ISL78227 Datasheet, PDF (12/43 Pages) Intersil Corporation – 2-Phase Boost Controller with Integrated Drivers

ISL78227
Electrical Specifications Refer to Figure 3 on page 7 and Typical Application Schematics (page 8). Operating conditions unless
otherwise noted: V_IN = 12V, V_PVCC = 5.2V and V_VCC = 5.2V, T_A = -40°C to +125°C (Note 7). Typicals are at T_A = +25°C. Boldface limits apply across
the operating temperature range, -40°C to +125°C. (Continued)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
MAX
(Note 6) TYP (Note 6) UNIT
CURRENT SENSE AMPLIFIER
Minimum ISENxN and ISENxP Common-Mode
Voltage Range
Accuracy becomes worse when lower than
4
V
4V
Maximum ISENxN and ISENxP Common-Mode
Voltage Range
55
V
Maximum Input Differential Voltage Range
VISENxP -
VISENxN
±0.3
V
ISENxP/ISENxN Bias Current
ZCD DETECTION - CSA
I_{SENxP/N_BIAS} Sourcing out of pin, EN = 5V,
V_ISENxN = V_ISENxP, V_CM = 4V to 55V
100
123
150 µA
Zero Crossing Detection (ZCD) Threshold
V_{ZCD_CSA}
Measures voltage threshold before R_SEN at -4.0
1.3
6.0 mV
CSA inputs (equivalent to the voltage across
the current sense shunt resistor),
R_SET = 665Ω (0.1%)
PHASE DROPPING
V_IMON Phase-Drop Falling Threshold, to Drop V_{PHDRP_TH_F} When V_IMON falls below V_{PHDRP_TH_F}, drop 1.0
1.1
1.2
V
Phase 2
off Phase 2
V_IMON Phase-Add Rising Threshold, to Add
Phase 2
V_{PHADD_TH_R} When V_IMON rise above V_{PHADD_TH_R}, add
back Phase 2
1.05
1.15
1.25 V
V_IMON Phase-Drop Threshold Hysteresis
V_{PHDRP_HYS} When V_IMON<V_{PHDRP_TH_F} - V_{PHDrop_HYS},
45
50
55 mV
Add back Phase 2
PEAK OVERCURRENT CYCLE-BY-CYCLE LIMITNG (OC1)
Peak Current Cycle-by-Cycle Limit Threshold for
V_OC1
Cycle-by-cycle current limit threshold
40
53
65 mV
Individual Phase
(I_{OC1_TH} = 80µA, compared with I_SENx).
Measures the voltage threshold before R_SETx
at CSA Inputs (equivalent to the voltage
across the current sense shunt resistor),
R_SETx = 665Ω (0.1%)
Peak Current Cycle-by-Cycle Limit Trip Delay
C_LG = OPEN, from the time V_OC1 tripped to
50
ns
LG falling.
PEAK OVERCURRENT FAULT PROTECTION OC2_PEAK, (Refer to “Peak Overcurrent Fault (OC2_PEAK) Protection” on page 35 for details)
Peak Current Fault Protection Threshold for
Individual Phase
OC2_PEAK Trip Blanking Time
V_OC2
Peak current hiccup protection threshold
55
70
85 mV
(I_{OC2_TH} = 105µA, compared with I_SENx).
Measures the voltage threshold before R_SETx
at CSA Inputs (equivalent to the voltage
across the current sense shunt resistor),
R_SETx = 665Ω (0.1%)
3
cycles
NEGATIVE CURRENT CYCLE-BY-CYCLE LIMITNG (OC_NEG)
Negative Current Cycle-by-Cycle Limit
V_{OC_NEG} Negative Current Cycle-by-Cycle Limit
-32
mV
Threshold for Individual Phase
(I_{OC_NEG_TH} = -48µA, compared with I_SENx).
Measures the voltage threshold before R_SETx
at CSA Inputs (equivalent to the voltage
across the current sense shunt resistor),
R_SET = 665Ω (0.1%)
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FN8808.2
February 24, 2016