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Ultra-High-Efficiency White
LED Drivers
Typical Operating Characteristics (continued)
(Circuit of Figure 1; V IN = 3.3V, SETI = IN, MODE = IN, T A = +25 ° C, unless otherwise noted.)
TOTAL EFFICIENCY vs. INPUT VOLTAGE
100
90
80
70
(4mA LED CURRENT )
26.0
25.5
25.0
LED CURRENT vs. INPUT VOLTAGE
26
25
24
LED CURRENT MATCHING
LD1 TO LD8
60
50
8 LEDs
6 LEDs
24.5
23
40
2.5
3.0
3.5
4 LEDs
4.0
4.5
5.0
5.5
24.0
2.5
3.0
3.5
4.0
R SETI = 278k?
4.5 5.0 5.5
22
0
50
100
150
R SETI = 278k?
200 250 300
INPUT VOLTAGE (V)
STARTUP WAVEFORMS
INPUT VOLTAGE (V)
LED CURRENT vs. DPWM DUTY
LD_VOLTAGE (mV)
MAXIMUM LED CURRENT
vs. SETI RESISTANCE
A
B
MAX1984/85/86 toc13
5V
0
4V
2V
25
20
15
THEORETICAL
30
25
THEORETICAL
0
100mA
10
ACTUAL
20
ACTUAL
C
0
5
50kHz DPWM FREQUENCY
15
20mA
D
100 μ s/div
0
0
0
20
40
60
R SETI = 278k?
80 100
10
0
500
1000
1500
2000
A: BITA VOLTAGE, 5V/div
B: OUT VOLTAGE, 2V/div
C: INDUCTOR CURRENT, 100mA/div
D: LD_ CURRENT, 20mA/div
DPWM DUTY (%)
SETI RESISTANCE (k ? )
_______________________________________________________________________________________
7
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