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LT3595
APPLICATIONS INFORMATION
LED string depends on the number of LEDs and can vary
from 0.47μF to 1μF. Refer to Table 2 for proper output
capacitor selection.
Table 2. Recommended Output Capacitor Values (V LED = 3.5V)
Open LED Detection
The LT3595 detects an open LED on any channel and
reports it to the ? O ? P ? E ? N ? L ? E ? D pin. The fault also reports dur-
ing startup until the output voltage and LED current are
# LEDs
3-10
1-2
C OUT (μF)
0.47
1
in regulation. Therefore, it can also be used as a “power
ok” signal.
Programming LED Current
Table 3. Recommended Ceramic Capacitor Manufacturers
The set resistor (R SET in the Block Diagram) controls
Taiyo Yuden
TDK
Murata
Kemet
(408) 573-4150
www.t-yuden.com
(847) 803-6100
www.component.tdk.com
(714) 852-2001
www.murata.com
(408)-986-0424
www.kemet.com
the LED current in all sixteen channels. LED current as
a function of the R SET resistance is shown in the Typical
Performance Characteristics. Common values for LED cur-
rent and their required resistor values are listed in Table 4.
Since resistor error directly translates to LED current error,
precision resistors are preferred (1% is recommended).
The maximum allowed resistor value is 150k.
Table 3 shows a list of several ceramic capacitor manufac-
Table 4. LED Current vs R SET Resistance
turers. Consult the manufacturers for detailed information
on their entire selection of ceramic parts.
R SET (k Ω )
150
75.0
49.9
37.4
30.1
I LED (mA)
10
20
30
40
50
3595f
10
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