MAX8901B(2007) 데이터 시트보기 (PDF) - Maxim Integrated
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MAX8901B
(Rev.:2007)
(Rev.:2007)
Maxim Integrated
MAX8901B Datasheet PDF : 15 Pages
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Highest Efficiency Supply for 2 to 6
Series WLEDs in a 2mm x 2mm TDFN Package
Typical Operating Characteristics (continued)
(Circuit of Figure 5, ILED = 24.75mA, VIN = VON = 3.6V, C1 = 1µF, C2 = 1µF, TA = +25°C, unless otherwise noted.)
PWM DIMMING RESPONSE
(MAX8901A)
MAX8901A/B toc13
VON
D = 90%
VIN
D = 10%
2V/div
0V
50mV/div
(AC-COUPLED)
VCS
500mV/div
0V
VOUT
20mV/div
fON_PWM = 100kHz, DUTY 0V
CYCLE CHANGE: 90% TO
10%, C2 = 0.1μF
20mA/div
ILEDs
0mA
4ms/div
LED CURRENT vs. PWM
DIMMING (MAX8901A)
30
25
20
15
10
5
RCS = 20Ω,
fPWM = 100kHz
0
0
20
40
60
80
100
PWM DUTY CYCLE (%)
SERIAL PULSE DIMMING
RESPONSE (MAX8901B)
MAX8901A/B toc14
2V/div
VON
0V
VIN
50mV/div
(AC-COUPLED)
VCS
1V/div
0V
VOUT
20mV/div
0V
ILEDs
20mA/div
0mA
10ms/div
501.0
500.8
500.6
500.4
500.2
500.0
499.8
499.6
499.4
0
VCS vs. LED CURRENT STEP
(MAX8901B)
ILED = 24.75mA
ILED = 0.75mA
5 10 15 20 25 30 35
LED CURRENT STEP
MAXIMUM LED CURRENT
vs. TEMPERATURE (MAX8901B)
25.0
MINIMUM LED CURRENT
vs. TEMPERATURE (MAX8901B)
750
24.8
745
24.6
740
24.4
735
24.2
24.0
-40 -15 10
35
60
85
TEMPERATURE (°C)
730
-40 -15
10
35
60
85
TEMPERATURE (°C)
6 _______________________________________________________________________________________
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