Data Sheet
EQW012/020/023/025 Series, Eighth-Brick Power Modules:
36 - 75Vdc Input; 1.2Vdc to 5Vdc Output; 12A to 25A Output
December 12, 2008
Alternative voltage programming for output
voltage: 1.2V (-V Option)
Feature Description (Continued)
Output Voltage Set-Point Adjustment (Trim)
(Continued)
An alternative set of trimming equations is available
as an option for 1.0V and 1.2V output modules, by
ordering the –V option. These equations will reduce
the resistance of the external programming resistor,
making the impedance into the module trim pin lower
for applications in high electrical noise applications.
For output voltage: 1.2 V to 12V
510
100
⎡
⎤
⎡
⎤
Rtrim − down =
−10.2 ΚΩ
Rtrim − down
=
− 2 ΚΩ
⎢
⎥
⎢
⎣
⎥
⎦
Δ%
⎣
⎦
Δ %
Where
100
⎡
⎣
⎤
R trim
=
ΚΩ
− up
⎛Vo, set −Vdesired ⎞
Δ% = ⎜
⎟×100
⎢
⎥
⎦
Δ %
⎜
⎟
Vo, set
⎝
⎠
⎛
⎜
⎜
⎝
⎞
⎟
⎟
⎠
Vdesired − Vo, set
Where
Δ% =
× 100
Vo, set
For example, to trim-down the output voltage of 2.5V
module (EQW023A0G1) by 8% to 2.3V, Rtrim-down
is calculated as follows:
For example, to trim-up the output voltage of 1.2V
module (EQW025A0P/P1-V) by 5% to 1.26V, Rtrim-up
is calculated is as follows:
Δ% = 8
Δ% = 5
510
8
⎡
⎤
100
5
⎡
⎤
Rtrim − down =
−10.2 ΚΩ
R trim
=
ΚΩ
⎢
⎥
− up
⎢
⎣
⎥
⎦
⎣
⎦
Rtrim − down = 53.55ΚΩ
Rtrim −up = 20.0ΚΩ
Connecting an external resistor (Rtrim-up) between the
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%:
The value of the external trim resistor for the optional
–V 1.2V module is only 20% of the value required with
the standard trim equations.
At 48Vin (+/- 2.5V), EQW series modules can be trim
down to 20% over the entire temperature range. This
allows for margining the unit during manufacturing
process if the set point voltage is lower than the
standard output voltage. Please consult your local
Lineage Power field application engineer for
additional details.
For output voltage: 1.5 V to 12V
5.1×Vo, set ×(100 + Δ%)
1.225×Δ%
510
⎡
⎤
Rtrim −up =
−
−
−10.2 ΚΩ
⎢
⎥
Δ%
⎣
⎦
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.
For output voltage: 1.2
5.1×Vo, set ×(100 + Δ%)
510
⎡
⎤
Rtrim −up =
−10.2 ΚΩ
⎢
⎥
0.6×Δ%
Δ%
⎣
⎦
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).
Where
⎛Vdesired −Vo, set ⎞
Δ% = ⎜
⎟×100
⎜
⎟
Vo, set
⎝
⎠
For example, to trim-up the output voltage of 1.5V
module (EQW025A0M1) by 6% to 1.59V, Rtrim-up is
calculated is as follows:
Δ% = 6
5.1×1.5×(100 + 6) 510
1.225×6
Rtrim − up = 15.12ΚΩ
⎡
⎤
Rtrim − up =
−
−10.2 ΚΩ
⎢
⎥
6
⎣
⎦
LINEAGE POWER
14
LINEAGEPOWER [ LINEAGE POWER CORPORATION ]
