RT8278 Просмотр технического описания (PDF) - Richtek Technology
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Компоненты Описание
производитель
RT8278 Datasheet PDF : 16 Pages
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RT8278
Current Limit vs. Duty Cycle
4.3
3.9
fSW = 2.2MHz
3.5 fSW = 400kHz
3.1
2.7
2.3
1.9
1.5
0
20
40
60
80
100
Duty Cycle (%)
Current Limit vs. Temperature
4.5
4.0
3.5
3.0
2.5
2.0
1.5
-50
VIN = 12V, VOUT = 3.3V, fSW = 2.2MHz
-25
0
25 50 75 100 125
Temperature (°C)
Switching Frequency vs. Temperature
2.4
2.3
2.2
2.1
VOUT
(10mV/Div)
VSW
(10V/Div)
2.0
1.9
1.8
-50 -25
VIN = 12V, VOUT = 3.3V,
lOUT = 0.3A, RRT = 24kΩ
0
25 50 75 100 125
Temperature (°C)
IL
(1A/Div)
Load Transient Response
VIN = 12V, VOUT = 3.3V
lOUT = 0 to 2A, fSW = 2.2MHz
VOUT
(100mV/Div)
VOUT
(100mV/Div)
Output Ripple Voltage
VIN = 12V, VOUT = 3.3V
IOUT = 2A, fSW = 2.2MHz
Time (200ns/Div)
Load Transient Response
IOUT
(1A/Div)
Time (100μs/Div)
DS8278-02 March 2011
IOUT
(1A/Div)
VIN =VIN12=V,1V2VO,UTVO=U3T.3=V3.3V
IOUTI=OU1TA=to1 2toA2, AfS,WfS==22.2.2MMHHzz
Time (100μs/Div)
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