Data Sheet
September 9, 2008
KW0006-010 Series Power Modules:
36 – 75Vdc Input; 3.3 to 5.0Vdc Output; 6 to 10A Output Current
Feature Descriptions
(continued)
OVP pull-down circuit is required. The OVP pull-down
circuit will also provide significantly lower peak output
over-voltages for applications that are particularly
sensitive to over-voltage stress. Please contact your
local Lineage Power sales representative for further
information on the external OVP pull-down circuit.
⎡
511
⎤
R
trim
−
down
= ⎢
−
10 .22
⎥ ΚΩ
⎣
8
⎦
R
trim
−
down
=
53 . 655
ΚΩ
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 trimming the output voltage higher:
Over-Current 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 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 current during hiccup is < 1A.
⎡
5.11
×
V
o
,
set
×
(100
+ Δ
%) 511
⎤
−
−
10 .22
⎥ ΚΩ
R
trim
−
up
= ⎢
Δ
%
1.225
× Δ
%
⎣
⎦
Where
Δ
%
= ⎛
V
o
,
set
−
V
desired
⎜
⎜
V
o
,
set
⎝
⎞
⎟ ×
100
⎟
⎠
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.
V
IN
(+)
V
O
(+)
R
trim-up
ON/OFF
V
O
TRIM
R
trim-down
V
IN
(-)
V
O
(-)
LOAD
For example, to trim-up the output voltage of 3.3V
module (KW010A0F/F1) by 6% to 3.498V, R
trim-up
is
calculated is as follows:
Δ
%
=
6
⎡
5 .11
×
3 .3
×
(100
+
6 ) 511
⎤
R
trim
−
up
= ⎢
−
−
10 . 22
⎥ ΚΩ
1 . 225
×
6
6
⎣
⎦
R
trim
−
up
=
147 .8
ΚΩ
The voltage between the V
O
(+) and V
O
(–) 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 = V
o,set
x
I
o,max
).
Figure 18. Circuit Configuration to Trim Output
Voltage.
Connecting an external resistor (R
trim-down
) between the
TRIM pin and the V
O
(-) (or Sense(-)) pin decreases the
output voltage set point. To maintain set point
accuracy, the trim resistor tolerance should be ±1.0%.
The following equation determines the required
external resistor value to obtain a percentage output
voltage change of
Δ%
For trimming the output voltage lower:
⎡
511
⎤
R
trim
−
down
= ⎢
−
10 . 22
⎥ ΚΩ
⎣ Δ
%
⎦
Where
Δ
%
= ⎛
V
o
,
set
−
V
desired
⎜
⎜
V
o
,
set
⎝
⎞
⎟ ×
100
⎟
⎠
For example, to trim-down the output voltage of 3.3V
module (KW010A0F/F1) by 8% to 3.036V, R
trim-down
is
calculated as follows:
Δ
%
=
8
LINEAGE
POWER
9
LINEAGEPOWER [ LINEAGE POWER CORPORATION ]
