 |
Moteur de recherche de fiches techniques de composants électroniques |
|
|
Moteur de recherche de fiches techniques de composants électroniques |
|
TS5215 Fiches technique(PDF) 4 Page - Taiwan Semiconductor Company, Ltd |
|
||||||||||||||||||||||||||||||
TS5215 Fiches technique(HTML) 4 Page - Taiwan Semiconductor Company, Ltd |
|
|
4 / 7 page  TS5215 series 4-4 2006/01 rev. C Application Information Enable Input TS5215 series feature an active-high (>2V) 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 is compatible with CMOS logic interfacing. EN may be directly tied to Vin and pulled up to the maximum supply voltage. Input Capacitor Requirement An input capacitor of 1uF or greater is recommended when the device is more than 10” away from the bulk AC supply capacitance or when the supply is a battery. Reference Bypass Capacitor Bypass is connected to the internal voltage reference. A 470uF capacitor (Cbypass) connected from Bypass to Ground quiets this reference, providing a significant reduction in output noise. Cbypass reduces the regulator phase margin; when using Cbypass, output capacitors of 2.2uF or greater are generally required to maintain stability. The star up speed of the TS5215 is inversely proportional to the size of the reference bypass capacitor. Applications requiring a slow ramp up of output voltage should consider larger values of Cbypass. Likewise, if rapid turn on is necessary, consider omitting Cbypass. If output noise is not a major concern, omitted Cbypass and leave Bypass open. Output Capacitor Requirement The TS5215 series requires an output capacitor to maintain stability and improve transient response is necessary. The value of this capacitor is dependent upon whether a reference bypass capacitor is used. 1uF minimum is recommended when Cbypass is not used. 2.2uF minimum is recommended when Cbypass is 470uF. Larger values improve the regulator’s transient response. The output capacitor value may be increased without limit. The output capacitor should have an ESR (effective series resistance) less than 5Ω and a resonant frequency above 1MHz. Ultra low ESR capacitors can cause a low amplitude oscillation on the output and/or under damped transient response. Most of tantalum or aluminum electrolytic capacitors are adequate; film types will work. Since many aluminum electrolytic have electrolytes that freeze at about –30 oC, solid tantalums are recommended for operation below –25 oC. At lower values of output current, less output capacitance is required for output stability. The capacitor can be reduced to 0.47uF for current below 10mA or 0.33uF for currents below 1mA. No Load Stability The TS5215 series will remain stable and in regulation with no load, unlike many other voltage regulators. This is especially important in CMOS RAM keep alive applications. Adjustable Regulator Design The adjustable regulator versions can be adjusted to a specific output voltage by using two external resistors to programming the output voltage anywhere between 1.25 and the 8V maximum operating rating of the family. Two resistors are used. Resistors can be quite large up to 470kΩ, because of the very high input impedance and low bias current of the sense comparator, the resistor values are calculated by: Vout = 1.23V * (R2 / R1 + 1) A capacitor from Adj to Ground provides greatly improved noise performance. Dual Supply Operation When used in dual supply systems where the regulator load is returned to a negative supply, the output voltage must be diode clamped to ground. |
Numéro de pièce similaire - TS5215 |
|
Description similaire - TS5215 |
|
|
|
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 |
French ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
