поискавой системы для электроныых деталей |
|
UC27133DG4 датащи(PDF) 7 Page - Texas Instruments |
|
|
UC27133DG4 датащи(HTML) 7 Page - Texas Instruments |
7 / 13 page 7 UC17131/2/3 UC27131/2/3 UC37131/2/3 Choosing The CDEL Capacitor The maximum amount of time that VCC power can be in- terrupted and not require the outputs to go through a turn-on delay cycle is user programmable by the CDEL capacitor value. While VCC is interrupted, the outputs will be in an indeterminate state and they may turn off during this interval, tINT. However, as long as the pro- grammed interruption time is not exceeded, the outputs will immediately turn back on with the return of VCC. For example: ts INT ≈ 500µ (User specified) CDEL is selected such that the time it takes for this ca- pacitor to discharge from VCDEL_MAX (5.8V) to VFAULT_L (1.3V) with a discharge current of 94 µA is just greater than this tINT. This time is referred to as tD(OFF) in Fig. 3b. () CDEL It VV DISCHARGE D OFF CDEL MAX FAULT L = • − __ If tD(OFF) is set equal to tINT, which the user has selected to be 500 µs, the minimum CDEL capacitor is calculated: CDEL As VV = • − 94 500 58 13 µµ .. For this application, the CDEL capacitor value calculates to 10.4nF. By using a 10nF capacitor on CDEL, VCC can be interrupted for up to 478 µs and the outputs will experi- ence an indeterminate state during this interruption, but resume normal operation when VCC power returns to normal. If the VCC power is interrupted for a time equal to or lon- ger than tD(OFF) then the following relationships apply. As the CDEL capacitor discharges past the VFAULT_L threshold, the output is fully disabled and must cycle through a power up delay equal to tD(ON). The charge current for the CDEL capacitor is equal to 4 µA. The out- puts will turn on when the CDEL capacitor charges up to the VFAULT_H threshold of 4.9V. The minimum turn-on delay the outputs will experience will occur if tINT is ex- actly equal to the tD(OFF) time and the CDEL capacitor has only discharged to VFAULT_L. This would be the mini- mum turn-on delay time and is calculated with the follow- ing equation: () t CDEL V V I DON FAULT L FAULT H CHARGE min __ = •− Using the 10nF CDEL capacitor, for example, the mini- mum turn-on delay calculates to 9ms. If the CDEL ca- pacitor discharges completely to zero, then the 10nF CDEL capacitor would cause a turn-on delay of 12.25ms. The outputs would be off for this amount of time after VCC power is restored. The total amount of time the out- puts could be disabled is equal to the tINT time, which may include the indeterminate time of tD(OFF), and the tD(ON) time, as shown in Fig. 3b. APPLICATION INFORMATION C CDEL 13 12 11 VREF IN 6 10 3 7 VCC LS CSH 2 GND 6V PRE-REGULATOR INPUT COMPARATOR 1/2 VREF HYST 9 LED TURN-ON/OFF AND SHORT CIRCUIT PROTECTION CDEL 4 HS 5 Q OUT VREF GND 72V R CSH –L CSL +L OUT C CC LOAD I GND R HYST POWER SUPPLY C REF I CC Figure 2a. High side application. UDG-98027 |
Аналогичный номер детали - UC27133DG4 |
|
Аналогичное описание - UC27133DG4 |
|
|
ссылки URL |
Конфиденциальность |
ALLDATASHEETRU.COM |
Вашему бизинису помогли Аллдатащит? [ DONATE ] |
Что такое Аллдатащит | реклама | контакт | Конфиденциальность | 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 |