GE Industrial Solutions JNCW016A0R Orca Series - Manual (Page 8)

GE
Data Sheet
JNCW016A0R Orca Series; DC-DC Converter Power Modules
36–75 Vdc Input; 28.0Vdc Output; 16Adc Output
August 14, 2013 ©2012 General Electric Company. All rights reserved. Page 8
Feature Description (continued)
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. If not using the remote-sense feature to
regulate the output at the point of load, then connect
SENSE(+) to V
o
(+) and SENSE(-) to V
o
(-) at the module.
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 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.
Figure 12. Output Voltage Trim Limits vs. Input Voltage.
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.
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
= 28V
Without –T Option With –T Option
 








k R
down adj
2
%
100
_
 








k R
down adj
11
%
1000
_
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
= 28V
The voltage between the Vo(+) and Vo(-) terminals must not
exceed the minimum output overvoltage shut-down value
indicated in the Feature Specifications table.
15
20
25
30
35
35 40 45 50 55 60 65 70 75
Vin (V)
Vo
u
t (
V
)
Upper Trim Limit
Lower Trim Limit
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).