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LT3596
APPLICATIONS INFORMATION
R X
100
R ISETn = 20k
R2
V REF
LT3596
R NTC
R X
R X
R NTC
R NTC
R X
75
CTRLM
3596 F08
R1
(OPTION A TO D)
(8a)
(8b)
(8c)
(8d)
50
25
Figure 8. Programming the CTRLM Pin
V CTRLM = V REF ? ?
LEDcurrentstobecontrolledbytheCTRLMpinvoltage.
The LED current-curve breakpoint and slope versus tem-
perature are defined by the choice of resistor ratios and
use of temperature-dependent resistance in the divider
for the CTRLM pin.
Table 7 shows a list of manufacturers/distributors of NTC
resistors. There are several other manufacturers available.
The chosen supplier should be contacted for more detailed
information.
Table 7. NTC Resistor Manufacturers/Distributors
Murata www.murata.com
TDK Corporation www.tdk.com
Digi-Key www.digikey.com
If an NTC resistor is used to indicate LED temperature, it
is effective only if the resistor is placed as close as pos-
sible to the LED strings. LED derating curves shown by
manufacturers are listed for ambient temperature. The
NTC resistor should have the same ambient temperature
as the LEDs. Since the temperature dependence of an
NTC resistor is nonlinear as a function of temperature, it
is important to obtain its temperature characteristics from
the manufacturer. Hand calculations of the CTRLM voltage
are then performed at each given temperature using the
following equation:
? R 1 ?
? R 1 + R 2 ? ?
This produces a plot of V CTRLM versus temperature. From
this curve, the LED current is found using Figure 9.
Several iterations of resistor value calculations may be
necessary to achieve the desired breakpoint and slope of
the LED current derating curve.
0
0 0.25 0.5 0.75 1 1.25 1.5
CTRLM VOLTAGE (V)
3596 F04
Figure 9. LED Current vs CTRLM Voltage
If calculating the CTRLM voltage at various temperatures
gives a downward slope that is too strong, use alternative
resistor networks (B, C, D in Figure 8). They use tempera-
ture independent resistance to reduce the effects of the
NTC resistor over temperature.
Murata Electronics provides a selection of NTC resistors
with complete data over a wide range of temperatures.
In addition, a software tool is available which allows the
user to select from different resistor networks and NTC
resistor values, and then simulate the exact output volt-
age curve (CTRLM behavior) over temperature. Referred
to as the Murata Chip NTC Thermistor Output Voltage
Simulator, users can log on to www.murata.com and
download the software followed by instructions for creat-
ing an output voltage V OUT (CTRLM) from a specified V CC
supply (V REF ).
The CTRLM pin must be tied to V REF if the temperature
derating function is not desired.
Programming Switching Frequency
The switching frequency of the LT3596 can be programmed
between 200kHz and 1MHz by an external resistor con-
nected between the RT pin and ground. Do not leave this
pin open. See Table 8 and Figure 10 for resistor values
and corresponding frequencies.
Selecting the optimum switching frequency depends on
several factors. Inductor size is reduced with higher fre-
quency, but efficiency drops slightly due to higher switching
3596fa
  
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