GE Industrial Solutions NQR002A0X4 - Manual (Page 13)

Preliminary Data Sheet
February 28, 2012 NQR002A0X4: Non-Isolated DC-DC Power Modules
3 – 14Vdc input; 0.6Vdc to 5.5Vdc Output; 2A output current
LINEAGE POWER 13
Figure 5. Output ripple voltage for various output
voltages with external 1x10 µF, 1x47 µF, 2x47 µF or
4x47 µF ceramic capacitors at the output (2A load).
Input voltage is 12V.
Safety Considerations
For safety agency approval the power module must be
installed in compliance with the spacing and separation
requirements of the end-use safety agency standards,
i.e., UL 60950-1, CSA C22.2 No. 60950-1-03, and VDE
0850:2001-12 (EN60950-1) Licensed.
For the converter output to be considered meeting the
requirements of safety extra-low voltage (SELV), the
input must meet SELV requirements. The power
module has extra-low voltage (ELV) outputs when all
inputs are ELV.
An input fuse for the module is recommended. Due to
the wide input voltage and output voltage ranges of the
module, a 4A, 125Vdc fast acting fuse is recommended
Feature Descriptions
Enable (Remote On/Off)
The NQR002A0X4 2A power modules feature a Enable
pin with positive logic for remote On/Off operation. If the
Enable pin is not being used, leave the pin open (the
module will be ON). The Enable signal (V
On/Off
) is
referenced to ground. During a Logic High on the
Enable pin, the module remains ON. During Logic-Low,
the module is turned OFF.
Figure 6. Remote On/Off Implementation(positive
logic).
Overcurrent Protection
To provide protection in a fault (output overload)
condition, the unit is equipped with internal
current-limiting circuitry and can endure current limiting
continuously. At the point of current-limit inception, the
unit enters hiccup mode. The unit operates normally
once the output current is brought back into its specified
range. The average output current during hiccup is 10%
I
O, max
.
Overtemperature Protection
To provide protection in a fault condition, these modules
are equipped with a thermal shutdown circuit. The unit
will shut down if the overtemperature threshold of 130ºC
is exceeded at the thermal reference point T
ref
. The
thermal shutdown is not intended as a guarantee that
the unit will survive temperatures beyond its rating.
Once the unit goes into thermal shutdown it will then
wait to cool before attempting to restart.
Input Undervoltage Lockout
At input voltages below the input undervoltage lockout
limit, the module operation is disabled. The module will
begin to operate at an input voltage above the
undervoltage lockout turn-on threshold.
Q1
VIN+
GND
+
PWM Enable
ON/OFF
V
ON/OFF
_
MODULE
I
Rpullup
ON/OFF
10K
Q2
10K
20K
20K
Q3
10K
10K