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AS2810AM3-3.0 PDF预览

AS2810AM3-3.0

更新时间： 2024-02-22 01:27:31
品牌 Logo 应用领域
其他 - ETC 模拟IC
页数 文件大小 规格书
7页 154K
描述
Analog IC

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AS2810AM3-3.0 技术参数

是否Rohs认证：不符合生命周期：Obsolete
包装说明：SOT-223, 3 PINReach Compliance Code：unknown
风险等级：5.74Is Samacsys：N
最大回动电压 1：1.2 V最大输入电压：10 V
最小输入电压：4.5 VJESD-30 代码：R-PDSO-G4
长度：6.5024 mm湿度敏感等级：1
功能数量：1端子数量：4
工作温度TJ-Max：125 °C工作温度TJ-Min：-40 °C
最大输出电流 1：1 A最大输出电压 1：3.06 V
最小输出电压 1：2.94 V标称输出电压 1：3 V
封装主体材料：PLASTIC/EPOXY封装代码：LSOP
封装形状：RECTANGULAR封装形式：SMALL OUTLINE, LOW PROFILE
峰值回流温度（摄氏度）：225认证状态：Not Qualified
调节器类型：FIXED POSITIVE SINGLE OUTPUT LDO REGULATOR座面最大高度：1.7 mm
表面贴装：YES端子形式：GULL WING
端子节距：2.3 mm端子位置：DUAL
处于峰值回流温度下的最长时间：NOT SPECIFIED宽度：3.505 mm
Base Number Matches：1

AS2810AM3-3.0 数据手册

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AS2810  
APPLICATION HINTS  
Reducing parasitic resistance and inductance  
One solution to minimize parasitic resistance and inductance is  
to connect in parallel capacitors. This arrangement will  
improve the transient response of the power supply if your  
system requires rapidly changing current load condition.  
The AS2810 incorporates protection against over-current  
faults, reversed load insertion, over temperature operation, and  
positive and negative transient voltage. However, the use of  
an output capacitor is required in order to improve the stability  
and the performances.  
Thermal Consideration  
Stability  
Although the AS2810 offers some limiting circuitry for  
overload conditions, it is necessary not to exceed the  
maximum junction temperature, and therefore to be careful  
about thermal resistance. The heat flow will follow the lowest  
resistance path, which is the Junction-to-case thermal  
resistance. In order to insure the best thermal flow of the  
component, a proper mounting is required. Note that the case  
of the device is electrically connected to the output. In case  
the case has to be electrically isolated, a thermally conductive  
spacer can be used. However do not forget to consider its  
contribution to thermal resistance.  
The output capacitor is part of the regulator’s frequency  
compensation system. Either a 22µF aluminum electrolytic  
capacitor or a 10µF solid tantalum capacitor between the  
output terminal and ground guarantees stable operation for all  
operating conditions.  
However, in order to minimize overshoot and undershoot, and  
therefore optimize the design, please refer to the section  
‘Ripple Rejection’.  
Ripple Rejection  
Assuming:  
Ripple rejection can be improved by adding a capacitor  
between the ADJ pin and ground as shown in figure 6. When  
ADJ pin bypassing is used, the value of the output capacitor  
required increases to its maximum (22µF for an aluminum  
electrolytic capacitor, or 10µF for a solid tantalum capacitor).  
If the ADJ pin is not bypass, the value of the output capacitor  
can be lowered to 10µF for an electrolytic aluminum capacitor  
or 4.7µF for a solid tantalum capacitor.  
V
IN = 10V, VOUT = 5V, IOUT = 1.5A, TA = 50°C/W,  
θ Heatsink Case= 6°C/W, θ Heatsink Case = 0.5°C/W, θ JC = 3°C/W  
Power dissipation under this condition  
PD = (VIN – VOUT) * IOUT = 7.5W  
Junction Temperature  
TJ = TA + PD * (θ Case - HS+ θ HS + θ JC  
)
However the value of the ADJ-bypass capacitor should be  
chosen with respect to the following equation:  
For the Control Sections  
C = 1 / ( 6.28 * FR * R1 )  
TJ = 50 + 7.5*(0.5+6=3) = 121.25°C  
121.25°C < TJ (max) for the Control & Power Sections.  
Where C  
= value of the capacitor in Farads (select an  
equal or larger standard value),  
FR = ripple frequency in Hz,  
R1 = value of resistor R1 in Ohms.  
In both case reliable operation is insured by adequate junction  
temperature.  
If an ADJ-bypass capacitor is use, the amplitude of the output  
ripple will be independent of the output voltage. If an ADJ-  
bypass capacitor is not used, the output ripple will be  
proportional to the ratio of the output voltage to the reference  
voltage:  
M = VOUT / VREF  
Where M = multiplier for the ripple seen when the ADJ pin  
is optimally bypassed.  
V
REF = Reference Voltage  
Rev. 10/2/00  
1234567

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