 |
поискавой системы для электроныых деталей |
|
|
поискавой системы для электроныых деталей |
|
AN2689 датащи(PDF) 14 Page - STMicroelectronics |
|
|
|||||||||||||||||||||||||||||
AN2689 датащи(HTML) 14 Page - STMicroelectronics |
|
|
14 / 42 page  Data line protection AN2689 14/42 Doc ID 14310 Rev 3 Vbr is the breakdown voltage measured @1 mA. This corresponds to the beginning of the action of the Transil. Vcl is the clamping voltage Vcl 45 V. Its value depends on the current that flows through the device. The relationship between this parameter and the current is given by: Where: ● Rd is the dynamic resistance of the Transil. ● Ipp is the current imposed by the surge generator. ● Irm is the leakage current measured @Vrm. ● Vf is the direct voltage drop measured at current If depending on the application. 3.3 Design calculation example Whatever the protection device package choice, the final choice will be directly linked to the power dissipation demanded by the surge. Power is: with The important missing parameter to solve these equations is the dynamic resistance Rd, which depends on the current value imposed by the surge. 3.3.1 Determination of Rd Rd is the dynamic resistance of the Transil. It is dependent on the current surge rate and duration. Rd is calculated by: Where Vcl is the dynamic clamping voltage measured at Ipp for exponential surge duration. For example, considering an SM6T27AY device (Figure 18), we can determine the Rd for a pulse duration tp = 1 ms thanks to the 10/1000 µs parameters of Table 2: Figure 18. SM6T27AY package Ipp Rd Vbr Vcl * + = Ipp Vcl Ppp * = Ipp Rd Vbr Vcl * + = Ipp Vbr Vcl Rd max - = K A Unidirectional |
|
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
