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APL5331G5C-TRL 参数 Datasheet PDF下载

APL5331G5C-TRL图片预览
型号: APL5331G5C-TRL
PDF下载: 下载PDF文件 查看货源
内容描述: 3A总线终端稳压器 [3A Bus Termination Regulator]
分类和应用: 稳压器
文件页数/大小: 20 页 / 231 K
品牌: ANPEC [ ANPEC ELECTRONICS COROPRATION ]
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APL5331  
Application Information  
General  
Shutdown and Soft-Start  
The APL5331 is a linear regulator and is capable of The VREF pin is a dual-function input pin, acting as  
sourcing or sinking current up to 3A. The APL5331 reference input and shutdown control input. Apply-  
has fast transient response, accurate output voltage ing and holding a voltage below 0.35V(typ.) to VREF  
(small voltage offset, load regulation), active-low shut- pin shuts down the output of the regulator. An NPN  
down control and fault protections (current-limit, ther- transistor or N-channel MOSFET is used to pull down  
mal shutdown). The APL5331 is available in several the VREF while applying a “high” signal to turn on the  
packages to meet different of power dissipation in transistor. When shutdown function is active, the  
requirement various applications.  
two pass transistors are turned off and the imped-  
ance of the VOUT is about 10M(typ.), sourcing or  
sinking no current. When release the VREF pin, the  
Output Voltage Regulation  
The output voltage at VOUT pin tracks the reference current through the resistor divider charges the soft-  
voltage applied at VREF pin. Two internal NPN pass start capacitor to initiate a soft-start cycle. The output  
transistors controlled by separate high bandwidth er- voltage tracks the rising VREF. The soft start process  
ror amplifiers regulate the output voltage by sourcing limits the input surge current.  
current from VIN pin or sinking current to GND pin.  
The base currents of the pass transistors are pro-  
Thermal Shutdown  
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.  
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.  
Copyright ANPEC Electronics Corp.  
Rev. A.8 - Oct., 2003  
10  
www.anpec.com.tw