LT3595EUHH-TRPBF Ver la hoja de datos (PDF) - Linear Technology
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LT3595EUHH-TRPBF Datasheet PDF : 16 Pages
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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 (VLED = 3.5V)
# LEDs
COUT (μF)
3-10
0.47
1-2
1
Table 3. Recommended Ceramic Capacitor Manufacturers
Taiyo Yuden
(408) 573-4150
www.t-yuden.com
TDK
(847) 803-6100
www.component.tdk.com
Murata
(714) 852-2001
www.murata.com
Kemet
(408)-986-0424
www.kemet.com
Table 3 shows a list of several ceramic capacitor manufac-
turers. Consult the manufacturers for detailed information
on their entire selection of ceramic parts.
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
in regulation. Therefore, it can also be used as a “power
ok” signal.
Programming LED Current
The set resistor (RSET in the Block Diagram) controls
the LED current in all sixteen channels. LED current as
a function of the RSET 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 4. LED Current vs RSET Resistance
RSET (kΩ)
150
75.0
49.9
37.4
30.1
ILED (mA)
10
20
30
40
50
3595f
10
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