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LT3465/LT3465A
APPLICATIO S I FOR ATIO
Soft-Start (LT3465)
The LT3465 has an internal soft-start circuit to limit the
inductors, which is usually the case for this application,
the peak inrush current can be simplified as follows:
? exp ? – ? ?
input current during circuit start-up. The circuit start-up
waveforms are shown in Figure 5.
I P =
V IN – 0 . 6
L ? ω
? α π ?
? ω 2 ?
Table 3 gives inrush peak currents for some component
selections.
I IN 50mA/DIV
V OUT 5V/DIV
V FB 100mV/DIV
Table 3. Inrush Peak Current
V IN (V) r ( ? )
5 0.5
L ( μ H)
22
C ( μ F)
0.22
I P (A)
0.38
CTRL 5V/DIV
5
0.5
22
1
0.70
V IN = 3.6V
4 LEDs, 20mA
L = 22 μ H
C = 0.22 μ F
200 μ s/DIV
3465 F05
3.6
5
0.5
0.5
22
33
0.22
1
0.26
0.60
Figure 5. Start-Up Waveforms
Inrush Current
The LT3465 and LT3465A have a built-in Schottky diode.
When supply voltage is applied to the V IN pin, the voltage
difference between V IN and V OUT generates inrush current
flowing from input through the inductor and the Schottky
diode to charge the output capacitor to V IN . The maximum
current the Schottky diode in the LT3465 and LT3465A
can sustain is 1A. The selection of inductor and capacitor
value should ensure the peak of the inrush current to be
below 1A. The peak inrush current can be calculated
as follows:
LED Current and Dimming Control
The LED current is controlled by the feedback resistor (R1
in Figure 1) and the feedback reference voltage.
I LED = V FB /R FB
The CTRL pin controls the feedback reference voltage as
shown in the Typical Performance Characteristics. For
CTRL higher than 1.8V, the feedback reference is 200mV,
which results in full LED current. CTRL pin can be used as
dimming control when CTRL voltage is between 200mV to
1.5V. In order to have accurate LED current, precision
resistors are preferred (1% is recommended). The for-
mula and table for R FB selection are shown below.
R FB = 200mV/I LED-Full (1)
? ? ω
? α ? ? ?
? α ? ? ?
? exp ? – ? arctan ? ? ? ? sin ? arctan ? ? ?
( )
r + 1 . 5
I P =
α =
ω =
V IN – 0 . 6
L ? ω
r + 1 . 5
2 ? L
1
–
L ? C
4 ? L 2
2
? ?
? α ? ω ? ? ? ? ω ? ?
Table 4. R FB Resistor Value Selection
FULL I LED (mA) R1 ( ? )
5 40.0
10 20.0
15 13.3
20 10.0
The filtered PWM signal can be considered to be an
adjustable DC voltage. It can be used to adjust the CTRL
where L is the inductance, r is the resistance of the
inductor and C is the output capacitance. For low DCR
voltage source in dimming control. The circuit is shown in
Figure 6. The corner frequency of R1 and C1 should be
3465afa
9
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