GE Industrial Solutions JRW450U Orca Series - Manual (Page 8)

GE
Data Sheet
JRCW450U Orca Series; DC-DC Converter Power Modules
36–75 Vdc Input; 48.0Vdc Output; 450W Output
June 7, 2013 ©2012 General Electric Company. All rights reserved. Page 8
Feature Description (continued)
delivered by the module is defined as the voltage at the
output terminals multiplied by the output current. When using
remote sense and trim: the output voltage of the module can
be increased, which at the same output current would
increase the power output of the module. Care should be
taken to ensure that the maximum output power of the
module remains at or below the maximum rated power.
Figure 11. Effective Circuit Configuration for Single-Module
Remote-Sense Operation Output Voltage.
Output Voltage Programming
Trimming allows the user to increase or decrease the output
voltage set point of a module. Trimming down is
accomplished by connecting an external resistor between the
TRIM pin and the SENSE(-) pin. Trimming up is accomplished
by connecting external resistor between the SENSE(+) pin and
TRIM pin. The trim resistor should be positioned close to the
module. Certain restrictions apply to the input voltage lower
limit when trimming the output voltage to the maximum. See
Figure 12 for the allowed input to output range when using
trim. If not using the trim down feature, leave the TRIM pin
open.
Figure 12. Output Voltage Trim Limits vs. Input Voltage.
Trim Down – Decrease Output Voltage
With an external resistor (R
adj_down
) between the TRIM and
SENSE(-) pins, the output voltage set point (V
o,adj
) decreases
(see Figure 13). The following equation determines the
required external-resistor value to obtain a percentage output
voltage change of %.
For output voltages: V
O,nom
= 48V
 








k R
down adj
2
%
100
_
Where,
100 %
,
, 

 
nom o
desired nom o
V
V V
V
desired
= Desired output voltage set point (V).
Figure 13. Circuit Configuration to Decrease Output
Voltage.
Trim Up – Increase Output Voltage
With an external resistor ( R adj_up
) connected between the
SENSE(+) and TRIM pins , the output voltage set point ( V
o, ad j
)
increases (see Figure 14).
The following equation determines the required external-
resistor value to obtain a percentage output voltage change
of %.
For output voltages: V
O,nom
= 48V
Figure 14. Circuit Configuration to Increase Output Voltage.








  

 
  

k
V
R nom O
up adj
%
%)) 2 ( 100 (
% 225 . 1
%) 100 (
,
_
Where,
100 %
,
, 

 
nom o
nom o desired
V
V V
V
desired
= Desired output voltage set point (V).