GE Industrial Solutions Naos Raptor 3A - Manual (Page 15)

Data Sheet
December 6, 2010 Naos Raptor 3A: Non-isolated DC-DC Power Modules
4.5 – 14Vdc input; 0.59Vdc to 6Vdc Output; 3A output current
LINEAGE POWER 15
Feature Descriptions (continued)
Output Voltage Programming
The output voltage of the Naos Raptor 3A module can
be programmed to any voltage from 0.59dc to 6Vdc 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. 49. The Upper Limit curve shows
that for output voltages of 0.9V and lower, the input
voltage must be lower than the maximum of 14V. The
Lower Limit curve shows that for output voltages of 3.8V
and higher, the input voltage needs to be larger than the
minimum of 4.5V.
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
V
o
lt
a
g
e (
v
)
Lower Limit
Upper Limit
Figure 49. 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 0.59Vdc. To
calculate the value of the trim resistor, Rtrim for a
desired output voltage, use the following equation:
( )
Ω
−
= k
Vo
Rtrim
591 . 0
182 . 1
Rtrim is the external resistor in kΩ
Vo is the desired output voltage
Table 2 provides Rtrim values required for some
common output voltages.
Table 2
V
O, set
(V) Rtrim (KΩ)
0.59 Open
1.0 2.89
1.2 1.941
1.5 1.3
1.8 0.978
2.5 0.619
3.3 0.436
5.0 0.268
6.0 0.219
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 50. Circuit configuration for programming
output voltage using an external resistor.
Voltage Margining
Output voltage margining can be implemented in the
Naos Raptor 3A 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 51 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 technical representative for additional
details.