MAX1577YETA 查看數據表（PDF） - Maxim Integrated
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MAX1577YETA
Maxim Integrated
MAX1577YETA Datasheet PDF : 11 Pages
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1.2A White LED Regulating Charge Pump for
Camera Flashes and Movie Lights
Typical Operating Characteristics (continued)
(VIN = 3.6V, circuit of Figure 2, RCS = 0.27Ω, Luxeon LXCL-PWF1 LED, TA = +25°C, unless otherwise noted.)
LED CURRENT vs. TEMPERATURE
225
220
215
210
205 RCS = 0.27Ω
EN1 LOW
EN2 HIGH
200
-40 -15
10
35
60
85
TEMPERATURE (°C)
LED CURRENT vs. RCS
1.2
1.0
EN1 AND EN2 HIGH
0.8
0.6
EN1 HIGH, EN2 LOW
0.4
EN1 LOW, EN2 HIGH
0.2
0
0.2
0.4
0.6
0.8
RCS (Ω)
TYPICAL OPERATING WAVEFORMS
IN 1x MODE
MAX1577 toc09
VIN
50mV/div
(AC-COUPLED)
50mV/div
VOUT
(AC-COUPLED)
VCS
50mV/div
(AC-COUPLED)
1.0
400ns/div
TYPICAL OPERATING WAVEFORMS
IN 2x MODE
MAX1577 toc10
STARTUP AND SHUTDOWN RESPONSE
MAX1577 toc11
VIN
50mV/div
(AC-COUPLED)
VEN1,
VEN2
2V/div
VOUT
VCS
400ns/div
LED CURRENT vs. PWM DUTY CYCLE
1200
1000
800
600
400
200
0
0
RCS = 0.27Ω
EN1 PWM
EN2 HIGH
20
40
60
80
100
DUTY CYCLE (%)
50mV/div
(AC-COUPLED)
VLED
50mV/div
(AC-COUPLED)
ILED
EFFICIENCY vs. SUPPLY VOLTAGE
WITH PWM DIMMING
80
70
25%
60
50
40
50%
30
75%
20
RCS = 0.27Ω
10
EN1 PWM
EN2 HIGH
0
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
SUPPLY VOLTAGE (V)
400µs/div
2V/div
0V
500mA/div
0mA
DIMMING RESPONSE
MAX1577 toc14
VEN1
2V/div
2V/div
VLED
0V
ILED
500mA/div
0mA
100µs/div
4 _______________________________________________________________________________________
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