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CAT3604 Scheda tecnica(PDF) 5 Page - Catalyst Semiconductor

Il numero della parte CAT3604
Spiegazioni elettronici  4-Channel Regulated Charge Pump White LED Driver
PDF  12 Pages
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Produttore elettronici  CATALYST [Catalyst Semiconductor]
Homepage  http://www.catalyst-semiconductor.com
Logo CATALYST - Catalyst Semiconductor

CAT3604 Scheda tecnica(HTML) 5 Page - Catalyst Semiconductor

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CAT3604
© Catalyst Semiconductor, Inc.
5
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)
1
649
2
287
5
102
10
49.9
15
32.4
20
23.7
30
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
0
0
0
–
–
–
ON
0
0
1
–
–
ON
–
0
1
0
–
ON
–
–
0
1
1
ON
–
–
–
1
0
0
–
–
ON
ON
1
0
1
–
ON
ON
ON
1
1
0
ON
ON
ON
ON
1
1
1
–
–
–
–
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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