Datasheet
DUTY CYCLE (%)
I
LED
(A)
1.0
0.8
0.6
0.4
0.2
0.0
0 20 40 60 80 100
100 Hz
500 Hz
I
CSH
(éA)
I
LED
(A)
1.0
0.8
0.6
0.4
0.2
0.0
0 20 40 60 80 100
V
IN
(V)
I
LED
(A)
1.00
0.99
0.98
0.97
0.96
5 10 15 20 25 30
V
IN
(V)
I
LED
(A)
1.05
1.03
1.01
0.99
0.97
0 16 32 48 64 80
V
IN
(V)
EFFICIENCY (%)
100
95
90
85
80
10 15 20 25 30
V
IN
(V)
EFFICIENCY (%)
100
95
90
85
80
75
70
0 16 32 48 64 80
LM3429, LM3429-Q1
SNVS616G –APRIL 2009–REVISED MAY 2013
www.ti.com
Typical Performance Characteristics
T
A
=+25°C and V
IN
= 14V unless otherwise specified
Boost Efficiency vs. Input Voltage Buck-Boost Efficiency vs. Input Voltage
V
O
= 32V (9 LEDs)
(1)
V
O
= 20V (6 LEDs)
(2)
Figure 3. Figure 4.
Boost LED Current vs. Input Voltage Buck-boost LED Current vs. Input Voltage
V
O
= 32V (9 LEDs)
(1)
V
O
= 20V (6 LEDs)
(2)
Figure 5. Figure 6.
Analog Dimming PWM Dimming
V
O
= 20V (6 LEDs)
(2)
V
O
= 20V (6 LEDs)
(2)
Figure 7. Figure 8.
(1) The measurements were made using the standard boost evaluation board from AN-1986 (SNVA404).
(2) The measurements were made using the standard buck-boost evaluation board from AN-1985 (SNVA403).
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