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| 型号： | CS5203A-5GT3 |
| 厂商： | ON Semiconductor |
| 文件页数： | 7/10页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 5V 3A TO220AB |
| 产品变化通告： | Product Obsolescence 01/Apr/2004 |
| 标准包装： | 50 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 5V |
| 输入电压： | 最高 17V |
| 电压 - 压降（标准）： | 1.05V @ 3A |
| 稳压器数量： | 1 |
| 电流 - 输出： | 3A |
| 电流 - 限制（最小）： | 3.2A |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 通孔 |
| 封装/外壳： | TO-220-3 |
| 供应商设备封装： | TO-220AB |
| 包装： | 管件 |
| 其它名称： | CS5203A-5GT3OS |
CS5203A?1, CS5203A?2, CS5203A?3, CS5203A?5
Calculating Power Dissipation and Heatsink
Requirements
The CS5203A series of linear regulators 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 Heatsink is used.
The case is connected to V OUT on the CS5203A, electrical
isolation may be required for some applications. Thermal
compound should always be used with high current
regulators such as these.
The thermal characteristics of an IC depend on the
following four factors:
A Heatsink effectively increases the surface area of the
package to improve the flow of heat away from the IC and
into the surrounding air.
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 R q JA , the total thermal resistance between the
junction and the surrounding air.
1. Thermal Resistance of the junction?to?case, R q JC
( ° C/W)
2. Thermal Resistance of the case to Heatsink, R q CS
( ° C/W)
3. Thermal Resistance of the Heatsink to the ambient
air, R q SA ( ° C/W)
R q JA + R q JC ) R q CS ) R q SA
1.
2.
3.
4.
Maximum Ambient Temperature T A ( ° C)
Power dissipation P D (Watts)
Maximum junction temperature T J ( ° C)
Thermal resistance junction to ambient R q JA ( ° C/W)
These four are related by the equation
These are connected by the equation:
(3)
The value for R q JA is calculated using equation (3) and the
result can be substituted in equation (1).
TJ + TA ) PD
R q JA
(1)
The value for R q JC is normally quoted as a single figure
for a given package type based on an average die size. For
a high current regulator such as the CS5203A the majority
The maximum ambient temperature and the power
dissipation 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:
PD(max) + {VIN(max) * VOUT(min)}IOUT(max) ) VIN(max)IQ
(2)
where:
V IN(max) is the maximum input voltage,
V OUT(min) is the minimum output voltage,
of the heat is generated in the power transistor section. The
value for R q SA depends on the Heatsink type, while R q CS
depends on factors such as package type, Heatsink interface
(is an insulator and thermal grease used?), and the contact
area between the Heatsink and the package. Once these
calculations are complete, the maximum permissible value
of R q JA can be calculated and the proper Heatsink selected.
For further discussion on Heatsink selection, see application
note “Thermal Management,” document number
AND8036/D, available through the Literature Distribution
Center or via our website at http://onsemi.com.
I OUT(max) is the maximum output current, for the
application
I Q is the maximum quiescent current at I OUT(max) .
http://onsemi.com
7
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相关代理商/技术参数 |
参数描述 |
|---|---|
| CS-5203A-5T3 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Positive Fixed Voltage Regulator |
| CS5203A-HGZ | 功能描述:差分放大器 High temp ceramic Geophone amp RoHS:否 制造商:Texas Instruments 通道数量:1 Channel 带宽:2.4 GHz 可用增益调整:6 dB to 26 dB 输入补偿电压: 共模抑制比（最小值）:- 40 dB 工作电源电压:4.75 V to 5.25 V 电源电流:100 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:WQFN-24 封装:Reel |
| CS5204-1 | 制造商:The Cherry Corporation 功能描述: |
| CS5204-1/D | 制造商:未知厂家 制造商全称:未知厂家 功能描述:4A Adjustable， and 3.3V and 5V Fixed Linear Regulators |
| CS5204-1_06 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:4.0 A Adjustable, and 3.3 V and 5.0 V Fixed Linear Regulators |
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