RT9284A Datasheet, PDF (8/14 Pages) Richtek Technology Corporation – Tiny Package, High Performance, Constant Current Switching Regulator for White LED

RT9284A/B
Dimming Operation
4WLEDs, VIN = 3.7V, ILED = 20mA, L = 10μH
EN
(5V/Div)
IIN _(100mA/Div)
(10mA/Div)
ILED
f = 100kHz, Duty = 50%
Time (4μs/Div)
Inrush Current
4WLEDs, VIN = 3.0V, ILED = 20mA, L = 4.7μH
(2V/Div)
EN
(2V/Div)
VIN
(5V/Div)
VOUT
IIN
(100mA/Div)
Time (500μs/Div)
Normal Operation
(5V/Div)
VOUT
VIN
(2V/Div)
(10V/Div)
LX
4WLEDs, VIN = 3.0V
ILED = 20mA, L = 10μH
IIN
(100mA/Div)
Time (400ns/Div)
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8
L = 10μH
(10V/Div)
VOUT
ILX
(500mA/Div)
OCP
LX
(20V/Div)
Time (25μs/Div)
Inrush Current
4WLEDs, VIN = 4.3V, ILED = 20mA, L = 4.7μH
(2V/Div)
EN
(2V/Div)
VIN
VOUT
IIN
(5V/Div)
(100mA/Div)
Time (500μs/Div)
Normal Operation
(5V/Div)
VOUT
VIN
(2V/Div)
(10V/Div)
LX
4WLEDs, VIN = 3.7V
ILED = 20mA, L = 10μH
IIN
(100mA/Div)
Time (400ns/Div)
DS9284A/B-05 August 2007