CW025ACL-M Lineage Power, CW025ACL-M Datasheet - Page 14

• Manufacturer Part Number: CW025ACL-M
• Description: CONV DC/DC +5/+-15V 25W OUT
• Manufacturer: Lineage Power
• Series: CW025r
• Type: Isolated with Remote On/Offr

Specifications of CW025ACL-M

• Output: 5V, ±15V
• Number Of Outputs: 3
• Power (watts): 25W
• Mounting Type: Through Hole
• Voltage - Input: 36 ~ 75V
• Package / Case: 10-DIP Module
• 1st Output: 5 VDC @ 5A
• 2nd Output: 15 VDC @ 830mA
• 3rd Output: -15 VDC @ 830mA
• Size / Dimension: 2.80" L x 2.40" W x 0.50" H (71.1mm x 61mm x 12.7mm)
• Power (watts) - Rated: 25W
• Operating Temperature: -40°C ~ 100°C
• Efficiency: 83%
• Approvals: CE, CSA, UL, VDE
• Product: Isolated
• Output Power: 25 W
• Input Voltage Range: 36 V to 75 V
• Output Voltage (channel 1): 5 V
• Output Current (channel 1): 5 A
• Output Voltage (channel 2): 15 V
• Output Current (channel 2): 0.83 A
• Output Voltage (channel 3): - 15 V
• Output Current (channel 3): 0.83 A
• Isolation Voltage: 500 V
• Package / Case Size: DIP
• Output Type: Isolated
• Output Voltage: 5 V
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• 4th Output: -
• Lead Free Status / Rohs Status: No

CW025 Triple-Output-Series Power Modules:
36 Vdc to 75 Vdc Input; 25 W
Thermal Considerations
Basic Thermal Performance
The maximum operating temperature of the CW025 Tri-
ple-Output-Series Power Modules at a given operating
condition can be predicted by combining the power dis-
sipation curves (Figures 23 through 27), the power der-
ating curve (Figure 28), and the thermal resistance
curve (Figure 29).
Use Figures 23 through 28 and the steps below to pre-
dict the safe operating region for many different operat-
ing and environmental conditions.
1.
2.
3.
4.
5.
6.
For example, consider the CW025ABK-M power
module operating with 54 V input and output currents
I
The total output power (P
power dissipation is P
by adding:
14
14
O1
= 2.5 A, I
Calculate the total output power.
Use P
or 24) to determine the fixed losses (P
ated with operating at P
independent of which output the load is being
drawn from.
Use the desired output current (I
Figure 25 to determine P
tional power being dissipated due to loading of
the main output.
Repeat Step 3 for outputs 2 and 3 using the
appropriate figure (Figure 26 or 27) to determine
P
loading of the auxiliary outputs.
Find the total power dissipated (P
ing the four power dissipations obtained in Steps
2 through 4.
Use the estimated total power dissipated (P
along with Figure 28 to determine the maximum
ambient temperature allowable for a given air
velocity.
S2
P
P
P
P
P
P
O
and P
D
S1
S2
S3
P
total = (I
total = P
O
O2
total with the appropriate figure (Figure 23
= 4.4 W (from Figure 23)
= 0.22 W (from Figure 25)
= 0.06 W (from Figure 26)
= 0.06 W (from Figure 26)
S3
= 0.5 A, I
, which is the power dissipated due to
O1
P
+ P
x V
D
total = 4.74 W, which is obtained
O1
S1
O3
O
) + (I
total) is 24.5 W. The total
+ P
= 0.5 A.
O
total. These losses are
S1
S2
O2
, which is the addi-
+ P
x V
(continued)
S3
O2
O1
D
) + (I
) with
total) by add-
P
O3
) associ-
x V
D
total)
O3
)
Figure 28 shows that, in natural convection, the maxi-
mum ambient temperature that this module can oper-
ate at is approximately 67 °C.
Keep in mind that the procedure above provides
approximations of the temperature and air velocities
required to keep the case temperature below its maxi-
mum rating. The maximum case temperature, as moni-
tored at the point shown in Figure 22, should be
maintained at 100 °C or less under all conditions.
Air Velocity
The air velocity required to maintain a desired maxi-
mum case temperature for a given power dissipation
and ambient temperature can be calculated using
Figure 28 and the following equation:
where:
For example, to maintain a maximum case temperature
of 85 °C with an ambient inlet temperature of 65 °C and
a power dissipation of 4.74 W, the thermal resistance is:
This corresponds to an airflow greater than 0.36 ms
(70 fpm) in Figure 28.
air (°C/W).
T
(°C).
T
P
(W) at the desired operating condition.
CA
A
C,
D
total is the total power dissipated by the module
is the ambient inlet temperature (°C).
max
is the thermal resistance from case-to-ambient
is the desired maximum case temperature
CA
85 C 65 C
-------------------------------------
CA
4.74 W
=
–
T
------------------------------ -
C
P
max
D
total
=
–
T
4.2
A
°C/W
Data Sheet
April 2008
Lineage Power
–1