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SD25-331-R Fiches technique(PDF) 2 Page - Cooper Bussmann, Inc.

No de pièce SD25-331-R
Description  Switching Regulators
Download  4 Pages
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Fabricant  COOPER [Cooper Bussmann, Inc.]
Site Internet  http://www.cooperbussmann.com
Logo COOPER - Cooper Bussmann, Inc.

SD25-331-R Fiches technique(HTML) 2 Page - Cooper Bussmann, Inc.

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Inductor Selection: Buck Converters
FFiigguurree 2
2 A
Apppplliiccaattiioonn P
Paarraam
meetteerrss::
• Switching frequency= 250kHz
• Input voltage range= 12V±10%
• Max ripple current = 220mA
• Output Voltage= 5.0V
S
Stteepp 1
1.. C
Caallccuullaattee tthhee D
Duuttyy C
Cyyccllee
•Vo = output voltage
•Vi = Max input voltage
•D = Vo / Vi
• D = 5/13.2 = 0.379
S
Stteepp 2
2.. C
Caallccuullaattee tthhee V
Voollttaaggee A
Accrroossss tthhee IInndduuccttaannccee
•V1 = Vi-Vo (Switch on)
•V1 = 13.2 - 5 = 8.2V
•V1 = -Vo (Switch off)
•V1 = - Vo = - 5V
S
Stteepp 3
3.. C
Caallccuullaattee tthhee R
Reeqquuiirreedd IInndduuccttaannccee
•L = Vl.dt/di
• L = (8.2 x 0.379/250 x 10
3)/0.22
• L = 56
μH
Inductor Selection: Boost Converters
FFiigguurree 3
3 A
Apppplliiccaattiioonn P
Paarraam
meetteerrss::
• Switching frequency= 100kHz
• Input voltage range= 4.5-5.5V
• Max ripple current = 100mA
• Output Voltage= 12.0V
S
Stteepp 1
1.. C
Caallccuullaattee tthhee D
Duuttyy C
Cyyccllee::
•Vo= output voltage
•Vi = Max input voltage
• D = 1 - (Vi / Vo)
• D = 1 – (5.5/12.0) = 0.542
S
Stteepp 2
2.. C
Caallccuullaattiinngg tthhee vvoollttaaggee aaccrroossss tthhee iinndduuccttaannccee
•V1 = Vi (Switch on)
•V1 = 5.5V
•V1 = Vo – Vi (Switch off)
•V1 = 12 – 5.5 = 6.5V
S
Stteepp 3
3.. C
Caallccuullaattiinngg tthhee rreeqquuiirreedd iinndduuccttaannccee
•L = Vl.dt/di
• L= (5.5 x 0.542/100 x 10
3)/0.1
• L= 298
μH
5V
Output
Voltage
Output
Cap
Buck
Inductor
Freewheeling
Diode
Switch
12V
Input
Voltage
Figure 2:
Buck Inductor Example
12V
Output
Voltage
Output
Cap
5V
Input
Voltage
Figure 3:
Boost Inductor Example
Switch
Diode
Boost
Inductor
Typical Applications Using Inductors for Switching Regulators
Media Players
Backlight Displays
Laptop Computers
Industrial Test Equipment
Digital Cameras
Mobile Phones


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