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Notes:

Analog Output Current Control

Pin

Function

-DC Supply

9

+LED

LED Anode Conn.

-DC Supply

10

+LED

LED Anode Conn.

PWM, On/Off

15

+DC Supply

7

-LED LED Cathode Conn.

16

+DC Supply

8

-LED LED Cathode Conn.

Pin

Function

-DC Supply

8

+LED

LED Anode Conn.

PWM, On/Off

14

+DC Supply

7

-LED LED Cathode Conn.

In the second circuit, the input DC/DC has been changed to

the F2506RU. The 4:1 input of the converter allows for wider

input bus levels (in this case 24 VDC). The POL regulator

connected in parallel with the resistor network, will maintain

When using the analog control input, the nominal output

current is equal to:

.

II

x

V

125

NOM

MAX

ADJ

=

The output current of the unit can also be set by

25% to 100% of rated output current). Care must

be taken not to exceed 1.25V on this input, or the

driver may be damaged.

The simple analog circuit at left uses the F2506RW,

a 30W, dual 15V output DC/DC converter. Operating

from an input line of 12 VDC, the converter sets the

input to the LED driver at 30 VDC.

The POL regulator, driven off the same input line

be used to set the output current level of the LED

driver. This level is equal to:

V

RR

R

XV

12

2

ADJ

CTRL

=

+