APPNOTESMP9100 datasheet(1/2 Pages) ETC

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T

Heat Sink Temperature

R

Thermal Resistance - Heat Sink to

Ambient Air or Reference Temperature

T

Ambient or Reference Temperature

P

D

T Resistor Film Temperature (Max. 175

°C)

R

Thermal Resistance - Resistor Film

to Exposed Ceramic Case Interface

T

Case Temperature (Exposed Ceramic Surface)

R

Thermal Resistance - Case to Heat Sink

Surface (Pad or Thermal Grease)

Detail of

Cross Section

Center Line through Center

of Ceramic Element

Mounting Screw

Belleville Washer

Thermal Grease

or Pad

J

ØJC

C

ØCS

S

ØSA

A

Heat Sink

(mounting surface)

CAD

K

DOC

Applications Engineering Note: AEN-0102

Understanding the Power Rating

of Caddock MP9100 Resistors

Understanding the Power Rating

The maximum power rating of the Caddock MP9100

(TO-247 type) resistor is specified with the ceramic

surface maintained at 25

°C using the same method

established and proven by power semiconductor

manufacturers over many years.

Caddock’s careful design practices and thorough re-

liability testing assure the user that the part will per-

form to all published specifications as long as its case

temperature (T

C) does not exceed that specified in

Figure 1. Surge ratings must be observed.

In high power applications, the actual power dissipa-

tion capability of the resistor will be greatly depen-

dent on the heat sink, mounting method, interface ma-

terial characteristics and ambient temperature, (T

A). The

maximum continuous power rating (100 Watts) for the

Caddock MP9100 resistor is based on a case tem-

perature (T

C) of 25°C measured at the center of the

exposed ceramic surface. The Caddock MP9100 re-

sistor has a thermal resistance of 1.5

°C/watt (R

ØJC),

from the junction (resistor film) to the case (exposed

ceramic case interface). For a case temperature (T

C)

above 25

°C, derating is necessary.

Allowable power dissipation (P

D, watts) may be deter-

mined by the following equation.

Equation 1

P

D =

Using the information provided in Fig 2, allowable

power dissipation and temperature gradients can be

estimated. Typical thermal resistance of various ma-

terials can be found in Table 1 on the next page. It

should be noted that material characteristics are those

provided by the manufacturers and these can vary

greatly if careful manufacturing processes are not ob-

served. Caddock suggests that actual temperature

measurements should be made under worst case con-

ditions to assure maximum reliability of a design.

CAD

K

DOC

Figure 2 MP9100 with Mounting Screw

and Belleville Washer

Figure 1

A copy of this Application Note can be obtained at www.caddock.com

(R

ØJC + RØCS + RØSA)

T

J - TA

100 %

80 %

60 %

40 %

20 %

0

25

100

175

Case Temperature (T ,

°C)

g

C

MP9100 Derating Curve

Release Date: 9/20/02, Rev. A, Rev. Date: 9/20/02

Page 1 of 2

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