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VRD50NLX Datasheet(PDF) 10 Page - List of Unclassifed Manufacturers

Part # VRD50NLX
Description  CMOS
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Manufacturer  ETC2 [List of Unclassifed Manufacturers]
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VRD50NLX Datasheet(HTML) 10 Page - List of Unclassifed Manufacturers

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AnaSem Inc.
9
Rev. C09-08
VRD 系列
高速度
, 低压差, ±1% 高输出精度 CMOS双路稳压器
.......... Future of the analog world
工作原理解说
一般运作
请参考以下
VRD系列的电压控制电路图;
运用电路图内的
Error Amplifier,参考电压(VREF)能与VFEEDBACK作比较,而参数电压侧由回输电阻R1
R2除开。这样电压供应到输出的三极管(请参考注*1)来保持稳定的电压输出避免其他从电压输入因负极
回输电路而产生的不稳定影响。
*1)
EN端 (稳压器电路运作开关功能) 和 CL自动放电功能
VRD
系列能以EN端来作关闭动作。此时,当在EN端的信号成关闭水平时,内置的P-极三极管是在
OFF
的状态,所有稳压器的内部电路运作会被停止来节省电流功耗。在关闭的模式时,VRH系列能自
动放电阻抗(RDIS ; 160_)来把存留在CL 的电荷放出,如此VOUT端的电压能迅速地回到VSS的水平。
输出端电容(CL)
于相位补偿的功能,输出端电容(CL)需要尽量靠近地连接与VOUT端与VSS端。 建议的电容为最少是
1.0μF
值的陶瓷式电容。当然,电容值是基于个别不一的应用方式。此外,为了保持稳定的电源供应,
建议采用一颗最少为1.0μF的输入端电容(CIN)接于VIN端与VSS端之间。
过量电流限制和短路保护
VRD
系列以内置的电流限制电路来达成过量电流保护的功用。当负载电流达到限制的电流水平,输出电
压会下降,同时间输出电流也会相应地减低。在输出端短路的情况下一般的电流值为40mA。
VIN
VSS
+
_
VOUT
Voltage
Reference
Over-current
Protector
EN
VREF
Error Amp.
R2
R1
VFEEDBACK
*1)
VRD系列以内置有连接着P-沟道三极管为输出三极管。为了避免VRD系列稳压器因反向电流从VOUT
端经过寄生二极管通至
VIN端而损坏,VOUT值应设至不高于VIN+0.3V.
RDIS


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