 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
APL5331U5C-TRL Datasheet(PDF) 10 Page - Anpec Electronics Coropration |
|
||||||||||||||||||||||||||||||
APL5331U5C-TRL Datasheet(HTML) 10 Page - Anpec Electronics Coropration |
|
|
10 / 20 page  Copyright ANPEC Electronics Corp. Rev. A.8 - Oct., 2003 APL5331 www.anpec.com.tw 10 Application Information General The APL5331 is a linear regulator and is capable of sourcing or sinking current up to 3A. The APL5331 has fast transient response, accurate output voltage (small voltage offset, load regulation), active-low shut- down control and fault protections (current-limit, ther- mal shutdown). The APL5331 is available in several packages to meet different of power dissipation in requirement various applications. Output Voltage Regulation The output voltage at VOUT pin tracks the reference voltage applied at VREF pin. Two internal NPN pass transistors controlled by separate high bandwidth er- ror amplifiers regulate the output voltage by sourcing current from VIN pin or sinking current to GND pin. The base currents of the pass transistors are pro- vided by VCNTL pin. An internal kelvin sensing scheme use at the VOUT pin for perfect load regula- tion at various load current. To prevent the two pass transistors from shoot-through, a small voltage offset is created between the positive inputs of the two error amplifiers. This results in higher output voltage while the regulator sinks light or heavy load current. Since the APL5331 exhibits very fast load transient response, lesser amount of capacitors can be use. In addition, capacitors with high ESR can also be use. Shutdown and Soft-Start The VREF pin is a dual-function input pin, acting as reference input and shutdown control input. Apply- ing and holding a voltage below 0.35V(typ.) to VREF pin shuts down the output of the regulator. An NPN transistor or N-channel MOSFET is used to pull down the VREF while applying a “high” signal to turn on the transistor. When shutdown function is active, the two pass transistors are turned off and the imped- ance of the VOUT is about 10M Ω (typ.), sourcing or sinking no current. When release the VREF pin, the current through the resistor divider charges the soft- start capacitor to initiate a soft-start cycle. The output voltage tracks the rising VREF. The soft start process limits the input surge current. Thermal Shutdown An thermal shutdown circuit limits the junction tem- perature of the APL5331. When the junction tem- perature exceeds TJ= +150oC, a thermal sensor turns off both pass transistors, allowing the device to cool down. The regulator starts to regulate again after the junction temperature reduces by 40oC, resulting in a pulsed output during continuous thermal overload conditions. The thermal limit designed with a 40oC hysteresis lowers the average TJ during continuous thermal overload conditions, extend life time of APL5331. Current Limit The APL5331 monitors sourcing and sinking current, and limits the maximum output current to prevent dam- ages during overload or short-circuit, To increase the input voltage of VIN or VCNTL will get higher current-limit points. |
Similar Part No. - APL5331U5C-TRL |
|
Similar Description - APL5331U5C-TRL |
|
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.COM |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List 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 |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
