Data Sheet
KW010/015/020/025 Series Power Modules:
March 26, 2008
36 – 75Vdc Input; 1.2 to 5.0Vdc Output; 10 to 25A Output current
511
8
⎡
⎤
Feature Descriptions (continued)
Rtrim−down
=
−10.22 ΚΩ
⎢
⎣
⎥
⎦
current-limiting circuitry and can endure current
limiting continuously. At the point of current-limit
inception, the unit enters hiccup mode. If the unit is
not configured with auto–restart, then it will latch off
following the over current condition. The module can
be restarted by cycling the dc input power for at least
one second or by toggling the remote on/off signal for
at least one second. If the unit is configured with the
auto-restart option (4), it will remain in the hiccup
mode as long as the overcurrent condition exists; it
operates normally, once the output current is brought
back into its specified range. The average output
Rtrim − down = 53 .655 ΚΩ
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%:
For output voltage: 1.5V to 12V
5.11×V
× (100 + Δ%)
⎡
⎤
511
o,set
Rtrim −up
=
−
−
−10.22 ΚΩ
⎢
⎣
⎥
1.225 × Δ%
Δ%
⎦
current during hiccup is 10% IO, max
.
For output voltage: 1.2V
5.11×Vo,set × (100 + Δ%)
Output Voltage Programming
⎡
⎤
511
Rtrim−up
=
−10.22 ΚΩ
⎢
⎣
⎥
0.6× Δ%
Δ%
⎦
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.
⎛
⎜
⎜
⎝
⎞
⎟
⎟
⎠
Vdesired − Vo,set
Where
Δ% =
× 100
Vo,set
For example, to trim-up the output voltage of 1.2V
module (KW025A0P/P1) by 5% to 1.26V, Rtrim-up is
calculated is as follows:
VIN(+)
VO(+)
VOTRIM
VO(-)
Rtrim-up
Δ % = 5
ON/OFF
5.11 ×1.2 × (100 + 5) 511
⎡
⎤
LOAD
Rtrim −up
=
−
− 10.22 ΚΩ
⎢
⎣
⎥
⎦
0.6 × 5
5
Rtrim −up = 102.2ΚΩ
Rtrim-down
Alternative voltage programming for output
voltage: 1.2V (-V Option)
VIN(-)
An alternative set of trimming equations is available
as an option for 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
Figure 42. Circuit Configuration to Trim Output
Voltage.
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 ±1.0%.
applications in high electrical noise applications.
100
⎡
⎤
Rtrim
=
− 2 ΚΩ
− down
⎢
⎣
⎥
⎦
Δ %
100
⎡
⎣
⎤
The following equation determines the required
external resistor value to obtain a percentage output
voltage change of Δ%
R trim
=
ΚΩ
− up
⎢
⎥
⎦
Δ %
⎛
⎜
⎜
⎝
⎞
⎟
⎟
⎠
Vdesired − Vo,set
Where
Δ% =
× 100
For output voltage: 1.2V to 12V
Vo, set
511
⎡
⎤
For example, to trim-up the output voltage of 1.2V
module (KW025A0P/P1-V) by 5% to 1.26V, Rtrim-up is
calculated is as follows:
Rtrim − down
=
− 10 .22 ΚΩ
⎢
⎣
⎥
⎦
Δ%
⎛
⎜
⎜
⎝
⎞
Vo,set − Vdesired
Where
⎟
⎟
⎠
Δ% =
×100
Δ% = 5
Vo,set
100
5
⎡
⎤
R trim
=
ΚΩ
− up
For example, to trim-down the output voltage of 2.5V
module (KW020A0G/G1) by 8% to 2.3V, Rtrim-down
is calculated as follows:
⎢
⎣
⎥
⎦
Rtrim −up = 20.0ΚΩ
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.
Δ% = 8
LINEAGE POWER
14
LINEAGEPOWER [ LINEAGE POWER CORPORATION ]
