1.2A White LED Regulating Charge Pump for
Camera Flashes and Movie Lights
Typical Operating Characteristics (continued)
(V IN = 3.6V, circuit of Figure 2, R CS = 0.27 ? , Luxeon LXCL-PWF1 LED, T A = +25 ° C, unless otherwise noted.)
TYPICAL OPERATING WAVEFORMS
225
LED CURRENT vs. TEMPERATURE
1.2
LED CURRENT vs. R CS
IN 1x MODE
MAX1577 toc09
220
1.0
EN1 AND EN2 HIGH
V IN
50mV/div
(AC-COUPLED)
0.8
215
210
0.6
0.4
EN1 HIGH, EN2 LOW
V OUT
50mV/div
(AC-COUPLED)
205
R CS = 0.27 ?
EN1 LOW
0.2
EN1 LOW, EN2 HIGH
V CS
50mV/div
(AC-COUPLED)
EN2 HIGH
200
0
-40
-15
10
35
60
85
0.2
0.4
0.6
0.8
1.0
400ns/div
TEMPERATURE ( ° C)
TYPICAL OPERATING WAVEFORMS
IN 2x MODE
MAX1577 toc10
R CS ( ? )
STARTUP AND SHUTDOWN RESPONSE
MAX1577 toc11
V IN
V OUT
50mV/div
(AC-COUPLED)
50mV/div
(AC-COUPLED)
V EN1,
V EN2
V LED
2V/div
2V/div
0V
V CS
50mV/div
(AC-COUPLED)
I LED
500mA/div
0mA
400ns/div
EFFICIENCY vs. SUPPLY VOLTAGE
400 μ s/div
1200
LED CURRENT vs. PWM DUTY CYCLE
80
WITH PWM DIMMING
DIMMING RESPONSE
MAX1577 toc14
1000
70
25%
V EN1
2V/div
60
800
600
400
50
40
30
50%
75%
V LED
2V/div
0V
200
R CS = 0.27 ?
EN1 PWM
20
10
R CS = 0.27 ?
EN1 PWM
I LED
500mA/div
EN2 HIGH
EN2 HIGH
0
0
0mA
0
20
40
60
80
100
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
100 μ s/div
DUTY CYCLE (%)
SUPPLY VOLTAGE (V)
4
_______________________________________________________________________________________
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