LW020AF datasheet(10/16 Pages) GE

10 / 16 page

Lineage Power

Data Sheet

April 2008

36 Vdc to 75 Vdc Inputs; 20 W

LW020 Single-Output-Series Power Modules:

Feature Descriptions (continued)

Remote On/Off (continued)

The module has internal capacitance to reduce noise at the ON/OFF pin. Additional capacitance is not generally

needed and may degrade the start-up characteristics of the module.

8-758(C).a

Figure 14. Remote On/Off Implementation

Output Voltage Adjustment

Output voltage trim allows the user to increase or decrease the output voltage set point of a module. This is accom-

plished by connecting an external resistor between the TRIM pin and either the VO(+) or VO(–) pins. With an exter-

nal resistor between the TRIM and VO(+) pins (Radj-down), the output voltage set point (VO, adj) decreases. With an

external resistor between the TRIM pin and VO(–) pin (Radj-up), VO, adj increases.

The following equations determine the required external resistor value to obtain an output voltage change of ý%:

The adjusted output voltage cannot exceed 110% of the nominal output voltage between the VO(+) and VO(–) ter-

minal.

The modules have a fixed current-limit set point. Therefore, as the output voltage is adjusted down, the available

output power is reduced. In addition, 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.

Device

–5% VO Radj-down

+5% VO Radj-up

LW020G

14.0

51.10

7.02

2.0

75.3 k¾

88.9 k¾

LW020F

14.0

51.10

5.19

2.70

110.9 k¾

52.8 k¾

LW020A

4.02

16.90

2.01

2.0

19.3 k¾

23.3 k¾

LW020B

15.40

1.58

9.80

246.5 k¾

16.0 k¾

LW020C

21.50

16.90

1.76

12.24

356.3 k¾

18.2 k¾

Ion/off

Von/off

REMOTE

ON/OFF

VI(+)

VI(-)

Radj-down

Δ%

–

() 1

–

•

[]

Δ%

---------------------------------------------------- b

–

Radj-up

• %

------------------- b

–

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