QHW075Y1 Lineage Power, QHW075Y1 Datasheet - Page 17

• 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: -

April 2008
Custom Heat Sinks
A more detailed model can be used to determine the
required thermal resistance of a heat sink to provide
necessary cooling. The total module resistance can be
separated into a resistance from case-to-sink (θcs) and
sink-to-ambient (θsa) as shown in Figure 36.
Figure 36. Resistance from Case-to-Sink and
For a managed interface using thermal grease or foils,
a value of θcs = 0.1 °C/W to 0.3 °C/W is typical. The
solution for heat sink resistance is:
This equation assumes that all dissipated power must
be shed by the heat sink. Depending on the user-
defined application environment, a more accurate
model, including heat transfer from the sides and bot-
tom of the module, can be used. This equation pro-
vides a conservative estimate for such instances.
Lineage Power
θ
sa
=
P
D
Sink-to-Ambient
(
------------------------ -
T
C
T
P
–
C
D
T
A
)
–
θ
θ
cs
cs
dc-dc Converters: 36 to 75 Vdc Input, 1.8 Vdc Output; 18 W to 36 W
T
S
θ
sa
T
A
8-1304(F).e
EMC Considerations
For assistance with designing for EMC compliance,
please refer to the FLTR100V10 Filter Module Data
Sheet (DS99-294EPS).
Layout Considerations
Copper paths must not be routed beneath the power
module mounting inserts. For additional layout guide-
lines, refer to the FLTR100V10 Filter Module Data
Sheet (DS99-294EPS).
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