530402B00150G

更新时间： 2024-02-21 13:42:19

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爱美达 - AAVID		散热片
页数	文件大小	规格书
116页	8734K
描述
Channel style heat sink with folded back fins

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530402B00150G 数据手册

How To Select a Heat Sink

How to select a heat sink

The basic equation for heat transfer or power dissipation may be stated as follows:

Δ T

P =

ΣR

Where:

the power dissipated by the semiconductor device in watts.

D =

ΔT = the temperature difference of driving potential which causes the flow of heat.

ΣR = the sum of the thermal resistances of the heat flow path across which ΔT exists.

The above relationship may be stated in the following forms:

T –T

P =

θJC + θCS + θSA

θCS + θSA

θSA

Where:

T = the junction temperature in °C (maximum is usually stated by the manufacturer of the semiconductor device).

= case temperature of the semiconductor device in °C.

= temperature of the heat sink mounting surface in thermal contact with the semiconductor device in °C.

= ambient air temperature in °C.

= thermal resistance from junction to case of the semiconductor device in °C per watt

θJC

(usually stated by manufacturer of semiconductor device).

= thermal resistance through the interface between the semiconductor device

θCS

θSA

and the surface on which it is mounted in °C per watt.

= thermal resistance from mounting surface to ambient or thermal resistance of heat sink in °C per watt.

The above equations are generally used to determine the required thermal resistance of the heat sink (R

since the heat dissipation, maximum junction and/or case temperature, and ambient temperature are known or set.

θSA

The common practice is to represent the system with

Figure 1 indicates the location of the various heat

flow paths, temperatures and thermal resistances.

a network of resistances in series as shown in Figure 2.

FIGURE 1

FIGURE 2

Mounting surface

(cooler/dissipator)

Atmosphere

or ambient

Interface

Junction

(heat source)

Semiconductor case

θJC

θCS

θSA

θCS

θSA

Heat flow path mounting

surface to ambient, equation (3)

Heat flow path case

θJC

to ambient equation (2)

Heat flow path junction

to ambient, equation (1)

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