3 ±30%

0.320

48

0.98

0.16

1.80

1.90

2.00

0.75

1.06

LPD4012-472MR_

4.7 ±20%

0.500

39

0.98

0.18

1.60

1.70

1.80

0.65

0.92

LPD4012-562MR_

5.6 ±20%

0.620

32

0.99

0.20

1.50

1.60

1.60

0.55

0.78

LPD4012-682MR_

6.8 ±20%

0.530

31

0.99

0.22

1.20

1.52

1.63

0.60

0.86

LPD4012-822MR_

8.2 ±20%

0.600

29

0.99

0.24

1.10

1.20

1.30

0.55

0.78

LPD4012-103MR_

10 ±20%

0.750

25

0.99

0.26

0.98

1.00

1.10

0.50

0.71

LPD4012-153MR_

15 ±20%

1.13

21

0.99

0.30

0.90

0.92

0.94

0.43

0.60

LPD4012-223MR_

22 ±20%

1.63

15

0.99

0.34

0.70

0.82

0.84

0.34

0.48

LPD4012-333MR_

33 ±20%

1.83

12

>0.99

0.41

0.37

0.57

0.58

0.31

0.44

LPD4012-473MR_

47 ±20%

2.52

8.8

>0.99

0.51

0.33

0.39

0.40

0.28

0.39

LPD4012-683MR_

68 ±20%

3.23

7.8

>0.99

0.66

0.27

0.36

0.37

0.25

0.36

LPD4012-823MR_

82 ±20%

3.66

7.3

>0.99

0.75

0.27

0.27

0.29

0.23

0.31

LPD4012-104MR_

100 ±20%

4.76

6.1

>0.99

0.86

0.22

0.28

0.29

0.20

0.27

LPD4012-124MR_

120 ±20%

5.54

5.3

>0.99

0.98

0.21

0.26

0.27

0.19

0.27

LPD4012-154MR_

150 ±20%

6.90

4.6

>0.99

1.19

0.18

0.26

0.27

0.17

0.23

LPD4012-184MR_

180 ±20%

8.75

4.1

>0.99

1.40

0.16

0.21

0.23

0.14

0.18

LPD4012-224MR_

220 ±20%

11.24

3.3

>0.99

1.66

0.15

0.16

0.17

0.12

0.17

LPD4012-334MR_

330 ±20%

17.00

2.8

>0.99

2.45

0.13

0.16

0.16

0.10

0.14

1. Please specify

termination and packaging codes:

LPD4012-334MRC

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 shown for each winding, measured at 100 kHz, 0.1 Vrms,

0 Adc on an Agilent/HP 4284A LCR meter or equivalent. When leads

are connected in parallel, inductance is the same value. When leads

are connected in series, inductance is four times the value.

3. DCR is for each winding. When leads are connected in parallel, DCR

is half the value. When leads are connected in series, DCR is twice the

value.

4. SRF measured using an Agilent/HP 4191A or equivalent. When leads

are connected in parallel, SRF is the same value.

5. Leakage Inductance is for L1 and is measured with L2 shorted.

6. DC current at 25°C that causes the specified inductance drop from its

value without current. It is the sum of the current flowing in both windings.

7. Equal current when applied to each winding simultaneously that

causes a 40°C temperature rise from 25°C ambient. This information is

for reference only and does not represent absolute maximum ratings.

8. Maximum current when applied to one winding that causes a 40°C

temperature rise from 25°C ambient. This information is for reference

only and does not represent absolute maximum ratings.

9. Electrical specifications at 25°C.

Refer to Doc 639 “Selecting Coupled Inductors for SEPIC Applications.”

Refer to Doc 362 “Soldering Surface Mount Components” before soldering.