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System Cooling - TDK-Lambda CM4 Application Notes

Ac/dc modular power supply series
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6. System Cooling

The power ratings shown in the previous section are for conduction cooling, however the unit may be operated with forced air cooling, convection
cooling or combinations of all three. To assist in specifying the product for these applications, the typical thermal performance has been
characterised under controlled conditions. The ratings achieved are based on maintaining the baseplate temperature within the conduction
cooled ratings specified in section 5.
Natural Convection, No Heatsink, Free Air, Mounting Orientations A/B/C/D/E/F
550
500
450
400
350
300
250
S1 120Vin, 4x5Vout
200
150
100
50
A
B
0
-40
-30
-20
-10
0
650
600
550
500
450
400
350
300
250
S2/S3/S4 120Vin, 4x10/20/40Vout
200
150
100
50
A
B
0
-40
-30
-20
-10
0
Natural Convection, With Heatsink, Free Air, Mounting Orientations A/B/C/D/E/F
550
500
450
400
350
300
250
S1 120Vin, 4x5Vout
200
150
100
50
A
B
0
-40
-30
-20
-10
0
650
600
550
500
450
400
350
300
250
S2/S3/S4 120Vin, 4x10/20/40Vout
200
150
100
50
A
B
0
-40
-30
-20
-10
0
A
Orientation
definitions
Notes
1.
Standard TDK-Lambda heatsinks type 1 and type 2 used. Type 1 used for mounting orientations A, B, E and F. Type 2 used for mounting orientations A, B, C and D.
CM4 App Note 260424 issue 2.1.docx
CONVECTION PERFORMANCE
CD
EF
10
20
30
40
50
60
Ambient Temperature
CD
EF
10
20
30
40
50
60
Ambient Temperature
CONVECTION PERFORMANCE WITH HEATSINK
CD
EF
10
20
30
40
50
60
Ambient Temperature
CD
EF
10
20
30
40
50
60
Ambient Temperature
Orientation definitions
B
C
550
500
450
400
350
300
250
S1 220Vin, 4x5Vout
200
150
100
50
A
0
70
80
-40
-30
-20
650
600
550
500
450
400
350
300
250
S2/S3/S4 220Vin, 4x10/20/40Vout
200
150
100
50
A
0
70
80
-40
-30
-20
550
500
450
400
350
300
250
S1 220Vin, 4x5Vout
200
150
100
50
A
0
70
80
-40
-30
-20
650
600
550
500
450
400
350
300
250
S2/S3/S4 220Vin, 4x10/20/40Vout
200
150
100
50
A
0
70
80
-40
-30
-20
D
Document No. 260424
B
CD
EF
-10
0
10
20
30
40
Ambient Temperature
B
CD
EF
-10
0
10
20
30
40
Ambient Temperature
(1)
B
CD
EF
-10
0
10
20
30
40
Ambient Temperature
B
CD
EF
-10
0
10
20
30
40
Ambient Temperature
E
50
60
70
80
50
60
70
80
50
60
70
80
50
60
70
80
F
Page 8 of 29

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