CAT3606HV4-T2 Datasheet, PDF (5/12 Pages) ON Semiconductor – 6-Channel Low Noise Charge Pump White LED Driver

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
R_SET (kΩ)
649
2
287
5
102
10
49.9
15
32.4
20
23.7
30
15.4
CAT3606
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 0.2mA.
When the following equation is true on any channel,
the driver turns off the LED channel:
VOUT - V_LED ≤ 1V (LED channel OFF)
Note: The CAT3606 is designed to drive LEDs with
forward voltage greater than 1V and is not compatible
with resistive loads.
The enable lines E¯¯N¯M¯ and ^{¯E¯N¯S¯} allow to turn On or
Off a group of LEDs as shown in Table 2.
Table 2: LED Selection
Control Lines
EN E¯¯N¯M¯ ¯E¯N¯S¯
0X
X
11
1
10
1
11
0
10
0
LED Outputs
Main
Sub
LED1 - LED4 LED5 -LED6
–
–
–
–
ON
–
–
ON
ON
ON
Notes: 1 = logic high (or VIN)
0 = logic low (or GND)
– = LED output OFF
X = don't care
© 2008 SCILLC. All rights reserved.
5
Characteristics subject to change without notice
Doc. No. MD-5009 Rev. D