ISL78229 Datasheet, PDF (19/71 Pages) Intersil Corporation – 2-Phase Boost Controller with Drivers

ISL78229
Performance Curves Unless otherwise specified, operating conditions for the oscilloscope waveforms are V_IN = 12V,
V_OUT = 36V and T_A = +25°C. (Continued)
FB 300mV/DIV
V_OUT 6.8V/DIV
FB 300mV/DIV
V_OUT 6.8V/DIV
TRACK 300mV/DIV
TRACK 300mV/DIV
PH1 20.0V/DIV
PH1 20.0V/DIV
2ms/DIV
FIGURE 23. ANALOG TRACKING 100Hz SINUSOIDAL SIGNAL, CCM
MODE (DE/PHDRP = GND), ATRK/DTRAK = VCC,
I_OUT = 1A
2ms/DIV
FIGURE 24. ANALOG TRACKING 300Hz SINUSOIDAL SIGNAL AT THE
TRACK PIN, CCM MODE (DE/PHDRP = GND),
ATRK/DTRAK = VCC, I_OUT = 1A
IMON 500mV/DIV
I_IN 16A/DIV
PH1 30.0V/DIV
V_OUT 30.0V/DIV
50µs/DIV
FIGURE 25. STEADY-STATE OPERATION OF INPUT CONSTANT
CURRENT MODE, I_IN CONTROLLED AT 43A CONSTANT,
V_OUT = 19.5V
IMON 500mV/DIV
I_IN 16A/DIV
PH1 30.0V/DIV
V_OUT 30.0V/DIV
1s/DIV
FIGURE 27. LOAD CURRENT KEEP INCREASING FROM NO LOAD TO
OVERLOAD (25A), V_OUT STARTS TO DROP WHEN INPUT
CONSTANT CURRENT MODE STARTS TO WORK, INPUT
CURRENT IS FINALLY CONTROLLED TO BE CONSTANT
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TRACK 4.0V/DIV
V_OUT 7.0V/DIV
PH2 40.0V/DIV
PH1 40.0V/DIV
1µs/DIV
FIGURE 26. DIGITAL TRACKING (TRACKING SIGNAL,
FREQUENCY = 400kHz, D = 0.5, V_OUT = 28.3V
TRACK 4.0V/DIV
V_OUT 7.0V/DIV
PH2 40.0V/DIV
PH1 40.0V/DIV
1µs/DIV
FIGURE 28. DIGITAL TRACKING (TRACKING SIGNAL,
FREQUENCY = 400kHz, D = 0.3), V_OUT = 17V
FN8656.3
February 12, 2016