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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  11 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
5
Doc. No. 5008, Rev. I
© 2005 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
s
e
n
i
L
l
o
r
t
n
o
Cs
t
u
p
t
u
O
D
E
L
2
R
T
C1
R
T
C0
R
T
C4
D
E
L3
D
E
L2
D
E
L1
D
E
L
00
0
-
-
-
N
O
00
1
-
-
N
O-
01
0
-
N
O-
-
01
1
N
O-
-
-
10
0
-
-
N
ON
O
10
1
-
N
ON
ON
O
11
0
N
ON
ON
ON
O
11
1
-
-
-
-
Table 2: LED Selection
Notes: 1 = logic high (or VIN)
0 = logic low (or GND)
- = LED output OFF
SHORT CIRCUIT DETECT/DISABLE
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 20
µA.
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.
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 associ-
ated RSET resistor value for standard 1% precision
surface mount resistors.
)
A
m
(
t
n
e
r
r
u
C
D
E
LR
T
E
S
k
(
Ω
Ω
Ω
Ω
Ω)
19
4
6
27
8
2
52
0
1
0
19
.
9
4
5
14
.
2
3
0
27
.
3
2
0
34
.
5
1
Table 1. RSET Resistor Selection
The digital control lines CTR0, CTR1 adn CTR2
allow to turn On or Off a combition of LEDs as
shown in Table 2.



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