ISL6445 Datasheet, PDF (7/15 Pages) Intersil Corporation – 1.4MHz Dual, 180 Out-of-Phase, Step-Down PWM Controller

ISL6445
Typical Performance Curves Oscilloscope plots are taken using the ISL6445EVAL Evaluation Board.
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 (1.2V)
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 (3.3V), V_IN = 5V
7
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 (3.3V), V_IN = 5V
FN9230.1
June 3, 2008