SEP 09, 2005 revised to JUL 17, 2006

Page 6 of 12

www.power-one.com

LOS, LOR, LOK4000 Series Data Sheet

DIN-Rail Mountable AC-DC (DC-DC) Converters

2.10

2.15

2.20

2.25

2.30

2.35

2.40

2.45

Cell voltage [V]

–20

–10

0

10

20

30

40

50 °C

06123a

Table 4: Output Voltage OK signal

Conditions

LOK4001-2RLD

LOK4140-2RLD

LOK4240-2RLD

LOK4740-2RLD

Unit

min

max

min

max

min

max

min

max

setting

4.4

4.8

10.5

11.5

21

23

42

46

V

60

60

60

60

0.6

0.6

0.6

0.6

Auxiliary Functions

Adjustable Output Voltage (R input)

As a standard feature, the LOK units offer adjustable output

voltage by using the control input R. If the R pin is left open-

The R input is referenced to the secondary side of the

converter. Adjustment of the output voltage is possible by

means of either an external resistor or a voltage source.

Depending upon the value of the required output voltage, the

resistor shall be connected

either: Between the R terminal and Vo– to achieve an output

voltage adjustment range of approximately

≈ 4 kΩ • –––––––––

or: Between the R terminal and Vo+ to achieve an output

≈ 4 kΩ • –––––––––––––––––––

R

Vo+

Vo-

+

V

ext

-

4 k

Ω

control

circuit

L

N

R

ext1

R

ext 2

06029

Vo– and R terminal to achieve an output voltage adjustment

≈ –––––––––

Attempting to adjust the output below this range will cause

the converter to shut down (hiccup mode).

Note: Applying an external control voltage >3 V may damage the

converter.

Fig. 6

Voltage setting by a temperature sensor, wiring diagram

+

–

Battery

Vo+

R

Vo–

Temperature

sensor

Sensor

cable

Sensor

wires

+

green

brown

white

Fuse

–

Fig. 7

Float charge voltage for defined temperature coefficients.

Output Voltage OK (D Output)

The D-output is referenced to Vo– and monitors the output

(open-collector circuit). The circuitry works independently of the

input voltage and can therefore be used as battery-low indicator.

Battery Charging/Temperature Sensor

The LOK 4140/4240/4740 are designed to charge lead-acid

batteries. For optimum battery charging and extended life time

of the battery an external temperature sensor may be

connected to the R-input. The sensor should be mounted as

close as possible to one of the poles of the battery.

Depending upon the cell voltage and the temperature coefficient

of the battery, different temperature sensors are available. For

more information please see: Temperature Sensors (Accessory

Products on the Web Site) or contact Power-One.

If no sensor is used, the float charge voltage should be

adjusted with a suitable resistor connected to the R input (see:

Adjustable Output Voltage).

Fig. 5

Output voltage control by means of the R-input