RT4503/A
Power On from EN
Power Off from EN
EN
EN
(2V/Div)
(2V/Div)
VOUT
(10V/Div)
COMP
(100mV/Div)
LX
VOUT
(20V/Div)
(10V/Div)
IIN
(200mA/Div)
IIN
(200mA/Div)
VIN = 3.7V
VIN = 3.7V
Time (5ms/Div)
Time (25ms/Div)
PWM Dimming
PWM Dimming
EN
EN
(2V/Div)
(2V/Div)
VOUT
VOUT
(500mV/Div)
(100mV/Div)
FB
FB
(20mV/Div)
(20mV/Div)
ILED
ILED
(10mA/Div)
(10mA/Div)
VIN = 3.7V, F = 50kHz, Duty = 50%
VIN = 3.7V, F = 1kHz, Duty = 50%
Time (250μs/Div)
Time (5μs/Div)
Pulse Dimming
Pulse Dimming
EN
EN
(1V/Div)
(1V/Div)
ILED
(10mA/Div)
ILED
(10mA/Div)
VIN = 3.7V, IOUT = 20mA to zero
Time (5ms/Div)
VIN = 3.7V, IOUT = 20mA to 10mA
Time (5ms/Div)
Copyright 2015 Richtek Technology Corporation. All rights reserved.
©
is a registered trademark of Richtek Technology Corporation.
DS4503/A-03 June 2015
www.richtek.com
9
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
