Electronic Components Datasheet Search |
|
TK65020 Datasheet(PDF) 10 Page - TOKO, Inc |
|
TK65020 Datasheet(HTML) 10 Page - TOKO, Inc |
10 / 14 page ADVANCED INFORMATION Page 10 January 1999 TOKO, Inc. TK65020 HIGHER-ORDER DESIGN EQUATION The equation above was developed as a closed form approximation. In order to allow a closed form approximation, the design variable that required the least approximation was “I OUT,” as opposed to “L”. The approximations made in the equation development have the primary consequence that error is introduced as resistive losses become relatively large. As it is normally a practical design goal to ensure that resistive losses will be relatively small, this seems acceptable. The variables used are: I OUT Output current capability I OUT(TGT) Targeted output current capability V OUT Output voltage V F Diode forward voltage V BB Battery voltage, unloaded D Oscillating duty ratio of main switch f Oscillator frequency L Inductance value R S Source resistance (battery + filter) R L Inductor winding resistance R SW Switch on-state resistance R OF Output filter resistance R U ESR of upstream output capacitor C S Snubber capacitance Deriving a design solution with this equation is necessarily an iterative process. Use worst-case tolerances as described for inductor selection, using different values for “L” to approximately achieve an “I OUT” equal to the targeted value. Then, fine tune the parasitic values as needed and, if necessary, readjust “L” again and reiterate the process. SINGLE-CELL APPLICATION (CONT.) ƒC S [VBB 2+ (V OUT+ VF) 2 + (V OUT + VF - VBB) 2 ] 2(V OUT + VF) I OUT = V OUT + ROFIOUT(TGT) + (V BBRU) + VF - VBB 1 - (R S+ RL) 2ƒ L D ( 2ƒ L D ) 2ƒ L D [ ) ( 2ƒ L D 1- (R S + RL + RSW) ] 2 - V BB 2 D |
Similar Part No. - TK65020 |
|
Similar Description - TK65020 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | 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 |