PAM2805 Datasheet, PDF (4/9 Pages) Power Analog Micoelectronics – 3-Modes/3W WLED Driver with 1 or 2 Cell Battery

PAM2805
3-Modes/3W WLED Driver with 1 or 2 Cell Battery
Typical Performance Characteristics
T_A =25℃ , L=2.2uH , C_ΙΝ=10uF, C_ΟUT=10uF, C_BLK=1uF, unless otherwise noted.
1. LED Power Efficiency vs Input Voltage
100
90
80
70
60
50
40
30
20
10
0
3.1
2.8 2.5
2.2 1.9
ILED=350mA
ILED=750mA
1.6 1.3 1.0 0.7
Input Voltage(V)
2. LED Current vs Input Voltage
800
700
ILED=750mA( 100% brightnes s )
600
500
400
ILED=350mA( 100% brightnes s )
300
ILED=750mA(25% brightness )
200
100
ILED=350 mA(25% brightnes s )
0
3.1 2.8 2.5 2.2 1. 9 1.6 1.3 1.0 0. 7
Input Volt age(V)
3. DC Input Current vs Input Voltage
2 500
2 000
1 500
ILED=750mA( 100% brightness)
1 000
500
ILED=350mA(100% brightnes s)
0
3.4 3.1 2.8 2. 5 2.2 1.9 1.6 1.3 1. 0 0.7
Input Volt age(V)
4. Feedback Voltage vs Input Voltage
100
ILED=350mA( 100% brightness)
90
80
ILED=750mA(100% br ightnes s)
70
60
50
40
ILED=350mA (25% brightnes s)
30
20
ILED=750 mA( 25% br ightness )
10
0
3. 4 3.1 2.8 2. 5 2.2 1.9 1.6 1.3 1.0 0.7
Input Voltage(V)
Power Analog Microelectronics, Inc
www.poweranalog.com
4
11/2011 Rev1.0