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5. Power Ratings
CM4 series products must always be operated within stated operating limits. Equipment manufacturers and other users must take the appropriate
de-rating into account when specifying a unit for the intended application. If in doubt, contact TDK-Lambda for assistance.
There are three main de-ratings for the CM4 series of configurable power supplies when used in a conduction cooled application,
1. Ambient air temperature
Ambient air temperature de-ratings apply to the input
module rated and peak power only.
The input module must be de-rated by 2.5% per
degree Celsius above 50°C, up to a maximum of
70°C.
2. Baseplate temperature
Baseplate temperature de-ratings apply to output
module rated power, peak power and rated current,
and bias supply power.
The output module parameters must be de-rated by
2.5% per degree Celsius above 85°C, up to a
maximum of 105°C.
3. Input line voltage
Input line voltage de-ratings apply to the rated power
and peak power for both the input module and output
(3)
module.
All parameters must be de-rated by 2.5% for every 3
volts below 120Vrms, down to a minimum of 85Vrms.
Notes:
1.
Ambient air temperature is the air temperature immediately surrounding the power supply.
2.
Baseplate temperature is measured at baseplate temperature sensing location TS1 (see mechanical drawings for location.
3.
A normalized value of 1 is equivalent to 100%.
4.
Input line voltage de-ratings are cumulative with temperature de-ratings.
Examples of power ratings calculation for various input voltages, ambient temperatures and baseplate temperatures
V
(V
)
IN
RMS
Normalised V
Rating [A]
IN
T
(⁰C)
AMBIENT
Normalised T
Rating [B]
AMBIENT
T
(⁰C)
BASE
Normalised T
Rating [C]
BASE
Normalised Total input rating [A*B = D]
Normalised Total output rating [A*C = E]
Input module P
[600W/750W*D]
RATED/PEAK
Bias supply power [5W*C]
S1 P
[125W/187.5W*E]
RATED/PEAK
S1 I
[25A*C]
RATED
S2 P
[150W/225W*E]
RATED/PEAK
S2 I
[15A*C]
RATED
S3 P
[150W/225W*E]
RATED/PEAK
S3 I
[7.5A*C]
RATED
S4 P
[150W/217.5W*E]
RATED/PEAK
S4 I
[3.75A*C]
RATED
CM4 App Note 260424 issue 2.1.docx
(1)
(3)
(2)
1
2
120
85
1
0.708
70
50
0.5
1
85
85
1
1
0.5
0.708
1
0.708
300/375
424.8/531
5
5
125/187.5
88.5/132.75
25
25
150/225
106.2/159.3
15
15
150/225
106.2/159.3
7.5
7.5
150/217.5
106.2/154
3.75
3.75
Document No. 260424
Ambient Temperature Derating
1.1
1
0.9
0.8
0.7
Derate at 2.5% per degree Celsius
above 50 degree Celsius
0.6
0.5
0.4
-40
-30
-20
-10
Ambient Temperature (Celsius)
Temperature Derating
1.1
1
0.9
0.8
0.7
Derate at 2.5% per degree Celsius
0.6
above 85 degree Celsius
0.5
0.4
-40 -30 -20 -10
0
10
Baseplate Temperature (Celsius)
Input Line voltage Derating
1.1
1
0.9
0.8
0.7
0.6
0.5
0.4
80
100
120
140
3
4
85
120
0.708
1
70
50
0.5
1
85
95
1
0.75
0.354
1
0.708
0.75
212.4/265.5
600/750
5
3.75
88.5/132.75
93.75/140.625
25
18.75
106.2/159.3
112.5/168.75
15
11.25
106.2/159.3
112.5/168.75
7.5
5.625
106.2/154
112.5/163.125
3.75
2.8125
0
10
20
30
40
50
60
20
30
40
50
60
70
80
90 100 110
Derate at 2.5% per every
3 volts below 120Vrms
160
180
200
220
240
260
Input Voltage (RMS)
5
6
120
100
1
0.833
60
60
0.75
0.75
105
95
0.5
0.75
0.75
0.624
0.5
0.624
450/562.5
374.4/468
2.5
3.75
62.5/93.75
78/117
12.5
18.75
75/112.5
93.6/140.4
7.5
11.25
75/112.5
93.6/140.4
3.75
5.625
75/108.75
93.6/135.72
1.875
2.8125
Page 7 of 29
70
280
7
120
1
50
1
105
0.5
1
0.5
600/750
2.5
62.5/93.75
12.5
75/112.5
7.5
75/112.5
3.75
75/108.75
1.875
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