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RT9269 Datasheet(PDF) 5 Page - Richtek Technology Corporation

Part # RT9269
Description  Tiny Package, High Efficiency, Constant Current LED Driver
Download  10 Pages
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Manufacturer  RICHTEK [Richtek Technology Corporation]
Direct Link  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

RT9269 Datasheet(HTML) 5 Page - Richtek Technology Corporation

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Preliminary
RT9269
DS9269-01 March 2003
www.richtek.com
5
Typical Operating Characteristics
Efficiency vs. Vin
79
80
81
82
83
84
85
33.5
44.5
55.5
6
VIN(V)
6 LEDs, L = 33
µH
IOUT = 20mA
IOUT = 15mA
Efficiency vs. Input Voltage
79
81
83
85
87
89
2.5
3
3.5
4
4.5
5
5.5
6
Input Voltage (V)
IOUT = 20 mA
IOUT = 15 mA
4 LEDs, L = 47
µH
Frequency vs. VDD
0
100
200
300
400
500
600
01
234
5
6
VDD (V)
FB = GND, TA = 25°C
Efficiency vs. Input Voltage
50
60
70
80
90
100
3.0
3.5
4.0
4.5
5.0
5.5
6.0
Input Voltage (V)
IOUT = 20mA @ VIN > 3.8V
IOUT = 15mA @ VIN > 3.6V
Refer to Application Circuit Fig. 2
Efficiency vs. Output Current
20
30
40
50
60
70
80
90
100
0.1
1
10
100
Output Current (mA)
VIN = 4.2V
VIN = 3.6V
VIN = 2.7V
VFB vs. Ambient Temperature
244
246
248
250
252
254
256
-40
-20
0
2040
6080
Ambient Temperature (°C)


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