TPS61199
SLVSAN3 –DECEMBER 2010
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TYPICAL CHARACTERISTICS
Figure 1 as test circuit, and L = CDRH127/HPNP- 220M, R6 = 41kΩ, unless otherwise noted
DESCRIPTION
FIGURES
Dimming efficiency
Dimming efficiency
Dimming linearity
17LEDs in series; 200Hz dimming frequency;
13LEDs in series; 200Hz dimming frequency;
17LEDs in series; VIN = 12V;
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
Figure 7
Figure 8
Figure 9
Figure 10
Dimming with short on time
Current matching
17LEDs in series; VIN = 12V;
17LEDs in series; VIN = 12V;
Dimming waveform
Dimming waveform
Startup waveform
17LEDs in series; VIN = 12V; 200Hz with 1% duty cycle
17LEDs in series; VIN = 12V; 22kHz with 5% duty cycle
17LEDs in series; VIN = 12V; 200Hz with 50% duty cycle
17LEDs in series; VIN = 12V; 200Hz with 50% duty cycle
Shutdown waveform
100
95
100
95
90
90
85
85
V = 12 V
V = 24 V
V = 24 V
I
I
I
V = 12 V
I
80
80
75
70
75
70
65
60
65
60
55
50
55
50
0
20
40 60
PWM - Duty Cycle - %
80
100
0
20
40 60
PWM - Duty Cycle - %
80
100
Figure 2. Dimming Efficiency
Figure 3. Dimming Efficiency
6
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