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LT3474 Datasheet(PDF) 9 Page - Linear Technology

Part # LT3474
Description  Full-Featured LED Driver with 1.5A Switch Current
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT3474 Datasheet(HTML) 9 Page - Linear Technology

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LT3517
9
3517ff
APPLICATIONS INFORMATION
than 1V, the LED current is:
ILED =
VCTRL
10 • RSENSE
(2)
When VCTRL is higher than 1V, the LED current is clamped
to be:
ILED =
100mV
RSENSE
(3)
The LED current programming feature possibly increases
total dimming range by a factor of ten.
The CTRL pin should not be left open (tie to VREF if not
used). The CTRL pin can also be used in conjunction with
a PTC thermistor to provide overtemperature protection
for the LED load.
For a buck or a buck-boost configuration, the output
voltage is typically level-shifted to a signal with respect
to GND, as illustrated in the Figure 4. The output can be
expressed as:
VOUT =
R1
R2
• 1.01V
+ VBE(Q1)
(5)
49.9k
3517 F02
45.3k
2V
VREF
5k
PTC
CTRL
Figure 2
Setting Output Voltage
For a boost application, the output voltage can be set by
selecting the values of R1 and R2 (see Figure 3) according
to the following equation:
VOUT =
R1
R2
+1
⎟ •1.01V
(4)
LT3517
FB
R1
VOUT
R2
3517 F03
Figure 3
LT3517
FB
R1
Q2
+
LED
ARRAY
VOUT
R2
3517 F04
RSENSE
Figure 4
Inductor Selection
The inductor used with the LT3517 should have a satura-
tion current rating of 2A or greater. For buck mode LED
drivers, the inductor value should be chosen to give a
ripple current “ΔI” of ~30% to 40% of the LED current.
In the buck mode, the inductor value can be estimated
using the formula:
LμH
() =
DBUCK •tSW(μs) • VIN –VLED
()
ΔI
DBUCK =
VLED
VIN
(6)
VLED is the voltage across the LED string, VIN is the input
voltage to the converter, and tSW is the switching period.
In the boost configuration, the inductor can be estimated
using the formula:
LμH
() =
DBOOST •tSW(μs) • VIN
ΔI
DBOOST =
VLED –VIN
VLED
(7)


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