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AS2954AT5-5.0

更新时间： 2024-01-25 04:21:25
品牌 Logo 应用领域
西伯斯 - SIPEX 输出元件调节器
页数 文件大小 规格书
6页 182K
描述
Fixed/Adjustable Positive LDO Regulator, 1.24V Min, 29V Max, 0.6V Dropout, PSSO5, TO-263, 5 PIN

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AS2954AT5-5.0 技术参数

是否Rohs认证： 不符合生命周期：Transferred
Reach Compliance Code：unknown风险等级：5.67
Is Samacsys：N可调性：FIXED
标称回动电压 1：0.38 V最大绝对输入电压：60 V
JESD-609代码：e0最大电网调整率：0.01%
最大负载调整率：0.01%输出次数：1
端子数量：5工作温度TJ-Max：125 °C
工作温度TJ-Min：-40 °C最大输出电流 1：0.25 A
标称输出电压 1：5 V封装主体材料：PLASTIC/EPOXY
封装等效代码：SMSIP5H,.6,67TB认证状态：Not Qualified
子类别：Other Regulators表面贴装：YES
技术：BIPOLAR端子面层：Tin/Lead (Sn/Pb)
端子节距：1.7 mm端子位置：SINGLE
最大电压容差：1.5%Base Number Matches：1

AS2954AT5-5.0 数据手册

 浏览型号AS2954AT5-5.0的Datasheet PDF文件第1页浏览型号AS2954AT5-5.0的Datasheet PDF文件第2页浏览型号AS2954AT5-5.0的Datasheet PDF文件第3页浏览型号AS2954AT5-5.0的Datasheet PDF文件第4页浏览型号AS2954AT5-5.0的Datasheet PDF文件第6页 
AS2954  
Also, it may be programmed for any output voltage between its  
1.235V reference and its 30V maximum rating. As seen in  
Figure 2, an external pair of resistors is required.  
Refer to the below equation for the programming of the output  
voltage:  
REDUCING OUTPUT NOISE  
It may be an advantage to reduce the AC noise present at the output.  
One way is to reduce the regulator bandwidth by increasing the size of  
the output capacitor. This is the only way that noise can be reduced  
on the 3 lead AS2954 but is relatively inefficient, as increasing the  
capacitor from 1µF to 220µF only decreases the noise from 430µV to  
160µV rms for a 100kHz bandwidth at 5V output.  
V
OUT = VREF × ( 1 + R1\ R2 )+ IFBR1  
Noise could also be reduced fourfold by a bypass capacitor across R1,  
since it reduces the high frequency gain from 4 to unity. Pick  
The VREF is 1.235 and IFB is the feedback bias current, nominally  
-20nA. The minimum recommended load current of 1µA forces  
an upper limit of 1.2 MΩ on value of R2. If no load is presented  
the IFB produces an error of typically 2% in VOUT, which may be  
eliminated at room temperature by trimming R1. To improve the  
accuracy choose the value of R2 = 100k this reduces the error by  
0.17% and increases the resistor program current by 12µA. Since  
the LP2951 typically draws 60µA at no load with Pin 2 open-  
circuited this is a small price to pay  
C
BYPASS ≅ 1 / 2πR1 × 200 Hz  
or choose 0.01µF. When doing this, the output capacitor must be  
increased to 3.3µF to maintain stability. These changes reduce the  
output noise from 430µV to 100µVRMS for a 100kHz bandwidth at 5V  
output. With the bypass capacitor added, noise no longer scales with  
output voltage so that improvements are more dramatic at higher  
output voltages.  
HEATSINK REQUIREMENTS  
Depending on the maximum ambient temperature and maximum  
power dissipation a heatsink may be required with the AS2954.  
The junction temperature range has to be within the range  
specified under Absolute Maximum Ratings under all possible  
operating conditions. To find out if a heatsink is required, the  
maximum power dissipation of the device needs to be calculated.  
This is the maximum specific AC voltage that must be taken into  
consideration at input. Figure 3 shows the condition and power  
dissipation which should be calculated with the following  
formula:  
IIN  
5V  
IN  
VIN  
OUT  
IL  
P
TOTAL = (VIN - 5) IL + (VIN)IG  
AS2954  
LOAD  
Next step is to calculate the temperature rise TR (MAX). TJ (MAX  
)
+
+
maximum allowable junction temperature, TA  
ambient temperature :  
(MAX) maximum  
2.2 uF  
GND  
TR (MAX) = TJ (MAX) - TA (MAX  
)
IG  
IIN= IL+ IG  
Junction to ambient thermal resistance θ(j-A) can be calculated  
after determining of PTOTAL & TR (MAX):  
Figure 3. 5V Regulator Circuit  
θ(J-A) = TR (max)/P(MAX)  
If the θ(J-A) is 60°C/W or higher, the device could be operated  
without a heatsink. If the value is below 60°C/W then the  
heatsink is required and the thermal resistance of the heatsink can  
be calculated by the following formula, θ(J-C) junction to case,  
θ(C-H) case to heatsink, θ(H-A) heatsink to ambient:  
θ(J-A) = θ(J-C) + θ(C-H) + θ(H-A)  
Rev.9/29/00  
123456

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