TDK-Lambda NV350FEP Mode D'emploi page 15

NV350FEP Handbook
The Global Options Inhibit and Enable functions permit the customer to turn off or on the main psu outputs and the
fan. The standby supply is for use by the customer and provides an SELV output that continues to operate when all
the main psu outputs have been turned off using the Inhibit or Enable functions. All the functions of the Global
Option pass through a single 8 way PWB socket and are all rated SELV.
Followed by @FE
where @ is the output voltage of the module and is within the range given in the FE module table as follows:
NV350 FEP Module:
Nominal Voltage Voltage Range
(V)
12
Nominal Voltage Voltage Range
(V)
12
* - Total Output Power must not exceed 350W.
# Voltage measured at the module power terminals must not exceed the value shown in the table when remote
sense is used. For 50°C max. ambient operation: 11.5 – 12.5V 350W total power. From 12.5 – 13.2V: Linearly
derate total power from 350 to 306W. For 350W total output power (O/P 1 + O/P 2) : 11.5 – 12.5V: 50°C max.
ambient. From 12.5 – 13.2V: Linearly derate max. ambient from 50 to 45°C
Cooling Options
COOLING OPTION
S (FORWARD AIRFLOW)
R (REVERSE AIRFLOW)
C (CUSTOMER AIR)
The above ratings apply for ambient temperatures up to 50°C. From 50 to 65°C the total output power and the
module current ratings are both derated at 2.5% per °C.
Global Option standby outputs (12V at 1A or 5V at 2A) should not be included when calculating total PSU output
power, but they are subject to the output current deratings for operation above 50°C.
5V global options are derated to 1.8A max. when the psu is inhibited
Customer Air Cooling (option C):
The following method must be used for determining the safe operation of PSUs when C option (Customer Air) is
fitted, ie fan not fitted to PSU.The minimum permitted airflow for customer air cooling is 0.5 m/s.
For PSUs cooled by customer supplied airflow the components listed in the following table must not exceed the
temperatures given. Additionally ratings specified for units with an internal fan must still be complied with, eg mains
input voltage range, maximum output power, module voltage / current ratings and maximum ambient temperature.
To determine the component temperatures the heating tests must be conducted in accordance with the requirements
of EN60950-1:2001 Clause 4.5. Consideration should also be give to the requirements of other safety standards.
Test requirements include: PSU to be fitted in its end-use equipment and operated under the most adverse
conditions permitted in the end-use equipment handbook/specification and which will result in the highest
temperatures in the PSU. To determine the most adverse conditions consideration should be given to the end use
equipment maximum operating ambient, the PSU loading and input voltage, ventilation, end use equipment
orientation, the position of doors & covers, etc. Temperatures should be monitored using type K fine wire
thermocouples (secured with cyanoacrylate adhesive, or similar) placed on the hottest part of the component (out of
any direct airflow) and the equipment should be run until all temperatures have stabilised.
FE Module, Output 1
Max. Current (A)
(V) #
11.5 - 13.2
FE Module, Output 2
Max. Current (A)
(V)
Fixed 12V
TOTAL POWER
350W
350W
350W
29.2
2
Page 15 of 23
Max. Power (W)
350*
Max. Power (W)
24.2*
17197 issue 17, October 2018