Datasheet > HEATSINK

HEATSINK

更新时间： 2024-02-20 03:55:26

品牌	Logo	应用领域
其他 - ETC		稳压器
页数	文件大小	规格书
7页	32K
描述
Heatsink Selection for Low-Dropout Regulators (29k)

阅读下载

中文翻译

获取价格

数据手册

如果您发现信息不准确，欢迎纠错

HEATSINK 数据手册

HEATSINK SELECTION FOR

LOW DROPOUT REGULATORS

AN96-2

March 9, 1998

TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com

Introduction

Detailed Calculations For

θ_s-a

A crucial part of the overall design in a system incorpo-

rating a linear regulator is dissipating the heat that is

generated in the regulator. This application note gives

advice on choosing a heatsink and suitable part num-

bers from leading manufacturers.

The required thermal impedance (sink-to-ambient) for

any application is defined by the following equation:-

T T

−

θ_{s − a}

− θ_{j − c}− θ_{c − s}

Selecting a Heatsink⁽¹⁾

1. On the chart for the device that you are planning to

use, cross reference the maximum current required and

the system’s maximum ambient temperature.⁽²⁾

Where:

= thermal impedance sink-to-ambient (°C/W)

θ_s-a

2. Read the required heatsink thermal impedance (sink-

to-ambient) off the chart. If your plotted point is between

two lines, use the lower thermal impedance value.

T_j= maximum junction temperature (°C)

(obtained from the device data sheet)

T_a= maximum ambient temperature (°C)

3. Look up your required thermal impedance value in

Table 1: Suggested Heatsink Selection, ensuring that

you use the column relevant to the air flow in your appli-

cation. If the air flow in your application is between two

of the values, then the lower flow rate column must be

used. From this table you can obtain suggested part

numbers for three different manufacturers.

= thermal impedance junction-to-case (°C/W)

(obtained from the device data sheet)

θ_j-c

= thermal impedance case-to-sink (°C/W)

(look up in your thermal management hardware

supplier’s data - for the TO-220 package, typi-

cally 1.25°C/W using silicone pads, and

0.5°C/W using thermal grease with no

insulation )

θ_c-s

Notes

1. These charts apply to heatsinking TO-220 regulators

converting from 5V to 3.3V only. Please refer to the

next column for information on how to calculate the

heatsink requirements for other applications.

= power dissipated in the device (W)

(where P = I_OUT(max)(V_IN(max)-V_OUT(min)) for worst

case calculation)

2. Note that if the device is mounted with no insulation,

the heatsink will be smaller, less hardware will be used,

and therefore the cost will be lower! Remember that in

this case, the heatsink will be at the same potential as

the output of the regulator. In cases with very high

power dissipation, using insulation may not be an op-

tion. In extreme cases, consider using one of Semtech’s

switching solutions, or the EZ1900 Load Balance Con-

troller to enable the use of two smaller heatsinks.

652 MITCHELL ROAD NEWBURY PARK CA 91320

12 3 4 5 6 7

中文翻译

下载PDF

与HEATSINK相关器件

型号	品牌	获取价格	描述	数据表
HEA-V01-CZ-17-001	TOKO	获取价格	Helix Antenna
HEA-V01-CZ-19-001	TOKO	获取价格	Helix Antenna
HEA-V01-CZ-27-001	TOKO	获取价格	Helix Antenna
HEA-V01-CZ-35-001	TOKO	获取价格	Helix Antenna
HEA-V01-CZ-37-001	TOKO	获取价格	Helix Antenna
HEA-V01-CZ-38-001	TOKO	获取价格	Helix Antenna
HEA-V01-CZ-45-001	TOKO	获取价格	Helix Antenna
HEA-V01-CZ-49-001	TOKO	获取价格	Helix Antenna
HEA-V02-CZ-15-001	TOKO	获取价格	Helix Antenna
HEA-V02-CZ-19-001	TOKO	获取价格	Helix Antenna

与HEATSINK相关文章

MBRS340T3G手册解读：参数说明、产品特性及应用
2024-06-28

1
PMOS管背靠背连接：串联还是并联？
2024-06-28

2
高压电解电容的分类与选型策略
2024-06-28

3
数码管：基本概念、分类、技术发展及市场趋势
2024-06-27

6

产品中心

服务支持

精选活动

关于我们

帮助中心

HEATSINK

HEATSINK 数据手册

与HEATSINK相关器件

与HEATSINK相关文章

您还可以找

产品中心

服务支持

精选活动

关于我们

帮助中心

HEATSINK

HEATSINK 数据手册

与HEATSINK相关器件

与HEATSINK相关文章

您还可以找

您在本页遇到什么问题？