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CS52015-3GDPR3 参数 Datasheet PDF下载

CS52015-3GDPR3图片预览
型号: CS52015-3GDPR3
PDF下载: 下载PDF文件 查看货源
内容描述: 1.5A , 3.3V固定线性稳压器 [1.5A, 3.3V Fixed Linear Regulator]
分类和应用: 线性稳压器IC调节器电源电路输出元件
文件页数/大小: 6 页 / 163 K
品牌: CHERRY [ CHERRY SEMICONDUCTOR CORPORATION ]
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Applications Information: continued  
IOUT(max) is the maximum output current, for the application  
Q is the maximum quiescent current at IOUT(max).  
conductor  
I
parasitic resistance  
R
C
A heat sink effectively increases the surface area of the  
package to improve the flow of heat away from the IC and  
into the surrounding air.  
VIN  
VOUT  
VIN  
CS52015-3  
RLOAD  
Each material in the heat flow path between the IC and the  
outside environment has a thermal resistance. Like series  
electrical resistances, these resistances are summed to  
determine RQJA, the total thermal resistance between the  
junction and the surrounding air.  
1. Thermal Resistance of the junction to case, RQJC (¡C/W)  
2. Thermal Resistance of the case to Heat Sink, RQCS (¡C/W)  
3. Thermal Resistance of the Heat Sink to the ambient air,  
Figure 2: Conductor parasitic resistance effects can be minimized with  
the above grounding scheme for fixed output regulators.  
RQSA (¡C/W)  
Calculating Power Dissipation and Heat Sink Requirements  
The CS52015-3 linear regulator includes thermal shutdown  
and current limit circuitry to protect the device. High  
power regulators such as these usually operate at high  
junction temperatures so it is important to calculate the  
power dissipation and junction temperatures accurately to  
ensure that an adequate heat sink is used.  
These are connected by the equation:  
QJA = RQJC + RQCS + RQSA  
R
(3)  
The value for RQJA is calculated using equation (3) and the  
result can be substituted in equation (1).  
The case is connected to VOUT on the CS52015-3, and elec-  
trical isolation may be required for some applications.  
Thermal compound should always be used with high cur-  
rent regulators such as these.  
The value for RQJC is 3.5ûC/W. For a high current regulator  
such as the CS52015-3 the majority of the heat is generated  
in the power transistor section. The value for RQSA  
depends on the heat sink type, while RQCS depends on fac-  
tors such as package type, heat sink interface (is an insula-  
tor and thermal grease used?), and the contact area  
The thermal characteristics of an IC depend on the follow-  
ing four factors:  
between the heat sink and the package. Once these calcula-  
tions are complete, the maximum permissible value of  
1. Maximum Ambient Temperature TA (¡C)  
2. Power dissipation PD (Watts)  
RQJA can be calculated and the proper heat sink selected.  
For further discussion on heat sink selection, see applica-  
tion note ÒThermal Management for Linear Regulators.Ó  
3. Maximum junction temperature TJ (¡C)  
4. Thermal resistance junction to ambient RQJA (C/W)  
These four are related by the equation  
TJ = TA + PD ´ RQJA  
(1)  
The maximum ambient temperature and the power dissi-  
pation are determined by the design while the maximum  
junction temperature and the thermal resistance depend on  
the manufacturer and the package type.  
The maximum power dissipation for a regulator is:  
P
D(max)={VIN(max)ÐVOUT(min)}IOUT(max)+VIN(max) Q  
I
(2)  
where  
VIN(max) is the maximum input voltage,  
VOUT(min) is the minimum output voltage,  
5