Switching inductors

Features

• Storage and filter chokes for low power switch mode power supplies.
• Wide range of standard products available.
• Wound on toroidal core, for vertical and horizontal PCB mounting.
• Compact size

Technical description

Linear storage chokes are widely used in switching power supply circuits which operate in forward mode. Their task is to level the output current by storing the energy during the conduction time of the power semiconductors and by releasing it during the off time. The filter inductors are normally used in output circuits of the switching power supplies in order to reduce the voltage and current ripple. In both cases the inductors operate with high DC currents.

UTK switching inductors are designed for high storage energy values and low losses at high switching frequencies. In order to minimize the physical dimensions they are wound on iron powder toroidal cores and operate with flux density close to saturation. The windings on a single layer provide low interwinding capacitance and good noise immunity up to high frequencies.

A wide range of standard products is available for the most common applications. In order to satisfy specific requirements UTK Component can develop special products according to the customers’ needs. Storage and filter chokes for single-chip DC/DC converters of the National Semiconductor SIMPLE SWITCHER‚ family (LM259X e LM267X) are also available.

UTK Component switching inductors have the following characteristics:
• Compact size, wound on iron powder toroidal cores, for vertical and horizontal PCB mounting.
• Nominal currents from 0.25A to 10 A.
• Inductance values from 15µH to 10000mH
• High working frequency, up to 100KHz
• Low losses

UTK Component controls closely the production during the process and at the end of it, granting the quality and reliability of the product. The carried out tests include:
• Visual inspection
• Value of the reference parameters

Applications




Output choke in a Forward converter.


 






Buck DC/DC power conversion stage.

 

 







Boost DC/DC power conversion stage.

 

 


Reference parameters

Inductance Lp

Nominal value of the inductance without DC current. Measured with LCR meter (Ambient temp 25°C, frequency 10KHz, drive UAC,rms=0.5Vac). Tolerance +/- 25%.

Nominal current In

Nominal DC offset current.

Winding resistance Rcu

Winding resistance measured with LCR meter.

Frequency Fmax

Maximum working frequency.


 

Code

In (A)

Ln (µH)

f max (KHz)

Dimension (De x Di x H)

Terminals (ř)

B-500251

0.25

8000

60

17.5x6.5x8

0.25

B-500510

0.5

2000

60

17.5x6.5x8

0.32

B-500520

0.5

8000

60

23x10x9.2

0.32

B-501010

1

500

60

17.5x6.5x8

0.50

B-501020

1

2000

60

23.5x10x9.5

0.50

B-501030

1

4000

60

26x11x13

0.50

B-502510

2.5

60

60

17x7x7.5

0.75

B-502520

2.5

300

60

24x9.5x9.5

0.75

B-502530

2.5

600

60

26x11x13

0.75

B-502540

2.5

1200

60

30x11.5x14.5

0.75

B-502550

2.5

2400

60

42x18.5x14.5

0.75

B-503510

3.5

40

60

17x6.8x7.7

0.85

B-503520

3.5

80

60

22x11x8.5

0.85

B-503530

3.5

150

60

24.8x12.5x10

0.85

B-503540

3.5

220

60

29x12.8x12.8

0.85

B-503550

3.5

350

60

35x18x13

0.85

B-503560

3.5

470

60

40.5x20x13

0.85

B-503570

3.5

600

60

42x22.5x16.5

0.85

B-505010

5

25

60

17.5x6.5x8.2

1.1

B-505020

5

50

60

22.5x10.5x8.5

1.1

B-505030

5

100

60

25.5x11.5x12

1.1

B-505040

5

150

60

29.5x12.5x13.5

1.1

B-505050

5

200

60

35.5x18.13.5

1.1

B-505060

5

300

60

41x19.5x13.5

1.1

B-505070

5

500

60

42x22.5x16.5

1

B-505080

5

900

60

44.5x20x19

1.1

B-507510

7.5

20

60

23x10x9

1.30

B-507520

7.5

40

60

26x11.5x12.5

1.30

B-507530

7.5

70

60

30x12x14

1.30

B-507540

7.5

100

60

36x17x14

1.30

B-507550

7.5

150

60

41.5x19x14

1.30

B-507560

7.5

220

60

43x22x17.5

1.30

B-507570

7.5

400

60

46x19x20

1.30

B-507580

7.5

600

60

52x19x20

1.30

B-510010

10

15

60

23.5x9.5x9.5

1.60

B-510020

10

30

60

26x11x13

1.60

B-510030

10

50

60

30x11.5x14.5

1.60

B-510040

10

80

60

36.5x18x14.5

1.60

B-510050

10

100

60

41.5x19x14.5

1.60

B-510060

10

150

60

43x21x18

1.60

B-510070

10

300

60

50x21x18

1.60

 

 
 
 
UTK COMPONENT - Via del Progresso 35/37 - 36025 Noventa Vicentina VI - Tel. (+39) 0444 760770 r.a. - Fax (+39) 0444 860963