lt3595a Linear Technology Corporation, lt3595a Datasheet - Page 10

• Manufacturer Part Number: lt3595a
• Description: 16 Channel Buck Mode Led Driver
• Manufacturer: Linear Technology Corporation

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
Table 3. Recommended Ceramic Capacitor Manufacturers
Taiyo Yuden
TDK
Murata
Kemet
Table 3 shows a list of several ceramic capacitor manufac-
turers. Consult the manufacturers for detailed information
on their entire selection of ceramic parts.
10
# LEDs
3-10
1-2
www.component.tdk.com
www.t-yuden.com
www.murata.com
www.kemet.com
408-573-4150
847-803-6100
770-436-1300
800-533-1992
C
OUT
0.47
1
(μF)
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
in regulation. Therefore, it can also be used as a “power
ok” signal.
Programming LED Current
The set resistor (R
the LED current in all sixteen channels. LED current as
a function of the R
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 R
R
SET
75.0
49.9
37.4
30.1
150
(kΩ)
SET
SET
SET
resistance is shown in the Typical
in the Block Diagram) controls
Resistance
I
LED
10
20
30
40
50
(mA)
3595af