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ACT4082AUS-T

16V, 1.2A, 1.4MHz Step-Down DC/DC Converter in SOT23-6

Active-Semi, Inc 

Active-Semi

ACT4082A

Rev0, 16-May-08

TYPICAL PERFORMANCE CHARACTERISTICS CONT’D

(Circuit of Figure 2, VIN = 12V, L = 4.7µH, C1 = 10µF, C2 = 22µF, TA = +25°C, unless otherwise specified.)

Load Transient Response

ILOAD = 200mA to 800mA

CH1

Load Transient Response

ILOAD = 200mA to 1.2A

CH1

CH2

CH1: VOUT, 50mV/div

CH2: ILOAD, 500mA/div

TIME: 100µs/div

Start-up Waveforms

ILOAD = 0mA

CH1

CH2

CH3

CH1: VOUT, 2V/div

CH2: VSW, 10V/div

CH3: IL, 1A/div

TIME: 200µs/div

Steady State Switching Waveforms

CH1

ILOAD = 1A

CH2

CH3

CH1: VOUT, 50mV/div, (AC COUPLED)

CH2: VSW, 10V/div

CH3: IL, 500mA/div

TIME: 400ns/div

CH2

CH1: VOUT, 50mV/div

CH2: ILOAD, 500mA/div

TIME: 100µs/div

Start-up Waveforms

ILOAD = 1A

CH1

CH2

CH3

CH4

CH1: VEN, 2V/div

CH2: VOUT, 2V/div

CH3: VSW, 10V/div

CH4: IL, 1A/div

TIME: 400µs/div

Hiccup Mode Switching Waveforms

CH1

CH2

CH1: VOUT, 100mV/div, (AC COUPLED)

CH2: IL, 1A/div

TIME: 1ms/div

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