GE Industrial Solutions JRCW450R Orca Series - Manual (Page 9)

GE
Data Sheet
JRCW450R Orca Series; DC-DC Converter Power Modules
36–75 Vdc Input; 32.0Vdc Output; 450W Output
May 8, 2013 ©2012 General Electric Company. All rights reserved. Page 9
Feature Description (continued)
For output voltages: V
O,nom
= 32V
Without –T Option








  

 
  

k
V
R nom O
up adj
%
%) 2 ( 100 (
% 225 . 1
%) 100 (
,
_
With –T Option
 








k R
up adj
12 . 15
%
27122
_
Where,
100 %
,
, 

 
nom o
nom o desired
V
V V
V
desired
= Desired output voltage set point (V).
Figure 14. Circuit Configuration to Increase Output Voltage.
The voltage between the Vo(+) and Vo(-) terminals must not
exceed the minimum output overvoltage shut-down value
indicated in the Feature Specifications table. This limit
includes any increase in voltage due to remote- sense
compensation and output voltage set-point adjustment (trim).
See Figure 11.
Although the output voltage can be increased by both the
remote sense and by the trim, the maximum increase for the
output voltage is not the sum of both.
The maximum increase is the larger of either the remote
sense or the trim.
The amount of power 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 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.
Examples:
To trim down the output of a nominal 32V module, without –T
option, to 16.8V
% 5 . 47 100
32
8 . 16 32
%
 

 
V
V V
   





 
105 2
5 . 47
100
_
K R
down adj
To trim up the output of a nominal 32V module, without –T
option, to 35.2V
% 10 100
32
32 2 . 35
%
 

 
V
V V




  


 

10
) 10 2 ( 100 (
10 225 . 1
) 10 100 ( 32
_ up adj
R
R
adj _ up
= 275.3kΩ
Active Voltage Programming
For both the JRCW450Rx and JRCW450Rx-T, a Digital-Analog
converter (DAC), capable of both sourcing and sinking current,
can be used to actively set the output voltage, as shown in
Figure 15. The value of R
G
will be dependent on the voltage
step and range of the DAC and the desired values for trim-up
and trim-down
∆%. Please contact your GE technical
representative to obtain more details on the selection for this
resistor.
Figure 15. Circuit Configuration to Actively Adjust the
Output Voltage.
Tunable Loop
The JRCW450Rx-T modules have a new feature that optimizes
transient response of the module called Tunable Loop.
External capacitors are usually added to the output of the
module for two reasons: to reduce output ripple and noise
and to reduce output voltage deviations from the steady-
state value in the presence of dynamic load current changes.
Adding external capacitance however affects the voltage
control loop of the module, typically causing the loop to slow
down with sluggish response. Larger values of external
capacitance could also cause the module to become
unstable.
The Tunable Loop allows the user to externally adjust the
voltage control loop to match the filter network connected to
the output of the module. The Tunable
Loop is implemented
by connecting a series R-C between the SENSE(+) and TRIM
pins of the module, as shown in Fig. 16. This R-C allows the