ISL6443A Datasheet, PDF (9/19 Pages) Intersil Corporation – 300kHz Dual, 180° Out-of-Phase, Step-Down PWM and Single Linear Controller

ISL6443A
Typical Performance Curves (Continued)
(Oscilloscope Plots are Taken Using the ISL6443A EVAL Evaluation Board, VIN = 12V Unless Otherwise Noted.)
V_OUT1 200mV/DIV
AC-COUPLED
V_OUT2 200mV/DIV
AC-COUPLED
I_OUT1 1A/DIV
FIGURE 7. LOAD TRANSIENT RESPONSE V_OUT1 (3.3V)
I_OUT2 1A/DIV
FIGURE 8. LOAD TRANSIENT RESPONSE V_OUT2 (3.3V)
VCC_5V 1V/DIV
V_OUT1 2V/DIV
V_OUT1 1V/DIV
FIGURE 9. PWM SOFT-START WAVEFORM
100
90
80
70
60
0
1
2
3
4
LOAD CURRENT (A)
FIGURE 11. PWM1 EFFICIENCY vs LOAD (3.3V), V_IN = 12V
9
I_L1 2A/DIV
SS1 2V/DIV
FIGURE 10. OVERCURRENT HICCUP MODE OPERATION
100
90
80
70
60
0
1
2
3
4
LOAD CURRENT (A)
FIGURE 12. PWM2 EFFICIENCY vs LOAD (3.3V), V_IN = 12V
FN6600.1
December 7, 2007