19
GLOBAL ENERGY EFFICIENCY SPECIALIST
NAD12S10-A
DC-DC Converter Technical Manual V1.1
PCB Layout Considerations
C
in
V
in
GND
C
out
V
out
GND
Through
hole
Through
hole
Through
hole
Through
hole
Figure 72: Recommend PCB layout
To ensure the filtering effects, place the Cin and
C
out
symmetrically near the pins. The following
figure shows the cable hole layouts at the input
and output terminals.
Input Undervoltage Protection
The converter will shut down after the input voltage
drops below the undervoltage protection threshold
for shutdown. The converter will start to work again
after the input voltage reaches the input
undervoltage protection threshold for startup. For
the Hysteresis, see the Protection characteristics.
Output Overcurrent Protection
The converter equipped with current limiting
circuitry can provide protection from an output
overload or short circuit condition. If the output
current exceeds the output overcurrent protection
set point, the converter enters hiccup mode. When
the fault condition is removed, the converter will
automatically restart.
Output Overvoltage Protection
When the voltage directly across the output
pins exceeds the output overvoltage protection
threshold, the converter will be latched off. After
the overvoltage condition is removed, enable the
converter by cycling the input power, the
converter can restart.
Overtemperature Protection
A temperature sensor on the converter senses the
average temperature of the module. It protects the
converter from being damaged at high temperatures.
When the temperature exceeds the
Overtemperature protection threshold, the output
will shut down. It will allow the converter to turn on
again when the temperature of the sensed location
falls by the value of Overtemperature Protection
Hysteresis.
Qualification Testing
Parameter Units Condition
High Accelerated Life
Test (HALT)
4
Lowest operating temperature: -60°C (-76°F); highest operating
temperature: 120°C (248°F); vibration limit: 40 G
Power Temperature
Cycle (PTC)
16
Rating input voltage,50% - 80% load;1000 temperature cycles
between -40°C (-40°F) and + 55°C 131°F) with the temperature
change rate of 5°C (41°F) - 10°C (50°F) per minute; Lasting for 30
minutes both at -40°C (-40°F) and + 55°C (131°F)
Temperature Humidity
Bias (THB)
16
Maximum input voltage; 85°C (185°F); 85% RH; 1000 operating
hours under lowest load power
High Temperature
Operation Bias (HTOB)
16
Rating input voltage; air flow:0.5 m/s (100 FLM) to 5 m/s (1000
FLM); 1000 operating hours under 50% - 80% load power; air
temperature:45°C(113°F) - 55°C(131°F)