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LC010D

Power Modules: 18 Vdc to 36 Vdc or 36 Vdc to 75 Vdc Inputs, 10 W and 15 W

Tyco Electronics 

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

August 1998

Feature Descriptions (continued)

Output Voltage Adjustment (Optional on

Single-Output Units)

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:

= R adj-down

-----(--V----O---,-a---d--j--–-----L---)--G-------

( VO, nom – VO, adj )

–

H

Ω

where Radj-down is the resistance value connected

between TRIM and VO(+), and G, H, and L are defined

in the following table.

VI (+)

VO (+)

TRIM

Radj-down

RLOAD

VI (–)

VO(-)

8-715(C).e

Figure 39. Circuit Configuration to Decrease

Output Voltage

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:

R adj-up

=





------------------G----L------------------

[(VO, adj – L) – K]

– H Ω

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:

G

H

K

L

Lx010, 5A 5110 2050 2.5

2.5

Lx010, 5B 10,000 5110 9.5

2.5

Lx010, 5C 10,000 5110 NA

2.5

Lx010, 5D 5110 2050 0.76 1.23

Lx010, 5F 5110 2050 0.75

2.5

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(+)

VO(+)

TRIM

VI(-)

Radj-up

RLOAD

VO(-)

8-715(C).d

Figure 40. Circuit Configuration to Increase Output

Voltage

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).

Synchronization (Optional)

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.

16

Tyco Electronics Corp.

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