LC/LW010- and LC/LW015-Series Power Modules:
18 Vdc to 36 Vdc or 36 Vdc to 75 Vdc Inputs, 10 W and 15 W
Data Sheet
March 27, 2008
Feature Descriptions (continued)
G
H
K
L
Lx010, 5A
5110
10,000
10,000
5110
2050
5110
5110
2050
2050
2.5
9.5
2.5
2.5
Output Voltage Adjustment (Optional on
Single-Output Units)
Lx010, 5B
Lx010, 5C
NA
2.5
Output voltage set-point adjustment allows the user to
increase or decrease the output voltage set point of a
module. This is accomplished by connecting an exter-
nal resistor between the TRIM pin and either the VO(+)
or VO(–) pins. With an external resistor between the
TRIM and VO(+) pins (Radj-down), the output voltage set
point (VO, adj) decreases (see Figure 39). The following
equation determines the required external resistor
value to obtain an output voltage change from VO, nom
to VO, adj:
Lx010, 5D
Lx010, 5F
0.76
0.75
1.23
2.5
5110
The combination of the output voltage adjustment
and the output voltage tolerance cannot exceed 110%
(125% for the D) of the nominal output voltage between
the VO(+) and VO(–) terminals.
VI(+)
VI(-)
VO(+)
(VO, adj – L)G
(VO, nom – VO, adj
Radj-down
=
– H Ω
---------------------------------------
)
RLOAD
TRIM
VO(-)
where Radj-down is the resistance value connected
between TRIM and VO(+), and G, H, and L are defined
in the following table.
Radj-up
8-715(C).d
VI(+)
VI(–)
VO(+)
Figure 40. Circuit Configuration to Increase Output
Voltage
Radj-down
RLOAD
TRIM
VO(-)
The L-Series power modules have a fixed current-limit
set point. Therefore, as the output voltage is adjusted
down, the available output power is reduced. In addi-
tion, the minimum output current is a function of the
output voltage. As the output voltage is adjusted down,
the minimum required output current can increase
(i.e., minimum power is constant).
8-715(C).e
Figure 39. Circuit Configuration to Decrease
Output Voltage
Synchronization (Optional)
With an external resistor connected between the TRIM
and VO(–) pins (Radj-up), the output voltage set point
(VO, adj) increases (see Figure 40). The following equa-
tion determines the required external resistor value to
obtain an output voltage from VO, nom to VO, adj:
With external circuitry, the unit is capable of synchroni-
zation from an independent time base with a switching
rate of 256 kHz. Other frequencies may be available;
please consult the factory for application guidelines
and/or a description of the external circuit needed to
use this feature.
GL
⎛
⎝
⎞
Radj-up
=
---------------------------------------- – H Ω
⎠
[(VO, adj – L) – K]
where Radj-up is the resistance value connected
between TRIM and VO (–), and the values of G, H, K,
and L are shown in the following table:
16
Lineage Power
LINEAGEPOWER [ LINEAGE POWER CORPORATION ]
