Thermal performance information, Design guide & applications manual, Page 28 of 88 – Vicor Micro Family of DC-DC Converter User Manual
Page 29
Design Guide & Applications Manual
For Maxi, Mini, Micro Family DC-DC Converters and Configurable Power Supplies
Maxi, Mini, Micro Design Guide
Rev 4.9
vicorpower.com
Page 28 of 88
Apps. Eng. 800 927.9474
800 735.6200
6. Thermal Performance Information
2V Micro Thermal Performance Curves - No Heat Sink
0
5
10
15
20
25
30
35
40
45
50
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
10
0
Ambient Temperature (deg C)
O
u
tp
u
t
P
o
w
e
r
(W
a
tt
s
)
2V Micro Thermal Performance Curves - .4" Heat Sink
0
5
10
15
20
25
30
35
40
45
50
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
10
0
Ambient Temperature (deg C)
O
u
tp
u
t
P
o
w
e
r
(W
a
tt
s
)
2V Micro Thermal Performance Curves - .9" Heat Sink
0
5
10
15
20
25
30
35
40
45
50
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
10
0
Ambient Temperature (deg C)
O
u
tp
u
t
P
o
w
e
r
(W
a
tt
s
)
3.3V Micro Thermal Performance Curves - No Heat Sink
0
10
20
30
40
50
60
70
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
10
0
Ambient Temperature (deg C)
O
u
tp
u
t
P
o
w
e
r
(W
a
tt
s
)
3.3V Micro Thermal Performance Curves - .4" Heat Sink
0
10
20
30
40
50
60
70
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
10
0
Ambient Temperature (deg C)
O
u
tp
u
t
P
o
w
e
r
(W
a
tt
s
)
3.3V Micro Thermal Performance Curves - .9 Heat Sink
0
10
20
30
40
50
60
70
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
10
0
Ambient Temperature (deg C)
O
u
tp
u
t
P
o
w
e
r
(W
a
tt
s
)
5V Micro Thermal Performance Curves - No Heat Sink
0
10
20
30
40
50
60
70
80
90
100
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
10
0
Ambient Temperature (deg C)
O
u
tp
u
t
P
o
w
e
r
(W
a
tt
s
)
5V Micro Thermal Performance Curves - .4" Heat Sink
0
10
20
30
40
50
60
70
80
90
100
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
10
0
Ambient Temperature (deg C)
O
u
tp
u
t
P
o
w
e
r
(W
a
tt
s
)
5V Micro Thermal Performance Curves - .9" Heat Sink
0
10
20
30
40
50
60
70
80
90
100
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
10
0
Ambient Temperature (deg C)
O
u
tp
u
t
P
o
w
e
r
(W
a
tt
s
)
12 - 48V Micro Thermal Performance Curves - No Heat Sink
0
20
40
60
80
100
120
140
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
10
0
Ambient Temperature (deg C)
O
u
tp
u
t
P
o
w
e
r
(W
a
tt
s
)
12 - 48V Micro Thermal Performance Curves - .4" Heat Sink
0
20
40
60
80
100
120
140
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
10
0
Ambient Temperature (deg C)
O
u
tp
u
t
P
o
w
e
r
(W
a
tt
s
)
12 - 48V Micro Thermal Performance Curves - .9" Heat Sink
0
20
40
60
80
100
120
140
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
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85
90
95
10
0
Ambient Temperature (deg C)
O
u
tp
u
t
P
o
w
e
r
(W
a
tt
s
)
Baseplate (No Heat Sink)
0.4'' (10,1 mm) Heat Sink
0.9'' (22,8 mm) Heat Sink
2 V
3.3 V
5 V
12 – 54 V
θ
bs
= 0.21°C/W
Baseplate
0.9'' Longitudinal Fins
0.9'' Transverse Fins
0.4'' Longitudinal Fins
0.4'' Transverse Fins
Free Air
10.90
5.37
5.04
7.77
7.76
200 LFM
6.90
2.51
2.31
3.87
3.58
400 LFM
4.78
1.79
1.68
2.68
2.52
600 LFM
3.74
1.42
1.31
2.13
2.01
800 LFM
3.15
1.20
1.10
1.78
1.67
1,000 LFM
2.79
1.06
0.97
1.48
1.45
1,200 LFM
2.49
0.93
0.88
1.32
1.29
Free Air
200 LFM
400 LFM
600 LFM
800 LFM
1000 LFM
1200 LFM
Micro Output Power vs. Ambient Temperature Derating Curves
Micro θ
ba
(Baseplate-to-Ambient Thermal Resistance Values) vs. Airflow
THERMAL PERFORMANCE CURVES (Micro)
Table Usage: The forced convection thermal impedance data shown in the tables on the next three pages assumes airflow through the heat
sink fins. Actual airflow through the fins should be verified. For purposes of heat sink calculation, assume efficiencies listed on Micro data
sheets. Use as a design guide only. Verify final design by actual temperature measurement.