Moteur de recherche de fiches techniques de composants électroniques |
|
TS39304 Fiches technique(PDF) 6 Page - Taiwan Semiconductor Company, Ltd |
|
TS39304 Fiches technique(HTML) 6 Page - Taiwan Semiconductor Company, Ltd |
6 / 7 page TS39301/2/3/4 6-7 2005/12 rev. A Application Information (continues) Error Flag TS39301 versions feature an Error Flag, which looks at the output voltage and signals an error condition when this voltage drops 5% below its expected value. The error flag is an open-collector output that pulls low under fault conditions. It may sink 10mA. Low output voltage signifies a number of possible problems, including an over-current fault (the device is in current limit) or low input voltage. The flag output is inoperative during over temperature shutdown conditions. A pull-up resistor from error flag to either Vin or Vout is required for proper operation. For information regarding the minimum and maximum values of pull-up resistance, refer the graph as follow: When the error flag is not used, it is best to leave it open, the error flag pin can be tied directly to output Pin. Enable Input TS39301/2/3/4 versions feature an active-high enable (EN) input that allows ON/OFF control of the regulator. Current drain reduces to “zero” when the device is shutdown, with only micro-amperes of leakage current. The EN input has TTL/CMOS compatible thresholds for simple interfacing with logic interfacing. EN may be directly tied to Vin and pulled up to the maximum supply voltage. Transient Response and 3.3V to 2.5V or 2.5V to 1.8V Conversion TS39301/2/3/4 has excellent transient response to variations in input voltage and load current. The device have been designed to respond quickly to load current variations and input voltage variations. Large output capacitors are not required to obtain this performance. A standard 47uF output capacitor, preferably tantalum, is all that is required. Larger values help to improve performance even further. By virtue of its low dropout voltage, this device does not saturate into dropout as readily as similar NPN base designs. When converting from 3.3V to 2.5V or 2.5V to 1.8V, the NPN based regulators are already operating in dropout, with typical dropout requirements of 1.2V or greater,. To convert down to 2.5V or 1.8V without operating in dropout, NPN based regulators require an input voltage of 3.7V at the very least. The TS39300 series regulator will provide excellent performance with an input as low as 3.0V or 2.5V respectively. This gives the PNP based regulators a distinct advantage over older, NPN based linear regulators. Power Dissipation Determine the power dissipation requirements for the design along with the maximum ambient temperature at which the device will be operated. Pd = (Vin- Vout) * Iout + Vin * Ignd The heat sink thermal resistance is determined by: Өsa = [Tj(max) – Ta] / Pd – (Өjc + Өcs) When Tj(max) < 125 oC, and Өcs is between 0 oC and 2 oC/W, the heat sink may be significantly reduced in applications where the input voltage is known and large compare with the dropout voltage. Output Sense Sense pin can be connect to the load and traces the load voltage, TS39303/4 will adjust the output voltage to maintain the load at expected voltage. |
Numéro de pièce similaire - TS39304 |
|
Description similaire - TS39304 |
|
|
Lien URL |
Politique de confidentialité |
ALLDATASHEET.FR |
ALLDATASHEET vous a-t-il été utile ? [ DONATE ] |
À propos de Alldatasheet | Publicité | Contactez-nous | Politique de confidentialité | Echange de liens | Fabricants 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 |