GE Industrial Solutions EQW006 Series - Manual (Page 10)

Data Sheet
July 27, 2011
EQW006 Series, Eight Brick Power Modules: DC-DC Converter
36 – 75Vdc Input; 12Vdc Output; 6A Output Current
LINEAGE POWER 10
Feature Descriptions (continued)
Output Voltage Programming
Trimming allows the output voltage set point to be
increased or decreased, this is accomplished by
connecting an external resistor between the TRIM pin
and either the V
O
(+) pin or the V
O
(-) pin (COM pin) .
V
O
(+)
V
O
TRIM
V
O
(-)
R
trim-down
LOAD
V
IN
(+)
ON/OFF
V
IN
(-)
R
trim-up
Figure 12. Circuit Configuration to Trim Output
Voltage.
Connecting an external resistor (R
trim-down
) between
the TRIM pin and the Vo(-) (or Sense(-)) pin
decreases the output voltage set point. To maintain
set point accuracy, the trim resistor tolerance should
be ±0.1%.
The following equation determines the required
external resistor value to obtain a percentage output
voltage change of Δ%
For output voltage: 12Vdc







 
2 . 10
%
510
down Rtrim
Where
100
,
,
%






 
 
set Vo
Vdesired set Vo
For example, to trim-down the output voltage of 12V
module (EQW006A0B1) by 8% to 11.04V, Rtrim-
down is calculated as follows:
8 %
 





  
2 . 10
8
510
down Rtrim
  
55 . 53 down Rtrim
Connecting an external resistor (R
trim-up
) between the
TRIM pin and the V
O
(+) (or Sense (+)) pin increases
the output voltage set point. The following equations
determine the required external resistor value to
obtain a percentage output voltage change of Δ%:
For output voltage: 12Vdc








 
   
 
2 . 10
%
510
% 225 . 1
%) 100 ( , 1 . 5 set Vo
up Rtrim
Where
100
,
,
%






 
 
set Vo
set Vo Vdesired
For example, to trim-up the output voltage of 12V
module by 6% to 12.72V, Rtrim-up is calculated is as
follows:
6 %
 





 

  
 
2 . 10
6
510
6 225 . 1
) 6 100 ( 12 1 . 5
up Rtrim
  
787 up Rtrim
The voltage between the Vo(+) and Vo(–) terminals
must not exceed the minimum output overvoltage
protection value shown in the Feature Specifications
table. This limit includes any increase in voltage due
to remote-sense compensation and output voltage
set-point adjustment trim.
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 (Maximum rated
power = Vo,set x Io,max).
Overcurrent Protection
To provide protection in a fault (output overload)
condition, the unit is equipped with internal
current-limiting circuitry and can endure current
limiting continuously. At the point of current-limit
inception, the unit enters hiccup mode. The unit
operates normally once the output current is brought
back into its specified range. The average output
current during hiccup is 10% I
O, max
.