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LT3754
APPLICATIONS INFORMATION
Two external resistors program the maximum IC junction
temperature using a resistor divider from the V REF pin,
as shown in Figure 9. Choose the ratio of R1 and R2 for
the desired junction temperature. Figure 10 shows the
relationship of T SET voltage to junction temperature, and
Table 8 shows commonly used values for R1 and R2.
31
V REF
R2 LT3754
30
T SET
R1
3754 F09
Figure 9. Programming the T SET Pin
950
900
Programming Overvoltage Protection (OVP) level
The LT3754 LED driver provides optimum protection to
the LEDs and the external MOSFET by providing a pro-
grammable maximum regulated output voltage limit using
the OVP SET pin. The Overvoltage Protection (OVP) level
is programmed as:
OVP(MAXIMUM REGULATED V OUT ) = 57 ? OVP SET
If every LED string fails open or the multiple string LED
display becomes disconnected the LT3754 LED driver loop
regulates to the programmed OVP level. The OVP level
should be programmed to a level high enough to regulate
the LED strings but low enough to prevent damage to the
power switch and to minimize the voltage across the LED
pins upon reconnection of the LED strings. Recommended
OVP level is given by:
OVP(RECOMMENDED ) = 1.2 ? (( N ? V F ) + 1V)
850
800
750
V PTAT
where:
N = number of LEDs in each string,
JUNCTION TEMPERATURE (°C)
For OVP = 49.2V, OVP SET =
= 0.863V
700
650
600
550
500
0 25 50 75 100 125 150
3754 F10
Figure 10. Programing the T SET Pin Threshold
Table 7. Resistor Values to Program Maximum IC Junction
Temperature (V REF (Typical) = 1.485V)
T J (°C) R1 (k) R2 (k) T SET (V)
100 24.9 20 0.824
115 28.0 20 0.866
V F = maximum LED forward voltage drop
and the scaling factor of 1.2 accounts for variation in the
generation of OVP from OVP SET pin voltage and start-up
logic requirements.
Example: For a converter operating with 10 LEDs per string
at a maximum forward voltage of 4V per LED, the OVP
level should be programmed to:
OVP(RECOMMENDED) = 1.2 ? ( (10 ? 4) + 1V ) = 49.2V
49.2
57
The OVP SET pin voltage can be generated using a resistor
divider from the REF pin.
130
30.9
20
0.902
3754fc
20
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