RT9272 Просмотр технического описания (PDF) - Richtek Technology
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RT9272 Datasheet PDF : 11 Pages
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Preliminary
RT9272
SP Voltage vs. Input Voltage
1.4
1.2
VIH
1
VIL
0.8
0.6
0.4
0.2
0
2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5
Input Voltage (V)
Dimming Control for 3LEDs
18
VIN = 3.7V, ILED = 20mA
16
14
12
10
8
1kHz
6
500Hz
200Hz
4
100Hz
2
0
0.2
0.3
0.4
0.5
0.6
0.7
0.8
Duty (%)
Dimming Operation for 3LEDs
Dimming Control for 4LEDs
18
VIN = 3.7V, ILED = 20mA
16
14
12
10
8
6
100kHz
4
200Hz
500Hz
2
1kHz
0
20
30
40
50
60
70
80
Duty (%)
Dimming Control for 2LEDs
20
VIN = 3.7V, ILED = 20mA
18
16
14
12
10
8
1kHz
500Hz
6
200Hz
4
100Hz
2
0
0.2
0.3
0.4
0.5
0.6
0.7
0.8
Duty (%)
Dimming Operation for 3LEDs
EN (2V/Div)
VOUT (5V/Div)
EN (2V/Div)
VOUT (5V/Div)
ILED (10mA/Div)
VIN = 3.7V, f = 100Hz, Duty = 50%
Time (4ms/Div)
DS9272-09 August 2007
ILED (10mA/Div)
VIN = 3.7V, f = 1kHz, Duty = 50%
Time (400μs/Div)
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