TPS61196
SLVSBG1C –OCTOBER 2012–REVISED FEBRUARY 2013
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DIMMING LINEARITY
DIMMING LINEARITY AT LOW DIMMING DUTY CYCLE
800
16
14
12
10
8
700
600
500
400
300
200
100
0
100 Hz Dimming
100 Hz Dimming
1 kHz Dimming
6
1 kHz Dimming
4
2
0
0
10
20
30
40
50
60
70
80
90 100
0
0.2 0.4 0.6 0.8
1
1.2 1.4 1.6 1.8
2
PWM Dimming Duty Cycle (%)
PWM Dimming Duty Cycle (%)
G003
G004
Figure 4.
Figure 5.
DC LOAD EFFICIENCY
SWITCHING FREQUENCY SETTING
1
0.95
0.9
900
800
700
600
500
400
300
200
100
0
0.85
0.8
0.75
0.7
0.65
0.6
VIN = 24 V, 16 LEDs
VIN = 24 V, 20 LEDs
VIN = 12 V, 16 LEDs
0.55
0.5
0
200 400 600 800 1000 1200 1400 1600 1800 2000
0
50
100 150 200 250 300 350 400 450
Output Current (mA)
Resistance (kΩ)
G001
G005
Figure 6.
Figure 7.
RECOMMENDED MINIMUM HEADROOM VOLTAGE
1000
BOOST SWITCHING WAVEFORM
900
800
700
600
500
400
300
200
100
0
SW
50 V/div
V
(AC)
OUT
200 mV/div
Inductor
Current
1 A/div
0
50
100 150 200 250 300 350 400 450
LED Current (mA)
4 µs/div
G006
G007
Figure 8.
Figure 9.
8
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