JAHW100Y1 Lineage Power, JAHW100Y1 Datasheet - Page 15

• Manufacturer Part Number: JAHW100Y1
• Description: CONVERTER DC/DC 1.8V 36W OUT
• Manufacturer: Lineage Power
• Series: JAHWr
• Type: Isolated with Remote On/Offr

Specifications of JAHW100Y1

• Output: 1.8V
• Number Of Outputs: 1
• Power (watts): 36W
• Mounting Type: Through Hole
• Voltage - Input: 36 ~ 75V
• Package / Case: 9-DIP Module
• 1st Output: 1.8 VDC @ 20A
• Size / Dimension: 2.40" L x 2.28" W x 0.50" H (61mm x 57.9mm x 12.7mm)
• Power (watts) - Rated: 36W
• Operating Temperature: -40°C ~ 100°C
• Efficiency: 88.4%
• Approvals: CE, CSA, UL, VDE
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• 3rd Output: -
• 2nd Output: -
• 4th Output: -

April 2008
Thermal Considerations
Heat Transfer with Heat Sinks
Solution
Given: V
Determine P
Then solve the following equation:
Use Figure 30 to determine air velocity for the 1/4 inch
heat sink.
The minimum airflow necessary for the JAHW100Y
module is 0.91 m/s (180 ft./min.).
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 31.
Figure 31. Resistance from Case-to-Sink and
Lineage Power
θ
θ
θ
ca
ca
ca
I
T
T
Heat sink = 1/4 inch.
P
O
P
=
=
=
A
C
I
D
D
= 20 A
= 48 V
= 65 °C
= 85 °C
= 5.2 W
Sink-to-Ambient
3.85 °C/W
D
(
----------------------- -
(
----------------------- -
T
85 65
by using Figure 29:
C
T
5.2
P
C
–
–
D
T
A
)
)
θcs
dc-dc Converters; 36 to 75 Vdc Input, 1.8 Vdc Output; 18 W to 36 W
T
S
(continued)
θsa
(continued)
T
A
8-1304 (F).e
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.
EMC Considerations
For assistance with designing for EMC compliance,
please refer to the FLTR100V10 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 data sheet
(DS99-294EPS).
θ
sa
=
(
------------------------ -
T
C
P
–
D
T
A
)
–
θ
cs
15