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VCN60/70 Series
High Ef?ciency, High Current Density, 60 or 70 Amp
Single Inline Package DC/DC Converters
Thermal Derating Curves for the 70 Amp rated VCN70BADJTU-1C
80
Maximum Current Thermal Derating, V OUT = 1.2V
65
Maximum Current Thermal Derating, V OUT = 2.5V*
75
70
Air?ow
200 LFM
300 LFM
400 LFM
60
55
Air?ow
200 LFM
300 LFM
400 LFM
500 LFM
500 LFM
65
25
30
35
40
45
50
55
60
65
50
25
30
35
40
45
50
55
60
65
80
Ambient Temperature (oC)
Maximum Current Thermal Derating, V OUT = 1.5V
50
Ambient Temperature (oC)
Maximum Current Thermal Derating, V OUT = 3.3V*
75
70
65
Air?ow
200 LFM
300 LFM
400 LFM
500 LFM
45
40
Air?ow
200 LFM
300 LFM
400 LFM
500 LFM
60
35
25
30
35
40 45 50 55
60
65
25
30
35
40
45
50
55
60
65
Ambient Temperature (oC)
Ambient Temperature (oC)
Note:
For the 3.3V model, the maximum output current
at 3.3V is 45A due to input current limitations.
Maximum Current Thermal Derating, V OUT = 1.8V
80
75
70
Air?ow
200 LFM
300 LFM
400 LFM
The table shows the appropriate derated output current for running the unit at
70°C ambient temberature and respective air?ows.
VCN70BADJTU-1C DERATED OUTPUT CURRENT (AMPS) AT 70°C AMBIENT
65
500 LFM
300LFM
1.2V
59.6
1.5V
57.6
1.8V
57.0
2.5V*
53.6
3.3V*
45.0
60
400LFM
63.6
62.1
61.1
57.6
45.0
25
30
35
40
45
50
55
60
65
Ambient Temperature (oC)
500LFM
67.9
65.6
64.6
61.6
45.0
* IOutput loads in excess of ~140W are possible at higher V OUT settings (>2V), if proper Thermal Derating is maintained, and if V IN is high enough to limit input current to below 15A in
the 20A rated on board input fuse.
www.murata-ps.com/support
MDC_VCN60/70 Series.B09 Page 4 of 7
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