поискавой системы для электроныых деталей |
|
LM2926T датащи(PDF) 5 Page - National Semiconductor (TI) |
|
|
LM2926T датащи(HTML) 5 Page - National Semiconductor (TI) |
5 / 10 page Typical Performance Characteristics (Continued) Typical Circuit Waveforms Applications Information EXTERNAL CAPACITORS The LM2926/7 output capacitor is required for stability. With- out it, the regulator output will oscillate at amplitudes as high as several volts peak-to-peak at frequencies up to 500 kHz. Although 10 µF is the minimum recommended value, the ac- tual size and type may vary depending upon the application load and temperature range. Capacitor equivalent series re- sistance (ESR) also affects stability. The region of stable op- eration is shown in the Typical Performance Characteris- tics (Output Capacitor ESR curve). Output capacitors can be increased in size to any desired value above 10 µF. One possible purpose of this would be to maintain the output voltage during brief conditions of input transients that might be characteristic of a particular system. Capacitors must also be rated at all ambient temperatures expected in the system. Many aluminum electrolytics freeze at temperatures below −30˚C, reducing their effective ca- pacitance to zero. To maintain regulator stability down to −40˚C, capacitors rated at that temperature (such as tantal- ums) must be used. DELAYED RESET The delayed reset output is designed to hold a microproces- sor in a reset state on system power-up for a programmable time interval to allow the system clock and other powered cir- cuitry to stabilize. A full reset interval is also generated when- ever the output voltage falls out of regulation. The circuit is tripped whenever the output voltage of the regulator is out of regulation by the Reset Threshold value. This can be caused by low input voltages, over current conditions, over-voltage shutdown, thermal shutdown, and by both power-up and power-down sequences. When the reset circuit detects one of these conditions, the delay capacitor is discharged by an SCR and held in a discharged state by a saturated NPN switch. As long as the delay capacitor is held low, the reset output is also held low. Because of the action of the SCR, the reset output cannot glitch on noise or transient fault condi- tions. A full reset pulse is obtained for any fault condition that trips the reset circuit. When the output regains regulation, the SCR is switched off and a small current (I DELAY = 2 µA) begins charging the de- Reset Delay DS010759-29 Reset Delay DS010759-30 DS010759-5 5 www.national.com |
Аналогичный номер детали - LM2926T |
|
Аналогичное описание - LM2926T |
|
|
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 |