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LT3597
APPLICATIONS INFORMATION
Undervoltage Lockout (UVLO)
The EN/UVLO can be used to program the input UVLO
threshold by connecting it to a resistor divider from the
V IN pin as shown in Figure 2.
LT3597
V IN
R2
EN/UVLO
Programming Maximum LED Current
Maximum LED current can be programmed by placing a
resistor (R ISET1-3 ) between the ISET1-3 pin and ground.
R ISET1-3 values between 20k and 100k can be chosen to
set the maximum LED current between 100mA and 20mA
respectively.
The LED current is programmed according to the follow-
ing equation:
R1
1.51V
I LED1-3 = 2 ?
1V
R ISET1-3
(mA)
3597 F02
Figure 2. EN/UVLO Control
See Table 5 and Figure 3 for resistor values and corre-
sponding programmed LED current.
Table 5. LED Current Programming
V IN(UVLO) = 1.51V ? ? 1 +
? R2 ?
?
R1 ?
SelectR1andR2accordingtothefollowingequation:
?
In UVLO an internal 5.1μA pull-down current source is con-
nected to the pin for programmable UVLO hysteresis. The
hysteresis can be set according to the following 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 falls below 0.4V, the part enters
into shutdown.
R ISET1-3 VALUE (k?)
20
25
33.3
50
100
100
80
60
40
20
LED CURRENT (mA)
100
80
60
40
20
0
0
25
50
75
100
R SET1-3 (k )
3597 F03
Figure 3. R ISET1-3 Value for LED Current
3597fa
12
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