RT8206A/B
Power On from EN1 (Delay Start)
Power On from EN2
EN2 = REF
PWM Mode
EN1
(5V/Div)
EN2
(5V/Div)
EN2
(5V/Div)
VOUT2
(5V/Div)
IL2
(2A/Div)
VOUT1
(2V/Div)
VOUT2
(2V/Div)
PGOOD2
(5V/Div)
ILOAD = 4A, VIN = 12V,
VIN = 12V, TON = VCC, ENLDO = VIN
TON = VCC, EN1 = GND, EN2 = VCC, ENLDO = VIN
Time (400μs/Div)
Time (1ms/Div)
Power On from EN2 (Delay Start)
Power Off from EN1
EN1 = REF
EN1
(10V/Div)
EN1
(5V/Div)
VOUT1
(5V/Div)
EN2
(5V/Div)
UGATE1
(20V/Div)
VOUT1
(2V/Div)
VOUT2
(2V/Div)
LGATE1
(5V/Div)
VIN = 12V, TON = VCC, ENLDO = VIN
VIN = 12V, TON = VCC, SKIP = VCC, ENLDO = VIN
Time (10ms/Div)
Time (400μs/Div)
VOUT2 Load Transient Response
VOUT1 Load Transient Response
PWM Mode, VIN = 12V
PWM Mode, VIN = 12V
VOUT2_ac-
VOUT1_ac-
coupled
coupled
(50mV/Div)
(50mV/Div)
IL2
IL1
(2A/Div)
(5A/Div)
LGATE2
(5V/Div)
LGATE1
(5V/Div)
TON = VCC, SKIP = VCC, ENLDO = VIN, FB2 = VCC
TON = VCC, SKIP = VCC, ENLDO = VIN, FB1 = VCC
Time (20μs/Div)
Time (20μs/Div)
www.richtek.com
16
DS8206A/B-03 December 2009
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
