JC050B Lineage Power, JC050B Datasheet - Page 11

• Manufacturer Part Number: JC050B
• Description: CONVERTER DC/DC 12V 50W OUT
• Manufacturer: Lineage Power
• Series: JC050r
• Type: Isolated with Remote On/Offr

Specifications of JC050B

• Output: 12V
• Number Of Outputs: 1
• Power (watts): 50W
• Mounting Type: Through Hole
• Voltage - Input: 18 ~ 36V
• Package / Case: 9-DIP Module
• 1st Output: 12 VDC @ 4.2A
• Size / Dimension: 2.40" L x 2.28" W x 0.52" H (61mm x 57.9mm x 13.2mm)
• Power (watts) - Rated: 50W
• Operating Temperature: -40°C ~ 100°C
• Efficiency: 85%
• Approvals: CSA, UL, VDE
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• 3rd Output: -
• 2nd Output: -
• 4th Output: -

Thermal Considerations
Introduction
Note: Top view, pin locations are for reference.
Figure 20. Case Temperature Measurement
The temperature at this location should not exceed
100 °C. The output power of the module should not
exceed the rated power for the module as listed in the
Ordering Information table.
Although the maximum case temperature of the power
modules is 100 °C, you can limit this temperature to a
lower value for extremely high reliability.
For additional information on these modules, refer to the
Thermal Management JC-, JFC-, JW-, and JFW-Series
50 W to 150 W Board-Mounted Power Modules Technical
Note (TN97-008EPS).
Heat Transfer Without Heat Sinks
Increasing airflow over the module enhances the heat
transfer via convection. Figure 21 shows the maximum
power that can be dissipated by the module without
exceeding the maximum case temperature versus local
ambient temperature (T
through 4 m/s (800 ft./min.).
Note that the natural convection condition was mea-
sured at 0.05 m/s to 0.1 m/s (10 ft./min. to 20 ft./min.);
however, systems in which these power modules may
be used typically generate natural convection airflow
rates of 0.3 m/s (60 ft./min.) due to other heat dissipat-
ing components in the system. The use of Figure 21 is
shown in the following example.
7.6 (0.3)
Measurements shown in millimeters and (inches).
March 2008
Lineage Power
Location
V
ON/OFF
CASE
V
I
I
(continued)
(+)
(–)
38.0 (1.50)
A
) for natural convection
+ SEN
– SEN
V
TRIM
V
O
O
(+)
(–)
(continued)
MEASURE CASE
TEMPERATURE HERE
8-716 (C).f
18 Vdc to 36 Vdc Input, 12 Vdc Output; 50 W to 100 W
Example
What is the minimum airflow necessary for a JC100B
operating at nominal line, an output current of 8.5 A,
and a maximum ambient temperature of 40 °C?
Solution
Given: V
Determine P
Determine airflow (v) (Use Figure 21.):
Figure 21. Forced Convection Power Derating with
Figure 22. JC050B Power Dissipation vs.
35
30
25
20
15
10
12
10
6
4
5
0
8
2
0
0.0
0
I
T
P
v = 2.5 m/s (500 ft./min.)
O
A
I
D
= 8.5 A
= 28 V
= 40 °C
= 20 W
0.1 m/s (NAT. CONV.)
10
No Heat Sink; Either Orientation
Output Current
D
0.6
(Use Figure 24.):
LOCAL AMBIENT TEMPERATURE, T
20
(20 ft./min.)
1.2
OUTPUT CURRENT, I
30
V
V
V
I
I
I
40
= 18
= 27
= 36
1.8
50
2.4
60
4.0 m/s (800 ft./min
3.5 m/s (700 ft./min
3.0 m/s (600 ft./min
2.5 m/s
2.0 m/s
1.5 m/s (300 ft./min
1.0 m/s (200 ft./min
0.5 m/s (100 ft./min
O
(A)
70
3.0
(500 ft./min
(400 ft./min
A
80
(˚C)
3.6
8-1150 (C).a
90
8-1249
100
4.2
11