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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  
Power Inputs  
put capacitor should have an ESR less than 1.  
Input power sequence are not required for VIN and  
VCNTL. However, do not apply a voltage to VOUT  
when there is not voltage VCNTL. This is due to the  
internal parasitic diodes between VOUT to VIN and  
VOUT to VCNTL which will be forward bias. The  
APL5331 can source few current or sinks current up  
to 3A for load when the input Voltage at VIN is not  
present.  
25  
20  
Stable Region  
15  
10  
5
0
10  
100  
1000  
µ
Capacitance( F)  
Reference Voltage  
A reference voltage is applied at the VREF pin by a  
resistor divider between VIN and GND pins. Normally Ultra-low-ESR capacitors, such as ceramic chip  
the bias current of the VREF pin flows out of the IC capacitors, may promote under-damped transient  
and is about 150nA(typ.), creating voltage offset at response, but proper ceramic chip capacitors placed  
the resistor divider and affecting the output voltage near loads can be used as decoupling capacitors. A  
accuracy. The recommended resistor is <5kto low-ESR solid tantalum and aluminum electrolytic ca-  
maintain the accuracy of the output voltage. An ex- pacitor (ESR<1) works extremely well and provides  
ternal bypass capacitor is also connected to VREF. good transient response and stability over temperature.  
The capacitor and the resistor divider form a low-  
pass filter to reduce the inherent reference noise from The output capacitors are also used to reduce the  
VIN. A ceramic capacitor can be use and is selected slew rate of load current and help the APL5331 to  
to be greater than 0.1µF. Connected the capacitor minimize variations of the output voltage, improving  
as close to VREF as possible for optimal effect. More transient response. For this purpose, the low-ESR  
capacitance and large resistor divider will increase capacitors are recommended and depend on the step-  
the soft-start interval. Do not place any additional load- ping and slew rate of load current.  
ing on this reference input pin.  
Input Capacitor  
Output Capacitor  
The input capacitors of VCNTL and VIN pins are not  
The APL5331 requires a proper output capacitor to required for stability but for supplying surge currents  
maintain stability over full temperature and current during large load transients, This will prevent the in-  
ranges, and improve transient response. The output put rail from drooping and improve the performance  
capacitor selection is dependent upon the ESR of the APL5331. Because of parasitic inductors from  
(equivalent series resistance) and capacitance of the voltage sources or other bulk capacitors to the VCNTL  
output capacitor over full temperature range. The fol- and VIN pins will limit the slew rate of the surge cur-  
lowing chart shows the stable region of the output rents during large load transients, resulting in voltage  
capacitor for APL5331. The stable region is above drop at VIN and VCNTL pins.  
the curve, indicating minimum required ESR and  
capacitance to maintain stability. However, the out  
Copyright ANPEC Electronics Corp.  
Rev. A.8 - Oct., 2003  
11  
www.anpec.com.tw