RT6010
LED Current vs. PWM Duty Cycle
PWM Dimming Response
100
90
80
70
60
50
40
30
20
10
0
ILED1
PWM
(5V/Div)
ILED2
ILED1
(100mA/Div)
ILED2
(100mA/Div)
VIN = 120V, VOUT1 = 100V
31LEDs, VOUT2 = 80V, 25LEDs
PWM = 300Hz, COUT = 0.22μF
VIN = 120V, VOUT1 = VOUT2 = 90V, 56LEDs,
PWM = 300Hz, COUT = 0.22μF, ILED1 = ILED2 = 100mA
0
20
40
60
80
100
Time (50μs/Div)
Duty Cycle (%)
PWM Dimming Response
Non-SPD Function
VIN_AC
(500mV/Div)
PWM
(5V/Div)
ILED1
(100mA/Div)
VIN = 120V, VOUT1 = VOUT2 = 90V, 56LEDs
ILED1
(100mA/Div)
ILED2
(100mA/Div)
ILED2
(100mA/Div)
VIN = 120V, VOUT1 = 100V, 31LEDs
VOUT2 = 80V, 25LEDs, PWM = 300Hz
COUT = 0.22μF, ILED1 = ILED2 = 100mA
IIN
(100mA/Div)
PWM = 300Hz, PWM Duty = 30%
Time (1ms/Div)
Time (50μs/Div)
SPD Function
VIN_AC
(500mV/Div)
ILED1
(100mA/Div)
ILED2
(100mA/Div)
VIN = 120V, VOUT1 = VOUT2 = 90V, 56LEDs
IIN
(100mA/Div)
PWM = 300Hz, PWM Duty = 30%
Time (1ms/Div)
Copyright 2012 Richtek Technology Corporation. All rights reserved.
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is a registered trademark of Richtek Technology Corporation.
www.richtek.com
8
DS6010-00 March 2012
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
