Datasheet
0 10 20 30 40 50 60
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
I
IN
(mA)
V
IN
(V)
T
J
=25°C
T
J
=-40°C
T
J
=125°C
0 10 20 30 40 50 60
0
50
100
150
200
250
300
350
400
450
I
LED
(mA)
V
IN
(V)
T
J
=-40°C
T
J
=125°C
T
J
=25°C
4 s/DIV
V
DIM
(2V/DIV)
I
LED
(200mA/DIV)
0 10 20 30 40 50 60
0.0
0.5
1.0
1.5
2.0
2.5
3.0
I
IN
(mA)
V
IN
(V)
T
J
=25°C
T
J
=-40°C
T
J
=125°C
2 s/DIV
V
DIM
(2V/DIV)
I
LED
(200mA/DIV)
2 s/DIV
I
LED
(200mA/DIV)
V
DIM
(2V/DIV)
TPS92551, TPS92551EVM
SNVS805C –MAY 2012–REVISED MAY 2013
www.ti.com
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
Unless otherwise specified, the following conditions apply: V
IN
= 48V, C
IN
is a 2.2µF 100V X7R ceramic capacitor for driving
5–13 power LEDs with I
LED
= 350mA. Single LED forward voltage used is 3.2V. T
A
= 25°C for efficiency curves and
waveforms.
LED Current with PWM Dimming LED Current with PWM Dimming
V
DIM
Rising V
DIM
Falling
Figure 18. Figure 19.
LED Current with PWM Dimming I
IN
vs V
IN
16µs dimming pulse V
DIM
= 0V
Figure 20. Figure 21.
I
IN
vs V
IN
LED = open , DIM = open ILED vs V
IN
6LED
Figure 22. Figure 23.
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