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LT3595A
APPLICATIONS INFORMATION
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 LT3595A detects an open LED on any channel and
reports it to the OPENLED 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
770-436-1300
www.murata.com
800-533-1992
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
3595af
10
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