Datasheet

0 25 50 75 100 125 150
I - Output Current - mA
O
80
82
84
86
88
90
92
94
96
98
100
Efficiency - %
V = 28.6 V,
9 LEDs
O
V = 19 V
BAT
V = 10.8 V
BAT
V = 5 V
BAT
0 25 50 75 100 125 150
I - Output Current - mA
O
80
82
84
86
88
90
92
94
96
98
100
Efficiency - %
V = 19 V
BAT
V = 10.8 V
BAT
V = 5 V
BAT
V = 31.7 V,
10 LEDs
O
TPS61181A
SLVSAN6A –FEBRUARY 2011– REVISED MARCH 2011 www.ti.com
TYPICAL CHARACTERISTICS
Table of Graphs
Description (Reference to application circuit in Figure 15) Figure
DC Load Efficiency V
bat
= 5V, 10.8V, 19V; V
O
=28.6V, 9LEDs; L=10uH Figure 1
DC Load Efficiency V
bat
= 5V, 10.8V, 19V; V
O
=31.7V, 10LEDs; L=10uH Figure 2
PWM Dimming Efficiency V
bat
= 5V, 10.8V and 19V; V
O
=25.5V, 8LEDs; PWM Freq = 1kHz Figure 3
PWM Dimming Efficiency V
bat
= 5V, 10.8V and 19V; V
O
=28.6V, 9LEDs; PWM Freq = 1kHz Figure 4
PWM Dimming Efficiency V
bat
= 5V, 10.8V and 19V; V
O
=31.7V, 10LEDs; PWM Freq = 1kHz Figure 5
PWM Dimming Efficiency V
bat
= 5V, 10.8V and 19V; V
O
=34.8V, 11LEDs; PWM Freq = 1kHz Figure 6
Dimming Linearity V
bat
= 10.8V; V
O
=28.6V, 9LEDs; I
set
= 20μA; PWM Freq = 1kHz Figure 7
Dimming Linearity V
bat
= 10.8V; V
O
=28.6V, 9LEDs; I
set
= 20μA; PWM Freq = 200Hz Figure 8
Output Ripple V
O
=28.6V; I
set
= 20μA; PWM Freq = 200Hz; Duty = 50% Figure 9
Switching Waveform V
bat
= 10.8V; I
set
= 20μA Figure 10
Output Ripple at PWM Dimming V
bat
= 10.8V; I
set
= 20μA; PWM Freq = 200Hz; Duty = 50%; C
O
=4.7μF Figure 11
Short Circuit Protection V
bat
= 10.8V; I
set
= 20μA Figure 12
Open WLED Protection V
bat
= 10.8V; I
set
= 20μA Figure 13
Startup Waveform V
bat
= 10.8V; I
set
= 20μA Figure 14
EFFICIENCY EFFICIENCY
vs vs
OUTPUT CURRENT OUTPUT CURRENT
Figure 1. Figure 2.
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