5

Date: 07/07/04

SP6683 White LEDs Driver for Parallel Configuration

© Copyright 2004 Sipex Corporation

In this application, the bias resistor can be se-

lected by:

of all the white LEDs.

To use SP6683 as a voltage source for fixed

voltage applications, a voltage divider is need to

program the ouput voltage, as shown in figure 12.

The output voltage is set by the ratio of the two

resistors and the feedback control voltage as

shown by:

in this way.

In figure 11, SP6683 was used to drive a 2-wire

white LED module without internal series resis-

selected to regulate the total current of the white

LED module instead of the current of single

LED as in figure 9.

3-wire W-LED module

Anode

FB

GND

Fig 10. 3-wire white LED module

GND

V

OUT

Anode

5

V

FB

Rb

SP6683

Cathode

8

2-wire W-LED module

1

Figure 11. Driving 2-wire white LED module as current

source

OPERATION: Continued

Anode

5

8

SP6683

Cathode

V

OUT

R6

1

R5

1uF

V

FB

2-wire W-LED

module

GND

Figure 12. Driving 2-wire white LED module as

voltage source