ACT4088
Rev 2, 15-Nov-12
TYPICAL PERFORMANCE CHARACTERISTICS CONT’D
(Circuit of Figure 2, V
IN
= 12V, L = 4.7µH, C1 = 10µF, C2 = 22µF, T
A
= +25°C, unless otherwise specified.)
Load Transient Response
ACT4088-007
I
LOAD
= 200mA to 800mA
Load Transient Response
ACT4088-008
I
LOAD
= 200mA to 1.5A
CH1
CH1
CH2
CH2
CH1: V
OUT
, 50mV/div
CH2: I
LOAD
, 500mA/div
TIME: 100µs/div
CH1: V
OUT
, 50mV/div
CH2: I
LOAD
, 500mA/div
TIME: 100µs/div
Start-up Waveforms
ACT4088-009
I
LOAD
= 0mA
CH1
I
LOAD
= 1A
CH1
CH2
Start-up Waveforms
ACT4088-010
CH2
CH3
CH4
CH3
CH1: V
OUT
, 2V/div
CH2: V
SW
, 10V/div
CH3: I
L
, 1A/div
TIME: 200µs/div
CH1: V
EN
, 2V/div
CH2: V
OUT
, 2V/div
CH3: V
SW
, 10V/div
CH4: I
L
, 1A/div
TIME: 400µs/div
Steady State Switching Waveforms
ACT4088-011
I
LOAD
= 1A
CH1
Hiccup Mode Switching Waveforms
ACT4088-012
CH1
CH2
CH2
CH3
CH1: V
OUT
, 50mV/div, (AC COUPLED)
CH2: V
SW
, 10V/div
CH3: I
L
, 500mA/div
TIME: 400ns/div
CH1: V
OUT
, 100mV/div, (AC COUPLED)
CH2: I
L
, 1A/div
TIME: 1ms/div
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TM
-5-
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