 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
FAN103 Datasheet(PDF) 5 Page - Fairchild Semiconductor |
|
||||||||||||||||||||||||||||||
FAN103 Datasheet(HTML) 5 Page - Fairchild Semiconductor |
|
|
5 / 16 page  AN-8033 © 2009 Fairchild Semiconductor Corporation www.fairchildsemi.com Rev. 1.0.1 • 5/6/10 5 Then, the power supply input power and transformer input power at 70% nominal output voltage (operating point B) are given as: @ @ 0.7 NN OO IN B B VI P η ⋅⋅ = (8) .@ @ 0.7 NN OO IN T B SB VI P η ⋅⋅ = (9) The overall efficiency at the minimum output voltage (operating point C) can be approximated as: min @ min N OO F C N OF O VV V VV V ηη + ≅⋅ ⋅ + (10) where Vomin is the minimum output voltage. The secondary-side efficiency at minimum output voltage (operating point C) can be approximated as: min @ min N OO F SC S N OF O VV V VV V ηη + ≅⋅ ⋅ + (11) Then, the power supply input power and transformer input power at the minimum output voltage (operating point C) are given as: min @ @ N OO IN C C VI P η ⋅ = (12) min .@ @ N OO IN T C SC VI P η ⋅ = (13) (Design Example) Assuming the overall efficiency is 70% at operating point A (nominal output voltage and current), the secondary-side efficiency is obtained as: 22 33 0.7 0.788 S ηη ≅= = Then, the input powers of the power supply and transformer are obtained as: 3.75 5.36 0.7 IN NN OO V P I W η = == . 2/3 3.75 4.76 0.7 OUT IN T S P P W η = == The efficiencies at 70% of nominal output voltage are: @ 0.7 0.67 0.7 NN OO F B NN OF O VV V VV V ηη ⋅+ ≅⋅ ⋅ = ⋅+ @ 0.7 0.756 0.7 NN OO F SB S NN OF O VV V VV V ηη ⋅+ ≅⋅ ⋅ = ⋅+ Then, the input powers of the power supply and transformer at 70% of nominal output voltage are obtained as: @ @ 0.7 3.91 IN B NN OO B V P I W η ⋅ = = .@ @ 0.7 3.47 IN T B NN OO SB V P I W η ⋅ = = The efficiencies at the minimum output voltage are: min @ min 0.540 N OO F C N OF O VV V VV V ηη + ≅⋅ ⋅ = + min @ min 0.608 N OO F SC S N OF O VV V VV V ηη + ≅⋅ ⋅ = + The input powers of the power supply and transformer at the minimum output voltage are obtained as: @ min @ 1.74 IN C N OO C V P I W η = = .@ min @ 1.54 IN T C N OO SC V P I W η = = [STEP-2] Determine the DC Link Capacitor (CDL) and the DC Link Voltage Range It is typical to select the DC link capacitor as 2-3µF per watt of input power for universal input range (90-265VRMS) and 1µF per watt of input power for European input range (195V~265VRMS). With the DC link capacitor chosen, the minimum DC link voltage is obtained as: min min 2 (1 ) 2( ) IN ch DL LINE DL L PD VV Cf − =⋅ − ⋅ (14) where VLINE min is the minimum line voltage, CDL is the DC link capacitor, fL is the line frequency, and Dch is the DC link capacitor charging duty ratio defined as shown in Figure 8, which is typically about 0.2. The maximum DC link voltage is given as: max max 2 DL LINE VV =⋅ (15) where VLINE max is the maximum line voltage. The minimum input DC link voltage at 70% nominal output voltage are given as: @ min min 2 @ (1 ) 2( ) IN B ch DL B LINE DL L P D VV Cf − =⋅ − ⋅ (16) The minimum input DC link voltage at minimum output voltage are given as: @ min min 2 @ (1 ) 2( ) IN C ch DL C LINE DL L PD VV Cf − =⋅ − ⋅ (17) |
Similar Part No. - FAN103 |
|
Similar Description - FAN103 |
|
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.NET |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
