MAX8901B 데이터 시트보기 (PDF) - Maxim Integrated
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MAX8901B
Maxim Integrated
MAX8901B Datasheet PDF : 14 Pages
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MAX8901A/MAX8901B
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.)
LED AND BOOST EFFICIENCY
vs. INPUT VOLTAGE
95
BOOST
90
LED
85
80
75
70
2
6WLEDs,
INDUCTOR: TOKO A915AY-220M,
DIODE: CENTRAL SEMI CMDSH05-4
3
4
5
6
INPUT VOLTAGE (V)
IN CURRENT (IIN)
vs. SUPPLY VOLTAGE
800
700
MAX8901B
600
MAX8901A
500
400
300
200
100
0
2
3
4
5
6
7
SUPPLY VOLTAGE (V)
SWITCHING WAVEFORMS
MAX8901A/B toc9
VI
50mV/div
VIN
AC-COUPLED
VOUT
VLX
10V/div
0V
100mV/div
VOUT
AC-COUPLED
ILEDs
ILX
100mA/div
1μs/div
VLX
0mA
INPUT OVERVOLTAGE
PROTECTION RESPONSE
MAX8901A/B toc10
6.4V
1V/div
5.4V
(AC-COUPLED)
20ms/div
10V/div
0V
20mA/div
0mA
20mA/div
0V
VON
VOUT
ISUPPLY
ILEDs
STARTUP AND SHUTDOWN
RESPONSE (MAX8901A)
MAX8901A/B toc11
C2 = 0.1μF 2V/div
0V
10ms/div
10V/div
0V
100mA/div
0mA
20mA/div
0mA
VON
VOUT
ISUPPLY
ILEDs
www.maximintegrated.com
STARTUP AND SHUTDOWN
RESPONSE (MAX8901B)
MAX8901A/B toc12
2V/div
0V
10ms/div
10V/div
0V
100mA/div
0mA
20mA/div
0mA
Maxim Integrated | 5
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