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ACT6330QK-T

Dual PWM Step-Up DC/DCs in TQFN33

Active-Semi, Inc 

ACT6330

Rev0, 02-Apr-08

WLED BIAS DC/DC CONVERTER (REG1)

TYPICAL PERFORMANCE CHARACTERISTICS

(ACT6330QK, VIN = 3.6V, L = 22µH, CIN = 2.2µF, COUT= 2.2µF, TA = 25°C, unless otherwise specified.)

REG1 Efficiency vs. Output Current

100

4 LEDs

90

6 LEDs

80

70

60

50

1

5

9

13 17 21 25

31

Output Current (mA)

PWM Output Current Adjustment

100

ON1 PWM Frequency = 1kHz

90

80

70

60

50

40

30

20

10

0

0 10 20 30 40 50 60 70 80 90 100

ON1 Duty Cycle (%)

REG1 RDSON

900

800

700

600

500

400

300

200

2.5

3.0

3.5

4.0 4.5

5.0

5.5

IN Voltage (V)

REG1 Over-Voltage Protection

CH1

CH2

0V

CH1: VOUT1, 10V/div

CH2: VFB1, 200mV/div

TIME: 2ms/div

REG1 Startup Waveform

CH1

0V

CH2

0V

CH1: VOUT1, 10V/div

CH2: VON1, 1V/div

TIME: 100µs/div

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