Datasheet

0
1
2
3
4
5
6
7
0 10 20 30 40 50 60 70 80 90 100
DIM DUTY CYCLE (%)
AVERAGE LED CURRENT (A)
59
59.2
59.4
59.6
59.8
60
60.2
60.4
60.6
60.8
61
-40 -20 0 20 40 60 80
AMBIENT TEMPERATURE
(°C)
V
SENSE
(mV)
LM3434
SNVS619B –MARCH 2010–REVISED MAY 2013 www.ti.com
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
V
SENSE
vs. Temperature Average LED Current vs. DIM Duty Cycle
(ADJ = 1.0V) (30kHz dimming, I
LED
= 6A nominal)
Figure 8. Figure 9.
Startup Waveform Shutdown Waveform
I
LED
= 6A nominal, V
IN
= 3.3V, V
EE
= -12V, V
LED
= 3V, SS = open I
LED
= 6A nominal, V
IN
= 3.3V, V
EE
= -12V, V
LED
= 3V, SS = open
Top trace: EN input, 2V/div, DC Top trace: EN input, 2V/div, DC
Middle trace: V
EE
input current, 2A/div, DC Middle trace: V
EE
input current, 2A/div, DC
Bottom trace: I
LED
, 2A/div, DC Bottom trace: I
LED
, 2A/div, DC
T = 100µs/div T = 100µs/div
Figure 10. Figure 11.
30kHz PWM Dimming Waveform
Showing Inductor Ripple Current
I
LED
= 6A nominal, V
IN
= 3.3V, V
EE
= -12V
Top trace: DIM input, 2V/div, DC
Bottom trace: I
LED
, 2A/div, DC
T = 10µs/div
Figure 12.
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