 |
поискавой системы для электроныых деталей |
|
|
поискавой системы для электроныых деталей |
|
A7986ATR датащи(PDF) 35 Page - STMicroelectronics |
|
|
|||||||||||||||||||||||||||||
A7986ATR датащи(HTML) 35 Page - STMicroelectronics |
|
|
35 / 42 page  DocID022801 Rev 5 35/42 A7986A Application ideas Equation 40 where ISW is the average current in the embedded power MOSFET in the ON time. To chose the right value of the inductor and to manage transient output current, which for a short time can exceed the maximum output current calculated by Equation 40, also the peak current in the power MOSFET must be calculated. The peak current, shown in Equation 41, must be lower than the minimum current limit (3.7 A). Equation 41 where r is defined as the ratio between the inductor current ripple and the inductor DC current: So, in the buck-boost topology the maximum output current depends on the application conditions (firstly input and output voltage, secondly switching frequency and inductor value). In Figure 35, the maximum output current for the above configuration is depicted varying the input voltage from 4.5 V to 38 V. The dashed line considers a more accurate estimation of the duty cycles given by Equation 42, where power losses across diodes, external power MOSFET, and internal power MOSFET are taken into account. Figure 35. Maximum output current according to max. DC switch current (3.0 A): VO=12 V I SW I OUT 1D – ------------- 2 A < = I SW ,PK I OUT 1D – ------------- 1 r 2 --- + 3.7A < ⋅ = r V OUT I OUT LF SW ⋅⋅ ------------------------------------ 1D – () 2 ⋅ = |
|
ссылки URL |
| Вашему бизинису помогли Аллдатащит? [ DONATE ] |
Что такое Аллдатащит | реклама | контакт | Конфиденциальность | Ссылка на техническое описание | обмен ссыками | поиск по производителю 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 |
Russian ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
