CMMDW48S3.3-5500 Wall Industries,Inc., CMMDW48S3.3-5500 Datasheet - Page 6

• Manufacturer Part Number: CMMDW48S3.3-5500
• Description: 18w Dc/dc Chassis Mount Converter 18-75 Vdc Input 3.3 Vdc Single Output At 5500ma
• Manufacturer: Wall Industries,Inc.

Thermal Consideration
The power module operates in a variety of thermal environments. However, sufficient cooling should be provided
to help ensure reliable operation of the unit. Heat is removed by conduction, convention, and radiation to the
surrounding environment. Proper cooling can be verified by measuring the point as the figure below. The
temperature at this location should not exceed 105°C. When operating, adequate cooling must be provided to
maintain the test point temperature at or below 105°C. Although the maximum point temperature of the power
modules is 105°C, you can limit this temperature to a lower value for extremely high reliability.
Output Voltage Adjustment
Output voltage set point adjustment allows the user to increase or decrease the output voltage set point of a
module. This is accomplished by connecting an external resistor between the TRIM pin and either the +Vout or
-Vout pins. With an external resistor between the TRIM and -Vout pin, the output voltage set point increases. With
an external resistor between the TRIM and +Vout pin, the output voltage set point decreases.
(888) 597-WALL
Figure 4
Figure 3
www.wallindustries.com
Rev. A
Table 1
Trim
10%
1%
2%
3%
4%
5%
6%
7%
8%
9%
3.333V
3.366V
3.399V
3.432V
3.465V
3.498V
3.531V
3.564V
3.597V
3.630V
Trim
CMMDW48S3.3-5500
Measurement shown in inches (mm)
up
57.930 kΩ
26.165 kΩ
15.577 kΩ
10.283 kΩ
7.106 kΩ
4.988 kΩ
3.476 kΩ
2.341 kΩ
1.459 kΩ
0.853 kΩ
R
TECHNICAL DATASHEET
CMMDW48S3.3-5500
up
Trim
3.267V
3.234V
3.201V
3.168V
3.135V
3.102V
3.069V
3.036V
3.003V
2.970V
down
69.470 kΩ
31.235 kΩ
18.490 kΩ
12.117 kΩ
8.294 kΩ
5.745 kΩ
3.924 kΩ
2.559 kΩ
1.497 kΩ
0.647 kΩ
R
down
Page 6 of 11