ACT8740
Rev PrB, 25-Feb-08
WLED BIAS DC/DC CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS
(ACT8740QLEHA, VVSYS = 3.6V, L = 22µH, COUT = 2.2µF, TA = 25°C, unless otherwise specified.)
REG2 RDSON
REG2 Efficiency vs. Output Current
900
800
100
90
4 LEDs
6 LEDs
700
600
500
400
300
200
80
70
60
50
2.5
3.0
3.5
4.0
4.5
5.0
5.5
1
5
9
13
17
21
25
31
VSYS Voltage (V)
Output Current (mA)
REG2 Over-Voltage Protection
REG2 Startup Waveform
CH1
CH2
CH1
0V
REG2/ON[ ] = 1
REG2/ON[ ] = 0
0V
CH1: VOUT3, 10V/div
CH2: VFB3, 200mV/div
TIME: 2ms/div
CH1: VOUT2, 10V/div
TIME: 100µs/div
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