ACT6330
WLED BIAS DC/DC CONVERTER (REG1)
TYPICAL PERFORMANCE CHARACTERISTICS
(ACT6330QK, V
IN
= 3.6V, L = 22µH, C
IN
= 2.2µF, C
OUT
= 2.2µF, T
A
= 25°C, unless otherwise specified.)
Rev0, 02-Apr-08
REG1 Efficiency vs. Output Current
Normalized Output Current (%)
100
4 LEDs
90
100
90
80
70
60
50
40
30
20
10
0
0
ACT6330-001
PWM Output Current Adjustment
ACT6330-002
ON1 PWM Frequency = 1kHz
Efficiency (%)
6 LEDs
80
70
60
50
1
5
9
13
17
21
25
31
10
20
30
40
50
60
70
80
90
100
Output Current (mA)
ON1 Duty Cycle (%)
REG1 R
DSON
900
800
700
ACT6330-003
REG1 Over-Voltage Protection
ACT6330-004
CH1
R
DSON
(mΩ)
600
500
400
300
200
2.5
3.0
3.5
4.0
4.5
5.0
5.5
CH1: V
OUT1
, 10V/div
CH2: V
FB1
, 200mV/div
TIME: 2ms/div
CH2
0V
IN Voltage (V)
REG1 Startup Waveform
ACT6330-005
CH1
0V
CH2
0V
CH1: V
OUT1
, 10V/div
CH2: V
ON1
, 1V/div
TIME: 100µs/div
Innovative Power
TM
ActivePMU
TM
-9-
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is a trademark of Active-Semi.
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