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RT8577 Datasheet(PDF) 7 Page - Richtek Technology Corporation

Part # RT8577
Description  High Voltage 4-CH LED Driver
PDF  12 Pages
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Manufacturer  RICHTEK [Richtek Technology Corporation]
Direct Link  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

RT8577 Datasheet(HTML) 7 Page - Richtek Technology Corporation

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7
DS8577-00 November 2011
www.richtek.com
RT8577
LED Current vs. Input Voltage
60
80
100
120
140
160
8
1012
1416
1820
2224
2628
Input Voltage (V)
Typical Operating Characteristics
Efficiency vs. Input Voltage
70
75
80
85
90
95
100
8
1012
1416
18
2022
2426
28
Input Voltage (V)
96LEDs, RISET = 9.1k
Ω
LED Current vs. PWM Duty Cycle
0
20
40
60
80
100
120
0
1020
3040
5060
7080
90 100
PWM Duty Cycle (%)
VIN = 12V, 96LEDs, RISET = 9.1k
Ω
PWM = 200Hz
PWM = 1kHz
PWM = 10kHz
96LEDs, RISET = 9.1k
Ω
LED1
LED2
LED3
LED4
Power On from VIN
Time (5ms/Div)
VIN
(5V/Div)
DRV
(5V/Div)
IIN
(1A/Div)
VIN = 12V, CSS = 0.1
μF,
96LEDs, RISET = 18.2k
Ω
Power On from EN
Time (5ms/Div)
VEN
(2V/Div)
DRV
(5V/Div)
IIN
(1A/Div)
VIN = 12V, CSS = 0.1
μF,
96LEDs, RISET = 18.2k
Ω
Power On from PWM
Time (5ms/Div)
PWM
(2V/Div)
DRV
(5V/Div)
IIN
(1A/Div)
VIN = 12V, CSS = 0.1
μF,
96LEDs, RISET = 18.2k
Ω



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