2MHz, High-Brightness LED Drivers with
Integrated MOSFET and High-Side Current Sense
Typical Operating Characteristics (continued)
(V IN = V DIM = 48V, C VCC = 1μF, R SENSE = 0.62 Ω , L = 220μH (connected between IN and CS). Typical values are at T A = +25°C,
unless otherwise noted.)
1.10
NORMALIZED I LED
vs. V IN
500
QUIESCENT CURRENT
vs. V IN
PWM DIMMING
AT 200Hz DUTY CYCLE (10%)
MAX16822A toc06
450
9 LEDs11 LEDs13 LEDs
3 LEDs
1.05
1.00
0.950
5 LEDs 7 LEDs
1 LED
15 LEDs
400
350
300
250
200
150
100
I LED
200mA/div
0
V DIM
5V/div
0
0.90
0 5 10 15 20 25 30 35 40 45 50 55 60 65
50
0
V DIM = 0V
0 5 10 15 20 25 30 35 40 45 50 55 60 65
1ms/div
V IN = 48V
8 LEDs
500
450
400
350
300
250
200
150
100
50
0
V IN (V)
PWM DIMMING
AT 200Hz DUTY CYCLE (90%)
MAX16822A toc07
V IN = 48V
8 LEDs
1ms/div
LED CURRENT
vs. V TEMP_I
I LED
200mA/div
0
V DIM
5V/div
0
V IN (V)
0.5
0.4
0.3
0.2
0.1
0
PWM DIMMING
AT 20kHz DUTY CYCLE (90%)
MAX16822A toc08
10 μ s/div
I LED
vs. TEMPERATURE
V IN = 48V
I LED
200mA/div
0
V DIM
5V/div
0
0
0.4
0.8
1.2
1.6
2.0
2.4
2.8
-40 -25 -10 5 20 35 50 65 80 95 110 125
V TEMP_I (V)
TEMPERATURE ( ° C)
4
_______________________________________________________________________________________
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