CAT3606

5

Doc. No. MD-5009 Rev. C

Characteristics subject to change without notice

LED CURRENT SETTING

The LED current is set by the external resistor RSET

connected between the RSET pin and ground. Table

1 lists various LED currents and the associated RSET

resistor value for standard 1% precision surface

mount resistors.

Table 1. RSET Resistor Selection

LED Current (mA)

1

649

2

287

5

102

10

49.9

15

32.4

20

23.7

30

15.4

The enable lines ENM

¯¯¯¯ and ENS

¯¯¯¯ allow to turn On or

Off a group of LEDs as shown in Table 2.

Table 2: LED Selection

Control Lines

LED Outputs

EN

ENM

¯¯¯¯

ENS

¯¯¯¯

Main

LED1 - LED4

Sub

LED5 -LED6

0

X

X

–

–

1

1

1

–

–

1

0

1

ON

–

1

1

0

–

ON

1

0

0

ON

ON

Notes: 1 = logic high (or VIN)

0 = logic low (or GND)

– = LED output OFF

X = don't care

The unused LED channels can also be turned off by

connecting the respective LED pins to VOUT. In which

case, the corresponding LED driver is disabled and

the typical LED

When the following equation is true on any channel,

the driver turns off the LED channel:

Note: The CAT3606 is designed to drive LEDs with

forward voltage greater than 1V and is not compatible

with resistive loads.