Data Sheet
EQW006 Series, Eight Brick Power Modules: DC-DC Converter
36 – 75Vdc Input; 12Vdc Output; 6A Output Current
March 26, 2008
Connecting an external resistor (Rtrim-up) between the
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 VO(+) pin or the VO(-) pin (COM pin) .
TRIM pin and the VO(+) (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
5.1×Vo, set ×(100 + Δ%)
1.225×Δ%
510
⎡
⎤
Rtrim −up =
−
−10.2 ΚΩ
⎢
⎥
Δ%
⎣
⎦
VIN(+)
VO(+)
VOTRIM
VO(-)
Where
Rtrim-up
⎛Vdesired −Vo, set ⎞
Δ% = ⎜ ⎟×100
ON/OFF
⎜
⎟
LOAD
Vo, set
⎝
⎠
For example, to trim-up the output voltage of 12V
module by 6% to 12.72V, Rtrim-up is calculated is as
follows:
Rtrim-down
VIN(-)
Δ% = 6
5.1×12×(100 + 6) 510
⎡
⎤
Rtrim − up =
−
−10.2 ΚΩ
⎢
⎥
1.225×6
6
⎣
⎦
Figure 12. Circuit Configuration to Trim Output
Voltage.
Rtrim − up = 787ΚΩ
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.
Connecting an external resistor (Rtrim-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%.
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).
The following equation determines the required
external resistor value to obtain a percentage output
voltage change of Δ%
For output voltage: 12Vdc
510
⎡
⎤
Rtrim − down =
−10.2 ΚΩ
⎢
⎣
⎥
Δ%
⎦
Where
⎛Vo, set −Vdesired ⎞
Δ% = ⎜ ⎟×100
⎜
⎟
Vo, set
⎝
⎠
For example, to trim-down the output voltage of 12V
module (EQW006A0B1) by 8% to 11.04V, Rtrim-
down is calculated as follows:
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
Δ% = 8
510
8
⎡
⎤
Rtrim − down =
−10.2 ΚΩ
⎢
⎥
⎣
⎦
Rtrim − down = 53.55ΚΩ
current during hiccup is 10% IO, max
.
LINEAGE POWER
10
LINEAGEPOWER [ LINEAGE POWER CORPORATION ]
