RT9273 데이터 시트보기 (PDF) - Richtek Technology
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RT9273 Datasheet PDF : 14 Pages
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Preliminary
RT9273
Typical Operating Characteristics
Efficiency vs. Input Voltage
09.09
0.889
0.888 ILED = 20mA
0.887
0.886
ILED = 10mA
0.885
ILED = 15mA
0.884
0.883
0.882
0.881
08.08
3
Driving 2LEDs
L = 4.7uH
3.15 3.3 3.45 3.6 3.75 3.9 4.05 4.2 4.35 4.5
Input Voltage (V)
Efficiency vs. Input Voltage
909%0
898%9
888%8
878%7
868%6
858%5
ILED = 20mA
848%4
838%3 ILED = 10mA
ILED = 15mA
828%2
818%1
808%0
3
Driving 3LEDs
L = 4.7uH
3.15 3.3 3.45 3.6 3.75 3.9 4.05 4.2 4.35 4.5
Input Voltage (V)
Efficiency vs. Input Voltage
09.09
0.888
ILED = 20mA
0.886
0.884
ILED = 10mA
0.882
08.08
0.7788
0.7766 ILED = 1mA
0.7744
0.7722
3
Driving OLED
L = 4.7uH, VOUT = 8.5V
3.15 3.3 3.45 3.6 3.75 3.9 4.05 4.2 4.35 4.5
Input Voltage (V)
Efficiency vs. Temperature
909%0
898%9
Driving OLED = 20mA
888%8
878%7
Driving 2LEDs
868%6
858%5
848%4
838%3
828%2
-40 -30 -20 -10 0
VIN = 3.4V
10 20 30 40 50 60 70 80 90
Temperature (°C)
Efficiency vs. Input Voltage
0.9922
ILED = 10mA
09.90
0.8888
0.8866 ILED = 20mA
0.8844
0.8822
08.80
0.7788
0.7766
0.7744 ILED = 1mA
0.7722
07.70
Driving OLED
L = 4.7uH, VOUT = 12V
3 3.15 3.3 3.45 3.6 3.75 3.9 4.05 4.2 4.35 4.5
Input Voltage (V)
Feedback Voltage vs. Temperature
350
340
330
320
310
Driving 3LEDs
300
Driving OLED
290
280
270
260
VIN = 3.7V
250
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90
Temperature (°C)
DS9273-09 August 2007
www.richtek.com
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