QHW075Y1 Lineage Power, QHW075Y1 Datasheet - Page 14

• Manufacturer Part Number: QHW075Y1
• Description: CONVERTER DC/DC 1.8V 27W OUT
• Manufacturer: Lineage Power
• Series: QHWr
• Type: Isolated with Remote On/Offr

Specifications of QHW075Y1

• Output: 1.8V
• Number Of Outputs: 1
• Power (watts): 27W
• Mounting Type: Through Hole
• Voltage - Input: 36 ~ 75V
• Package / Case: 8-DIP Module
• 1st Output: 1.8 VDC @ 15A
• Size / Dimension: 2.28" L x 1.45" W x 0.50" H (57.9mm x 36.8mm x 12.7mm)
• Power (watts) - Rated: 27W
• Operating Temperature: -40°C ~ 100°C
• Efficiency: 82%
• Approvals: CE, CSA, UL, VDE
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• 3rd Output: -
• 2nd Output: -
• 4th Output: -

dc-dc Converters: 36 to 75 Vdc Input, 1.8 Vdc Output; 18 W to 36 W
Thermal Considerations
Heat Transfer Without Heat Sinks
Figure 28. QHW075Y1 Power Dissipation vs.
Figure 29. QHW100Y1 Power Dissipation vs.
14
14
10
8
7
6
5
4
3
2
1
0
9
8
7
6
5
4
3
2
1
0
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
2
3 4 5 6 7 8 9 10
V
V
V
Output Current at 25 °C
Output Current at 25 °C
I
I
I
= 75 V
= 48 V
= 36 V
V
V
V
I
I
I
= 75 V
= 48 V
= 36 V
OUTPUT CURRENT, I
OUTPUT CURRENT, I
11 12 13 14 15 16 17 18 19 20
(continued)
O
O
(A)
(A)
(continued)
8-3465(F)
1-0035
Heat Transfer with Heat Sinks
The power modules have through-threaded, M3 x 0.5
mounting holes, which enable heat sinks or cold plates
to attach to the module. The mounting torque must not
exceed 0.56 N-m (5 in.-lb.). For a screw attachment
from the pin side, the recommended hole size on the
customer’s PWB around the mounting holes is 0.130
± 0.005 inches. If a larger hole is used, the mounting
torque from the pin side must not exceed 0.25 N-m
(2.2 in.-lbs.).
Thermal derating with heat sinks is expressed by using
the overall thermal resistance of the module. Total
module thermal resistance (θca) is defined as the max-
imum case temperature rise (ΔT
module power dissipation (P
The location to measure case temperature (T
shown in Figure 24. Case-to-ambient thermal resis-
tance vs. airflow is shown, for various heat sink config-
urations, heights, and orientations, as shown in Figures
30 and 31. Longitudinal orientation is defined as when
the long axis of the module is parallel to the airflow
direction, whereas in the transverse orientation, the
long axis is perpendicular to the airflow. These curves
were obtained by experimental testing of heat sinks,
which are offered in the product catalog.
Figure 30. Case-to-Ambient Thermal Resistance
θ
ca
10
9
8
7
6
5
4
3
2
1
0
0
=
Curves; Transverse Orientation
ΔT
-------------------- -
(100)
0.5
P
C max
,
D
VELOCITY, m/s (ft./min.)
(200)
1.0
=
(
----------------------- -
T
D
(300)
C
1.5
):
P
–
D
C, max
T
A
NO HEAT SINK
1/4 IN. HEAT SINK
1/2 IN. HEAT SINK
1 IN. HEAT SINK
)
(400)
2.0
) divided by the
Lineage Power
April 2008
(500) (600)
2.5
C
) is
8-2323(F)
3.0