LW020G Ver la hoja de datos (PDF) - Tyco Electronics -> TE Connectivity

Número de pieza

componentes Descripción

Fabricante

LW020G

Single-Output-Series Power Modules: 36 Vdc to 75 Vdc Inputs; 20 W

Tyco Electronics -> TE Connectivity 

LW020 Single-Output-Series Power Modules:

36 Vdc to 75 Vdc Inputs; 20 W

Data Sheet

January 2000

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.

-

Von/off

+

Ion/off

VI(+)

VI(-)

REMOTE

ON/OFF

Figure 14. Remote On/Off Implementation

8-758(C).a

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%:

Radj-down = -c---[--d-----•------(---1--∆---–-%---∆----%------)----–----1-----] – b kΩ

Radj-up =

---------a---------- – b

d • ∆%

kΩ

Device

LW020G

LW020F

LW020A

LW020B

LW020C

a

b

c

d

14.0 51.10 7.02

2.0

14.0 51.10 5.19 2.70

4.02 16.90 2.01

2.0

15.40 15.40 1.58 9.80

21.50 16.90 1.76 12.24

–5% VO Radj-down

75.3 k¾

110.9 k¾

19.3 k¾

246.5 k¾

356.3 k¾

+5% VO Radj-up

88.9 k¾

52.8 k¾

23.3 k¾

16.0 k¾

18.2 k¾

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.

10

Tyco Electonics Corp.

Share Link: