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NV Series Data Sheet
6 W SMT DC-DC Converters, 3.3 – 48 V Output
Application and Auxiliary Functions
Temperature Derating Curves
The derating curves below give an indication of the
output power achievable with and without forced-air
cooling. However in the final application the
temperature rise of the converter is also influenced by
factors such as heat conduction through the leads to
the PCB, orientation, the temperature of surrounding
components and the input voltage. To ensure the
reliability of the converter, care must be taken to
guarantee that the maximum case temperature is not
exceeded under any conditions. The measurement
point for case temperature is specified on the
mechanical drawing (Tc).
Temperature derating for 18 – 36 V and 36 – 75 V
input voltage ranges:
The 9 – 36 V and 18 – 75 V input voltage versions of
this series feature a 4:1 input voltage range and can
operate at full power at 85 oC ambient temperature
with only convection cooling.
Temperature derating for 9 – 36 V and 18 – 75 V input
voltage ranges:
Temperature Derating for 4:1 Input Ratio Models
120
100
80
60
200LFM (1 m/s)
Temperature Derating for 2:1 Input Ratio
Models
40
0 LFM
120
100
80
60
400LFM (2 m/s)
20
0
Ambient Temp. (deg °C)
200LFM (1 m/s)
Typical Application
40
20
0 LFM
This series of converters does not require any external
components for proper operation. However, if the
distribution of the input voltage to the converter
contains significant inductance, a capacitor across the
0
Ambient Temp. (deg °C)
input terminals may be required to stabilize the input
voltage. A minimum of 0.47 μ F, quality electrolytic or
ceramic capacitor, is recommended for this purpose.
For output decoupling it is recommended to connect,
directly across the output pins, a 0.47 μ F ceramic
capacitor (for 3.3 V and 5 V outputs) or a 0.27 μ F
ceramic capacitor (for other outputs).
Care must be taken to ensure the maximum rated
output capacitance for the device is not exceeded,
when dimensioning decoupling capacitors in the
system, as this could cause the unit to detect an
overload and enter a ‘hiccup’ mode of operation.
BCD.00014 Rev. AA, 30-June-2010
Page 6 of 11
www.power-one.com
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