GE Industrial Solutions NQR002A0X4 - Manual (Page 14)

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 14
Feature Descriptions
(continued)
Output Voltage Programming
The output voltage of the NQR002A0X4 2A module can
be programmed to any voltage from 0.6dc to 5.5Vdc by
connecting a resistor between the Trim+ and GND pins
of the module. Certain restrictions apply on the output
voltage set point depending on the input voltage. These
are shown in the Output Voltage vs. Input Voltage Set
Point Area plot in Fig. 7. The Lower Limit curve shows
that for output voltages of 2.4V and higher, the input
voltage needs to be larger than the minimum of 3V.
Figure 7. Output Voltage vs. Input Voltage Set Point
Area plot showing limits where the output voltage
can be set for different input voltages.
Without an external resistor between Trim+ and GND
pins, the output of the module will be 0.6Vdc. To
calculate the value of the trim resistor, Rtrim for a
desired output voltage, use the following equation:
( )
Ω






−
= k
Vo
Rtrim
6 . 0
12
Rtrim is the external resistor in kΩ
Vo is the desired output voltage
Table 1 provides Rtrim values required for some
common output voltages.
Table 1
V
O, set
(V) Rtrim (KΩ)
0.6 Open
0.9 40
1.0 30
1.2 20
1.5 13.33
1.8 10
2.5 6.316
3.3 4.444
5.0 2.727
By using a ±0.5% tolerance trim resistor with a TC of
±25ppm, a set point tolerance of ±1.5% can be achieved
as specified in the electrical specification. The POL
Programming Tool available at
www.lineagepower.com
under the Design Tools section, helps determine the
required trim resistor needed for a specific output
voltage.
V
O
(+)
TRIM
GND
R
trim
LOAD
V
IN
(+)
ON/OFF
Vout
Figure 8. Circuit configuration for programming
output voltage using an external resistor.
Voltage Margining
Output voltage margining can be implemented in the
NQR002A0X4 2A modules by connecting a resistor,
R
margin-up
, from the Trim pin to the ground pin for
margining-up the output voltage and by connecting a
resistor, R
margin-down
, from the Trim pin to output pin for
margining-down. Figure 9 shows the circuit
configuration for output voltage margining. The POL
Programming Tool, available at
www.lineagepower.com
under the Design Tools section, also calculates the
values of R
margin-up
and R
margin-down
for a specific output
voltage and % margin. Please consult your local
Lineage Power Field Application Engineer or Account
Manager for additional details.
0
2
4
6
8
10
12
14
16
0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6
Output Voltage (V)
Input
Volt
ag
e
(v
)