Moteur de recherche de fiches techniques de composants électroniques |
|
AN8049SH Fiches technique(PDF) 21 Page - Panasonic Semiconductor |
|
AN8049SH Fiches technique(HTML) 21 Page - Panasonic Semiconductor |
21 / 28 page Voltage Regulators AN8049SH 21 s Application Notes (continued) [6] Setting the maximum duty The maximum duty is set to 86% internally to the IC. However, this setting can be changed to be any value in the range 0% to 100% by adding an external resistor. 1. To use a duty lower than the current duty (80% to 92%) Insert the resistor RDT between the DT pin and ground. Determine the DT pin voltage for the required duty from the provided DT pin voltage vs. maximum on-duty characteristics in the "[2] Main characteristics" section and determine the value of the external resistor RDT from formula A. Note that there is a sample-to-sample variation of −19% to +33% due to temperature characteristics and sample- to-sample variations of the internal resistors R1 and R2. (However, the direction of the sample-to-sample varia- tions is identical for R1 and R2.) Determine the size of the sample-to-sample variations in the DT pin voltage VDT from formula B, and estimate the size of the sample-to-sample variation in the duty from the provided DT pin voltage vs. maximum on-duty characteristics in the "[2] Main characteristics" section . ··········A VDT = R2/RDT ×V REF ··········B R1+R2/RDT ch.1, 2 ch.3 R1 45 k Ω 44 kΩ R2 55 k Ω 56 kΩ 2. To use a duty higher than the current duty (80% to 92%) Insert the resistor RDT between the DT pin and the VREF pin. Use formulas C and D to determine the value of the external resistor RDT and the size of the sample-to-sample variations in the same manner as in item 1 above. ··········C VDT = R2 ×V REF ··········D R2+R1/RDT RDT = VDT VREF − ( 1 + 1 ) × V DT R1 R1 R2 RDT = VREF−VDT ( 1 + 1 ) × V DT − VREF R1 R2 R1 R1 R2 VREF 1.26 V DT RDT R1 R2 VREF 1.26 V DT RDT |
Numéro de pièce similaire - AN8049SH |
|
Description similaire - AN8049SH |
|
|
Lien URL |
Politique de confidentialité |
ALLDATASHEET.FR |
ALLDATASHEET vous a-t-il été utile ? [ DONATE ] |
À propos de Alldatasheet | Publicité | Contactez-nous | Politique de confidentialité | Echange de liens | Fabricants 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 |