SNVS574E – JULY 2008 – REVISED MAY 2013
Typical Performance Characteristics
T A =+25°C and V IN = 14V unless otherwise specified
Boost Efficiency vs. Input Voltage
V O = 32V (9 LEDs) (1)
Buck-Boost Efficiency vs. Input Voltage
V O = 21V (6 LEDs) (2)
100
100
95
90
85
95
90
85
80
75
70
80
10
15
20
25
30
0
16
32
48
64
80
1.010
1.005
1.000
0.995
0.990
V IN (V)
Figure 4.
Boost LED Current vs. Input Voltage
V O = 32V (9 LEDs) (1)
V IN (V)
Figure 5.
Buck-Boost LED Current vs. Input Voltage
V O = 21V (6 LEDs) (2)
1.02
1.01
1.00
0.99
0.98
5
10
15 20
25
30
0
16
32
48
64
80
V IN (V)
Figure 6.
V IN (V)
Figure 7.
Analog Dimming
V O = 21V (6 LEDs); V IN = 24V
(2)
PWM Dimming
V O = 32V (9 LEDs); V IN = 24V
(1)
1.0
1.0
0.8
0.8
0.6
0.6
1 kHz
0.4
0.2
0.4
25 kHz
0.2
0.0
0
20
40
60
80
100
0.8
0
20
40
60
80
100
I CSH ( é A)
Figure 8.
DUTY CYCLE (%)
Figure 9.
(1)
(2)
The measurements were made using the standard boost evaluation board from SNVA416 .
The measurements were made using the standard buck-boost evaluation board from .
8
Copyright ? 2008–2013, Texas Instruments Incorporated
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