40W DC/DC
|
DC/DC CONVERTERS
40 Watt
Wide input DC/DC converters
Derating Curves
The derating curves shown are based on measurements of actual
power supplies and reflect Artesyn Technologies conservative
design guidelines. Adherence to these guidelines contributes to the
high reliability of our products by restricting the maximum operating
semiconductor junction temperatures to 125°C which is well below
the component manufacturers’ maximum limits.
Key to power derating curves:
A
B
C
D
Natural convection.
150 linear feet per minute forced air flow.
300 linear feet per minute forced air flow.
Maximum case temperature
- MX or
-1X
Side Mounted
21
- MY or
(0..08
-1Y
83
)
21
(0..08
83
)
Heatsink Mounting Options
Top Mounted
Power Derating Curve
Without Additional Heatsink
71
100
OUTPUT POWER (%)
A
"-4" OPTION
75
50
25
0
-40
-20
0
20
40
60
80
100
120
AMBIENT TEMPERATURE (°C)
D
B
C
7
(36.2
.00
- MS or
)
-1S
7
(36.2
.00
)
- ME or
-1E
Heatsink options:
Two heatsink kits are available for the NFC40: top mounted and side
mounted. Each heatsink may be oriented parallel to or perpendicular
to the direction of the pins, thus providing optimum flexibility for
cooling requirements.
Top mounted heatsink
If board area is at a premium in your application then the top
mounted heatsink should be used. This heatsink kit comes com-
plete with screws and is mounted as shown in the diagram over. To
fit the heatsink, place it in the required orientation, and tighten the
four screws. The order number for the top mounted heatsink kit with
Metric screws is:
NFC40-HTSK-T.
The order number for the top
mounted heatsink kit with Imperial screws is:
NFC40-HTSK-T-I.
Side mounted heatsink
With many applications, e.g. rack systems, the profile must be kept
to a minimum. The side mounted heatsink is intended to meet the
requirements of low profile applications. The NFC40 with this
heatsink option is 12.7mm (0.5 inch) high. The kit contains two side
mounted heatsinks, which must be fitted opposite to one another on
the NFC40. The order number for the side mounted heatsink is:
NFC40-HTSK-S
Factory fitted heatsinks
As a further option, Artesyn Technologies offers factory fitted
heatsinks. Simply add the suffix as described by the diagrams
above to the part number: e.g.
NFC40-48S12-MY
or
NFC40-
48S12-1Y
for Metric and Imperial screws respectively.
D
B
C
Power Derating Curve
With Side Mounted Heatsink
100
OUTPUT POWER (%)
"-4" OPTION
75
50
25
0
-40
-20
0
20
40
60
80
100
120
AMBIENT TEMPERATURE (°C)
A
B
C
D
Power Derating Curve
With Top Mounted Heatsink
100
OUTPUT POWER (%)
A
"-4" OPTION
75
50
25
0
-40
-20
0
20
40
60
80
100
120
EXTERNAL OUTPUT TRIMMING
(8)
Output can be externally trimmed
by ±10% using either method shown below.
PIN 7
10K
PIN 8
TRIM
DOWN
TRIM
UP
PIN 9
TRIM
UP/DOWN
DS_NFC40_20000101.PDF
AMBIENT TEMPERATURE (°C)
PAGE 144
ARTESYN [ ARTESYN TECHNOLOGIES ]
