 |
поискавой системы для электроныых деталей |
|
|
поискавой системы для электроныых деталей |
|
LTC1421 датащи(PDF) 27 Page - Linear Technology |
|
|
|||||||||||||||||||||||||||||
LTC1421 датащи(HTML) 27 Page - Linear Technology |
|
|
27 / 40 page  LTC4211 27 4211fb APPLICATIONS INFORMATION + VCC SENSE LTC4211 8 2 34 76 CLOAD VOUT 12V 3A GND 4211 F17 5 1 R4 12.4k GATE GND TIMER PCB CONNECTION SENSE CTIMER 8.2nF FB ON SHORT LONG VCC 12V GND LONG Z1 = 1SMA12A OR SMAJ12A ** HIGHLY RECOMMENDED RESET R2 10k R1 61.9k RX 10Ω RSENSE 0.012Ω PCB EDGE CONNECTOR (MALE) M1 Si4410DY Z1** RG 100Ω R3 93.1k R5 10k μP LOGIC RESET CX 100nF BACKPLANE CONNECTOR (FEMALE) 12V Hot Swap Application Figure 17 shows a 12V, 3A Hot Swap application circuit. The resistor divider R1/R2 programs the undervoltage lockout externally and allows the system to start up after VCC increases above 9.46V. The resistor divider R3/R4 monitors VOUT and signals the RESET pin when VOUT goes above 10.54V. Transient voltage suppressor Z1 and snubber network (CX, RX) are highly recommended to protect the 12V applications system from ringing and voltage spikes. RG is recommended for VCC > 10V and it can minimize high frequency parasitic oscillations in the power MOSFET. AUTORETRY AFTER A FAULT To configure the LTC4211 to automatically retry after a fault condition, the FAULT and ON pins can be connected to a pull-up resistor (RAUTO) to the supply, as shown in Figure 17. 12V Hot Swap Application Figure 18. In this case, the autoretry circuitry will attempt to restart the LTC4211 with a 50% duty cycle, as shown in the timing diagram of Figure 19. To prevent overheat- ing the external MOSFET and other components during the autoretry sequence, adding a capacitor (CAUTO) to the circuit introduces an RC time constant (tOFF) that adjusts the autoretry duty cycle. Equation 14 gives the autoretry duty cycle, modified by this external time constant: Autoretry Duty Cycle ≈ tTIMER tOFF + 2• tTIMER •100% (14) where tTIMER = LTC4211 system timing(see TIMER func- tion) and tOFF is a time needed to charge capacitor CAUTO from 0V to the ON pin threshold (1.316V). In Figure 18 with RAUTO = 1M, the external RC time constant is set at 1 second, the tTIMER delay equals 6.2ms and the autoretry duty cycle drops from 50% to 2.5%. Figure 18. LTC4211MS Autoretry Application FAULT VCC LTC4211MS SENSE GATE FB 1 2 3 4 5 10 RSENSE 0.007Ω Q1 Si4410DY 9 8 7 6 RESET ON FILTER TIMER CTIMER 10nF GND CFILTER 100pF RAUTO (SEE NOTE) RPULL-UP 10k CAUTO 1μF R3 10Ω Z1* NOTE: Q1 MOUNTED TO 300mm2 COPPER AREA RAUTO = 1M YIELDS 2.5% DUTY CYCLE AND Q1 TCASE = 50°C RAUTO = 3.2M YIELDS 0.8% DUTY CYCLE AND Q1 TCASE = 37°C Z1 = 1SMA10A OR SMAJ10A * OPTIONAL 4211 F18 C1 0.1μF R1 36k VOUT 5V 5A CLOAD R2 15k + LONG VCC 5V GND RESET LONG PCB EDGE CONNECTOR (MALE) BACKPLANE CONNECTOR (FEMALE) SHORT |
|
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
