CM4 App Note 260424 issue 2.1.docx
Document No. 260424
Page 8 of 29
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.
CONVECTION PERFORMANCE
Natural Convection, No Heatsink, Free Air, Mounting Orientations A/B/C/D/E/F
CONVECTION PERFORMANCE WITH HEATSINK
(1)
Natural Convection, With Heatsink, Free Air, Mounting Orientations A/B/C/D/E/F
Orientation definitions
A
B
C
D
E
F
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.
0
50
100
150
200
250
300
350
400
450
500
550
-40
-30
-20
-10
0
10
20
30
40
50
60
70
80
Po
u
t
Ambient Temperature
S1 120Vin, 4x5Vout
A
B
CD
EF
0
50
100
150
200
250
300
350
400
450
500
550
-40
-30
-20
-10
0
10
20
30
40
50
60
70
80
Po
u
t
Ambient Temperature
S1 220Vin, 4x5Vout
A
B
CD
EF
0
50
100
150
200
250
300
350
400
450
500
550
600
650
-40
-30
-20
-10
0
10
20
30
40
50
60
70
80
Po
u
t
Ambient Temperature
S2/S3/S4 120Vin, 4x10/20/40Vout
A
B
CD
EF
0
50
100
150
200
250
300
350
400
450
500
550
600
650
-40
-30
-20
-10
0
10
20
30
40
50
60
70
80
Po
u
t
Ambient Temperature
S2/S3/S4 220Vin, 4x10/20/40Vout
A
B
CD
EF
0
50
100
150
200
250
300
350
400
450
500
550
-40
-30
-20
-10
0
10
20
30
40
50
60
70
80
Po
u
t
Ambient Temperature
S1 120Vin, 4x5Vout
A
B
CD
EF
0
50
100
150
200
250
300
350
400
450
500
550
-40
-30
-20
-10
0
10
20
30
40
50
60
70
80
Po
u
t
Ambient Temperature
S1 220Vin, 4x5Vout
A
B
CD
EF
0
50
100
150
200
250
300
350
400
450
500
550
600
650
-40
-30
-20
-10
0
10
20
30
40
50
60
70
80
Po
u
t
Ambient Temperature
S2/S3/S4 120Vin, 4x10/20/40Vout
A
B
CD
EF
0
50
100
150
200
250
300
350
400
450
500
550
600
650
-40
-30
-20
-10
0
10
20
30
40
50
60
70
80
Po
u
t
Ambient Temperature
S2/S3/S4 220Vin, 4x10/20/40Vout
A
B
CD
EF
