ISL78227 Datasheet, PDF (16/43 Pages) Intersil Corporation – 2-Phase Boost Controller with Integrated Drivers

ISL78227
Performance Curves Unless otherwise specified, operating conditions for the oscilloscope waveforms are V_IN = 12V,
V_OUT = 36V and T_A = +25°C.
100
95
90
85
80
DE WITH PHASE DROP
75
70
DE WITHOUT PHASE DROP
65
60
CCM
55
50
0.01
0.10
1.00
10.00
NOTE: (See Typical ApplicatioLnOinADFigCuUrReR4EoNnTp(Aag) e 8.)
100.00
FIGURE 5. EFFICIENCY vs LOAD, 2-PHASE BOOST, 3 MODES
OPERATION, f_SW = 200kHz, V_IN = 12V, V_OUT = 36V,
T_A = +25°C
V_OUT 1.0V/DIV WITH 36V OFFSET
I_L1 5.0A/DIV
PH1 30.0V/DIV
SS 3.0V/DIV
10ms/DIV
FIGURE 6. EN INTO PREBIASED OUTPUT, CCM MODE
(DE/PHDRP = GND), I_OUT = 0A
PVCC 2.0V/DIV
PLLCOMP 500mV/DIV
SS 700mV/DIV
PH1 30.0V/DIV
500µs/DIV
FIGURE 7. EN ON AND INITIALIZATION TO START-UP, I_OUT = 0A
V_OUT 20.0V/DIV
PGOOD 5.0V/DIV
PH1 30.0V/DIV
SS 3.0V/DIV
20ms/DIV
FIGURE 8. SOFT-START, CCM MODE (DE/PHDRP = GND), I_OUT = 8A
SS 2.0V/DIV
PLLCOMP 500mV/DIV
CLKOUT 5.0V/DIV
PVCC 2.0V/DIV
200µs/DIV
FIGURE 9. EN ON AND INITIALIZATION TO START-UP, I_OUT = 0A
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V_OUT 20.0V/DIV
PGOOD 5.0V/DIV
PH1 30.0V/DIV
SS 3.0V/DIV
5ms/DIV
FIGURE 10. SOFT-START, DE+PHDROP MODE (DE/PHDRP = FLOAT),
I_OUT = 8A
FN8808.2
February 24, 2016