ISL6441 Datasheet, PDF (9/18 Pages) Intersil Corporation – 1.4MHz Dual, 180 Out-of-Phase, Step-Down PWM and Single Linear Controller

ISL6441
Typical Performance Curves Oscilloscope plots are taken using the ISL6441AEVAL Evaluation Board, V_IN = 12V, Unless
Otherwise Noted. (Continued)
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 1V/DIV
FIGURE 9. PWM SOFT-START WAVEFORM
100
90
80
70
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
LOAD CURRENT (A)
FIGURE 11. PWM1 EFFICIENCY vs LOAD, V_IN = 5V,
V_OUT = 3.3V
9
V_OUT1 2V/DIV
I_L1 2A/DIV
SS1 2V/DIV
FIGURE 10. OVERCURRENT HICCUP MODE OPERATION
100
90
80
70
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
LOAD CURRENT (A)
FIGURE 12. PWM2 EFFICIENCY vs LOAD, V_IN = 5V,
V_OUT = 3.3V
FN9197.3
May 26, 2009