DC025ACL-M Lineage Power, DC025ACL-M Datasheet - Page 14

• Manufacturer Part Number: DC025ACL-M
• Description: CONV DC/DC +5/+-15V 25W OUT
• Manufacturer: Lineage Power
• Series: DC025r
• Type: Isolatedr

Specifications of DC025ACL-M

• Output: 5V, ±15V
• Number Of Outputs: 3
• Power (watts): 25W
• Mounting Type: Through Hole
• Voltage - Input: 18 ~ 36V
• Package / Case: 9-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: 82%
• Approvals: CSA, UL, VDE
• Product: Isolated
• Output Power: 25 W
• Input Voltage Range: 18 V to 36 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

18 Vdc to 36 Vdc Input; 25 W
Thermal Considerations
Basic Thermal Performance
The maximum operating temperature of the DC025 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 28).
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. Calculate the total output power.
2. Use P
3. Use the desired output current (I
4. Repeat Step 3 for outputs 2 and 3 using the appro-
5. Find the total power dissipated (P
6. Use the estimated total power dissipated (P
For example, consider the DC025ABK power module
operating with 27 V input and output currents
I
The total output power (P
power dissipation is P
by adding:
14
14
O1
= 2.5 A, I
or 25) to determine the fixed losses (P
ated with operating at P
independent of which output the load is being
drawn from.
to determine P
being dissipated due to loading of the main output.
priate figure (Figure 23 or 27) to determine P
P
the auxiliary outputs.
the four power dissipations obtained in Steps 2
through 4.
along with Figure 28 to determine the maximum
ambient temperature allowable for a given air
velocity.
P
P
P
P
S3
P
S1
S2
S3
, which is the power dissipated due to loading of
P
P
= 4.5 W (from Figure 23)
= 0.22 W (from Figure 25)
= 0.07 W (from Figure 23)
= 0.07 W (from Figure 23)
O
D
O
total = (I
total = P
total with the appropriate figure (Figure 23
O2
= 0.5 A, I
S1
O1
P
, which is the additional power
+ P
D
x V
total = 4.86 W, which is obtained
O3
S1
O1
O
total) is 24.5 W. The total
) + (I
+ P
= 0.5 A.
O
total. These losses are
S2
O2
+ P
(continued)
x V
O1
S3
O2
D
) with Figure 25
total) by adding
) + (I
P
) associ-
O3
x V
D
S2
total)
O3
and
)
Figure 28 shows that in natural convection the maxi-
mum operating ambient temperature for this module is
approximately 66 °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 4.86 W, the thermal resistance is:
This corresponds to an airflow greater than 0.38 ms
(75 fpm) in Figure 28.
T
T
P
air (°C/W)
(W) at the desired operating condition
CA
A
Cmax
D
total is the total power dissipated by the module
is the ambient inlet temperature (°C)
is the thermal resistance from case-to-ambient
is the desired maximum case temperature (°C)
CA
ð
85 C 65 C
-------------------------------------
CA
4.86 W
=
–
T
----------------------------
Cmax
P
Dtotal
–
=
T
A
4.1°C/W
Lineage Power
April 2009
–1