MAX1984ETP 데이터 시트보기 (PDF) - Maxim Integrated
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MAX1984ETP Datasheet PDF : 17 Pages
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Ultra-High-Efficiency White
LED Drivers
Typical Operating Characteristics (continued)
(Circuit of Figure 1; VIN = 3.3V, SETI = IN, MODE = IN, TA = +25°C, unless otherwise noted.)
TOTAL EFFICIENCY vs. INPUT VOLTAGE
(4mA LED CURRENT )
100
90
80
70
60
8 LEDs
50
6 LEDs
4 LEDs
40
2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
LED CURRENT vs. INPUT VOLTAGE
26.0
25.5
25.0
24.5
RSETI = 278kΩ
24.0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
STARTUP WAVEFORMS
5V MAX1984/85/86 toc13
A
0
4V
B
2V
0
100mA
C
0
D
100µs/div
A: BITA VOLTAGE, 5V/div
B: OUT VOLTAGE, 2V/div
C: INDUCTOR CURRENT, 100mA/div
D: LD_ CURRENT, 20mA/div
20mA
0
LED CURRENT vs. DPWM DUTY
25
20
15
10
5
0
0
THEORETICAL
ACTUAL
50kHz DPWM FREQUENCY
RSETI = 278kΩ
20
40
60
80 100
DPWM DUTY (%)
LED CURRENT MATCHING
26
25
24
LD1 TO LD8
23
22
0
RSETI = 278kΩ
50 100 150 200 250 300
LD_VOLTAGE (mV)
MAXIMUM LED CURRENT
vs. SETI RESISTANCE
30
THEORETICAL
25
20
ACTUAL
15
10
0
500
1000
1500
2000
SETI RESISTANCE (kΩ)
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