CAT3604 datasheet(5/12 Pages) CATALYST

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CAT3604

Doc. No. MD-5008 Rev. J

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)

RSET (kΩ)

649

287

102

49.9

32.4

23.7

15.4

The digital control lines CTR0, CTR1 adn CTR2 allow to

turn On or Off a combition of LEDs as shown in Table 2.

Table 2: LED Selection

Control Lines

LED Outputs

CTR2 CTR1 CTR0 LED4 LED3

LED2

LED1

–

Notes:

1 = logic high (or VIN)

0 = logic low (or GND)

– = LED output OFF

SHORT CIRCUIT DETECT/DISABLES

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 sink current is only about 20µA. When the

following equation is true on any channel, the driver

turns off the LED channel:

VOUT - VLED ≤ 1V (LED channel OFF)

Note: The CAT3604 is designed to drive LEDs with

forward voltage greater than 1V and is not compatible

with resistive loads.

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