MR750RLG データシートの表示（PDF） - ON Semiconductor

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MR750RLG

High Current Lead Mounted Rectifiers

ON Semiconductor 

MR750 SERIES

28

L = 1/8"

24

1/4"

20

16

3/8"

RESISTIVE INDUCTIVE

LOADS

BOTH LEADS TO HEAT

SINK WITH LENGTHS

AS SHOWN

12

5/8"

8.0

4.0

0

0 20 40 60 80 100 120 140 160 180 200

TL, LEAD TEMPERATURE (°C)

Figure 5. Maximum Current Ratings

32

CAPACITANCE LOADS

28

I(pk) = 5 Iavg

24

10 Iavg

20

20 Iavg

16

6F

1F & 3F

12

8.0

RESISTIVE − INDUCTIVE LOADS

4.0

0

0 4.0 8.0 12 16 20 24 28 32

IF(AV), AVERAGE FORWARD CURRENT (AMPS)

Figure 7. Power Dissipation

40

35

SINGLE LEAD TO HEAT SINK,

INSIGNIFICANT HEAT FLOW

30 THROUGH OTHER LEAD

25

20

15

10

BOTH LEADS TO HEAT

5.0

SINK, EQUAL LENGTH

0

0 1/8 1/4 3/8 1/2 5/8 3/4 7/8 1.0

L, LEAD LENGTH (INCHES)

Figure 8. Steady State Thermal Resistance

7.0

6.0

5.0

4.0

3.0

2.0

1.0

0

0

RqJA = 25°C/W

SEE NOTE

RESISTIVE INDUCTIVE LOADS

CAPACITANCE LOADS − 1F & 3F

I(pk) = 5 Iavg

I(pk) = 10 Iavg

I(pk) = 20 Iavg

RqJA = 40°C/W

SEE NOTE

f = 60 Hz

6F (IPK/IAVE = 6.28)

20 40 60 80 100 120 140 160 180 200

TA, AMBIENT TEMPERATURE (°C)

Figure 6. Maximum Current Ratings

NOTES

THERMAL CIRCUIT MODEL

(For Heat Conduction Through The Leads)

RqS(A)

RqL(A)

RqJ(A)

TA(A)

TL(A)

TC(A)

TJ

RqJ(K)

RqL(K)

RqS(K)

PF

TC(K)

TA(K)

TL(K)

Use of the above model permits junction to lead thermal resistance for

any mounting configuration to be found. Lowest values occur when one

side of the rectifier is brought as close as possible to the heat sink as

shown below. Terms in the model signify:

TA = Ambient Temperature

TC = Case Temperature

TL = Lead Temperature

TJ = Junction Temperature

RqS = Thermal Resistance, Heat Sink to Ambient

RqL = Thermal Resistance, Lead to Heat Sink

RqJ = Thermal Resistance, Junction to Case

PF = Power Dissipation

(Subscripts A and K refer to anode and cathode sides, respectively.)

Values for thermal resistance components are:

RqL = 40°C/W/in. Typically and 44°C/W/in Maximum.

RqJ = 2°C/W typically and 4°C/W Maximum.

Since RqJ is so low, measurements of the case temperature, TC, will be

approximately equal to junction temperature in practical lead mounted

applications. When used as a 60 Hz rectifierm the slow thermal response

holds TJ(PK) close to TJ(AVG). Therefore maximum lead temperature may

be found from: TL = 175°−RqJL PF. PF may be found from Figure 7.

The recommended method of mounting to a P.C. board is shown on the

sketch, where RqJA is approximately 25°C/W for a 1−1/2" x 1−1/2" copper

surface area. Values of 40°C/W are typical for mounting to terminal strips

or P.C. boards where available surface area is small.

ÉÉÉÉÉÉÉÉÉÉÉÉ Board Ground Plane

ÉÉÉÉRecommended mounting for half wave circuit

http://onsemi.com

4

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