Product Specifications

NV Series: 4 - 6W DC/DC Converters

Oct 2001

9-36V, 18-36V, 36-72V & 16-75V Inputs

3.3V, 5.0V, 12V, 15V, ±5.0V, ±12V, ±15V & ±24V Outputs

18-Oct-01

Rev 1.0

Page 5 of 11

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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

18-36V

and

36-75V

input voltage ranges :

The 9-36V and 18-75V input voltage versions of

this series feature a 4:1 input voltage range and

can achieve operation at full power at 85ºC

ambient temperature with only convection cooling.

Temperature derating for 9-36V and 18-75V input

voltage ranges :

Typical Application

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 input terminals may be

required to stabilize the input voltage. A minimum

of 0.47µF, quality electrolytic / ceramic capacitor

is recommended for this purpose.

For output

decoupling it is recommended to connect, directly

across

the

output

pins,

a

0.47µF

ceramic

capacitor (for 3.3V and 5V outputs) or a 0.27µF

ceramic capacitor (for other outputs).

Care must be taken to ensure the maximum rated

output capacitance for the device is not exceed

when dimensioning decoupling capacitors in the

system as this could cause the unit to detect an

overload and enter a ‘hiccup’ mode of operation.

Output Power Vs Ambient Temp. & Airflow

0

20

40

60

80

100

120

Ambient Temp. (deg °C)

400LFM (2 m/s)

200LFM (1 m/s)

0 LFM

Output Power Vs Ambient Temp. & Airflow

0

20

40

60

80

100

120

Ambient Temp. (deg °C)

200LFM (1 m/s)

0 LFM