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参数资料
| 型号： | CS5205-3GDPR3 |
| 元件分类： | 固定正电压单路输出LDO稳压器 |
| 英文描述： | 3.3 V FIXED POSITIVE LDO REGULATOR, 1.3 V DROPOUT, PSSO3 |
| 封装： | D2PAK-3 |
| 文件页数： | 6/7页 |
| 文件大小： | 160K |
| 代理商： | CS5205-3GDPR3 |
6
Applications Information: continued
The CS5205-X series of linear regulators includes thermal
shutdown and safe operating area circuitry to protect the
device. High power regulators such as these usually oper-
ate at high junction temperatures so it is important to cal-
culate the power dissipation and junction temperatures
accurately to ensure that an adequate heat sink is used.
The case is connected to VOUT on the CS5205-X, electrical
isolation may be required for some applications. Thermal
compound should always be used with high current regu-
lators such as these.
The thermal characteristics of an IC depend on the follow-
ing four factors:
1. Maximum Ambient Temperature TA (°C)
2. Power dissipation PD (Watts)
3. Maximum junction temperature TJ (°C)
4. Thermal resistance junction to ambient RΘJA (C/W)
These four are related by the equation
TJ = TA + PD × RΘJA
(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:
PD(max)={VIN(max)–VOUT(min)}IOUT(max)+VIN(max)IQ
(2)
where
VIN(max) is the maximum input voltage,
VOUT(min) is the minimum output voltage,
IOUT(max) is the maximum output current, for the application
IQ is the maximum quiescent current at IOUT(max).
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.
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 RΘJA, the total thermal resistance between the
junction and the surrounding air.
1. Thermal Resistance of the junction to case, RΘJC (°C/W)
2. Thermal Resistance of the case to Heat Sink, RΘCS (°C/W)
3. Thermal Resistance of the Heat Sink to the ambient air,
RΘSA (°C/W)
These are connected by the equation:
RΘJA = RΘJC + RΘCS + RΘSA
(3)
The value for RΘJA is calculated using equation (3) and the
result can be substituted in equation (1).
The value for RΘJC 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 CS5205-X the majority of
the heat is generated in the power transistor section. The
value for RΘSA depends on the heat sink type, while RΘCS
depends on factors such as package type, heat sink inter-
face (is an insulator and thermal grease used?), and the
contact area between the heat sink and the package. Once
these calculations are complete, the maximum permissible
value of RΘJA can be calculated and the proper heat sink
selected. For further discussion on heat sink selection, see
application note “Thermal Management for Linear
Regulators.”
Calculating Power Dissipation and Heat Sink Requirements
CS5205-1,-3,-5
相关PDF资料 |
PDF描述 |
|---|---|
| CS5205-3GDP3 | 3.3 V FIXED POSITIVE LDO REGULATOR, 1.3 V DROPOUT, PSSO3 |
| CS5205-3GT3 | 3.3 V FIXED POSITIVE LDO REGULATOR, 1.3 V DROPOUT, PSFM3 |
| CS5205-5GT3 | 5 V FIXED POSITIVE LDO REGULATOR, 1.3 V DROPOUT, PSFM3 |
| CS5208-1GT3 | 1.25 V-5 V ADJUSTABLE POSITIVE LDO REGULATOR, 1.3 V DROPOUT, PSFM3 |
| CS5411-4 | Optoelectronic |
相关代理商/技术参数 |
参数描述 |
|---|---|
| CS5205-3GT3 | 功能描述:IC REG LDO 3.3V 5A TO220AB RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:3,000 系列:- 稳压器拓扑结构:正，固定式和可调式 输出电压:3.3V，1.25 V ~ 5.7 V 输入电压:4.5 V ~ 7 V 电压 - 压降（标准）:1.1V @ 1A 稳压器数量:2 电流 - 输出:1A 电流 - 限制（最小）:1A 工作温度:0°C ~ 125°C 安装类型:表面贴装 封装/外壳:TO-252-5，DPak（4 引线 + 接片），TO-252AD 供应商设备封装:PPAK 包装:管件 其它名称:497-3576-5 |
| CS-5205-3T3 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Positive Fixed Voltage Regulator |
| CS5205-5 | 制造商:CHERRY 制造商全称:CHERRY 功能描述:5A Adjustable, and 3.3V and 5V Fixed Linear Regulators |
| CS5205-5GT3 | 功能描述:IC REG LDO 5V 5A TO220AB RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:3,000 系列:- 稳压器拓扑结构:正，固定式和可调式 输出电压:3.3V，1.25 V ~ 5.7 V 输入电压:4.5 V ~ 7 V 电压 - 压降（标准）:1.1V @ 1A 稳压器数量:2 电流 - 输出:1A 电流 - 限制（最小）:1A 工作温度:0°C ~ 125°C 安装类型:表面贴装 封装/外壳:TO-252-5，DPak（4 引线 + 接片），TO-252AD 供应商设备封装:PPAK 包装:管件 其它名称:497-3576-5 |
| CS-5205-5T3 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Positive Fixed Voltage Regulator |
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