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LT3596
APPLICATIONS INFORMATION
V IN
R2
R1
EN/UVLO
LT3596
LED Current Dimming
The LT3596 has two different types of dimming control.
The LED current is dimmed using the CTRL n pin or the
PWM n pin.
1.51V
3596 F02
Figure 2. EN/UVLO Control
In UVLO an internal 5.1μA (typical) pull-down current
source is connected to the pin for programmable UVLO
hysteresis. The hysteresis is set according to the follow-
ing equation:
V UVLO(HYST) = 5.1μA ? R2
Care must be taken if too much hysteresis is programmed,
the pin voltage might drop too far and cause the current
source to saturate.
Once the EN/UVLO pin goes below 0.4V, the part enters
shutdown.
For some applications, a variable DC voltage that adjusts
the LED current is the preferred method for brightness
control. In this case, the CTRL n pin is modulated to set
the LED dimming. As the CTRL n pin voltage rises from
0V to 1V, the LED current increases from 0mA to the
maximum programmed LED current in a linear fashion
(see Figure 4). As the CTRL n pin increases beyond 1V,
the maximum programmed LED current is maintained.
If this type of dimming control is not desired, the CTRL n
pin can be connected to V REF .
100
80
60
40
Programming Maximum LED Current
Maximum LED current is programmed by placing a resistor
(R ISET n ) between the I SET n pin and ground. R ISET n values
between 20k and 100k can be chosen to set the maximum
LED current between 100mA and 20mA respectively.
20
0
0
25
50
R ISET n (k )
75
100
3596 F03
The LED current is programmed according to the follow-
ing equation:
Figure 3. R ISET n Value for LED Current
I LED 1-3 = 1 V ?
2000
R ISET n
100
R ISETn = 20k
where R ISET n is in kΩ and I LED n is in mA. See Table 5 and
Figure 3 for resistor values and corresponding programmed
LED current.
75
50
Table 5. R ISET n Value for LED Current
R ISET n VALUE (kΩ)
20
LED CURRENT (mA)
100
25
24.9
80
0
0
0.25
0.5
0.75
1
1.25
1.5
33.2
49.9
100
60
40
20
CTRLn VOLTAGE (V)
3596 F04
Figure 4. LED Current vs CTRL n Voltage
3596fa
  
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