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ACE1085272WM+ Datasheet(Fiches technique) 5 Page - ACE Technology Co., LTD.

Numéro de pièce ACE1085272WM+
Description  3A Low Dropout Linear Regulator
Télécharger  11 Pages
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Fabricant  ACE [ACE Technology Co., LTD.]
Site Internet  http://www.ace-ele.com
Logo ACE - ACE Technology Co., LTD.

ACE1085272WM+ Datasheet(HTML) 5 Page - ACE Technology Co., LTD.

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ACE1085
                        Technology
3A Low Dropout Linear Regulator
VER 1.2
5
ACE1085
Typical application of ACE1085
Application Hints
1. Recommend using 10uF tan capacitor as bypass capacitor for all application circuit.
2. Recommend using 22uF tan capacitor to assure circuit stability.
3. Using a bypass capacitor(CAdj) between the adjust terminal and ground can improve ripple rejection,
This bypass capacitor prevents ripple from being amplified as the output voltage is increased. The
impedance of CAdj should be less than the resistor’s(R1) which is between output and adjust pins to
prevent ripple from being amplified at any ripple frequency. As R1 is normally in the range of
120Ω~200Ω,the value of CAdj should satisfy this equation: 2*Fripple*CAdj<R1. Recommend using 10uF
tan capacitor.
Output Voltage of Adjustable Version
The ACE1085 adjustable version provide 1.25V Reference Voltage. Any output voltage between
1.25V~13.8V can be available by choosing two external resistors (connection method is shown in chart 1).
In chart 1, R1,R2 is the two external resistors.
Explanation
The output voltage of adjustable version satisfies this followed equation:
Vout=VRef*(1+R2/R1)+IAdj*R2. We can ignore IAdj because IAdj(about 50uA) is much less than the
current of R1(about 4mA).
How to choose R1:The value of R1 should be in the range of 120Ω~200Ω to assure chip working
normally without any load. To assure the electrical performance showed in table 1, the output current
should be larger than 5mA. If R1 is too large, the minimum output current should be larger than 4mA , The
best working condition is to assure that the output current exceeds 10mA.


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