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LT3599
APPLICATIONS INFORMATION
The companies below offer Schottky diodes with high
voltage and current ratings. Standard silicon diodes (PN
junction diodes) should not be used.
The output voltage should be set 10% higher than the
normal LED string operating voltage. Under normal
operation, LED1 to LED4 pin voltages are monitored and
Table 3. Suggested Diodes
MAX
CURRENT
PART (A)
MAX REVERSE
VOLTAGE
(V)
MANUFACTURER
provide feedback information to the converter for output
voltage regulation given the programmed LED current.
The output voltage regulation loop is activated only when
all LEDs are open.
B250A
2
50
Diodes, Inc.
DFLS240
B240A
B350A
B340A
HSM150G
HSM150J
HSM350G
2
2
3
3
1
1
3
40
40
50
40
50
50
50
www.diodes.com
Microsemi
www.microsemi.com
Programming Maximum LED Current
Maximum LED current can be programmed by placing a
resistor between the I SET pin and ground (R ISET ). The I SET
pin resistor can be selected from 11k to 44.2k.
The LED current can be programmed according to the
following equation:
Overvoltage Protection
The LT3599 uses the FB pin to provide overvoltage protec-
tion. A resistor divider is connected between the V O_SW
I LED ≈
1330
R ISET
( Amps ) (CTRL > 1V)
pin and ground (Figure 2). There is an internal PMOS
switch between V OUT and V O_SW , which is controlled by
the PWM signal. The PMOS switch addition prevents the
feedback resistor divider from draining the output capaci-
tor during PWM off-period, allowing for a higher dimming
range without falsely tripping the OPENLED ?ag. It also
reduces the system current in shutdown. This PMOS has
about 1k resistance, so select FB resistor values taking
See Table 4 and Figure 3 for resistor values and corre-
sponding programmed LED current.
LED current can also be adjusted by programming the
CTRL pin voltage.
Table 4. R ISET Value Selection for LED Current
LED CURRENT (mA) RESISTOR ON I SET PIN (k)
30mA 44.2
this resistance into account.
To set the maximum output voltage, select the values
of R1 and R2 (see Figure 2) according to the following
equation:
50mA
99mA
120mA
26.7
13.3
11
V OUT(MAX) = 1.223V ? 1 +
?
?
?
LT3599
R2 ?
R1 ?
V OUT
V O_SW
R2
120
100
80
60
40
20
FB
R1
0
0
20
40
60 80
100 120 140 160
3599 F02
R ISET (k)
3599 F03
Figure 2. Overvoltage Protection Voltage Feedback Connections
Figure 3. R ISET Value Selection for LED Current
3599fe
11
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