ISL78226 Datasheet, PDF (69/94 Pages) Intersil Corporation – Cycle-by-cycle peak current limiting

ISL78226
Phase-6 PWM Operation Enable/Disable Control Bit (0xBC: Bit 5)
Disable (remove) Phase-6 PWM operation when desired.
BIT1
0
Enable PWM operation of Phase-6 (default)
1
Disable (remove) Phase-6
DESCRIPTION
V6/V12 Overvoltage/Undervoltage Detection Enable/Disable Control Bit (0xBC: Bit 7)
Selects to enable or disable the V6/V12 overvoltage and undervoltage detection.
BIT0
0
Enable V6/V12 OV/UV detection (default)
1
Disable V6/V12 OV/UV detection
DESCRIPTION
SERIOUS FAULT RESPONSE CONTROL REGISTER (0XBD)
Definition: Serious fault response control register
Data Length in Bytes: 1
Data Format: Bit Field
Typical: R/W
Protectable: Yes
Default Value: 00h
Units: N/A
REGISTER NAME
Format
Bit Position
Access
Function
SERIOUS FAULT RESPONSE CONTROL REGISTER (0XBD)
Bit Field
7
6
5
4
3
2
1
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Boost Mode Buck Mode
BAT48 Short BAT48 Short
to GND Fault to GND Fault
Response Response
Control
Control
Boost Mode
L/S FET
Short Fault
Response
Control
Buck Mode
L/S FET
Short Fault
Response
Control
Reserved
Buck Mode Boost Mode
BAT12 Short H/S FET
to GND Fault Short Fault
Response Response
Control
Control
Buck Mode
H/S FET
Short Fault
Response
Control
Default Value
0
0
0
0
0
0
0
0
NOTE: The ISL78226 detects potential serious fault conditions, such as external power MOSFET shorts, by monitoring the input/output voltages and
continuous overcurrent situations. If a potential serious fault has been detected, the ISL78226 stops the PWMx outputs, which stop the converter, pull
down the "XSYS_FAIL" pin, and turn off the system immediately by using the external shutdown circuit. Even with this fault detection, however, there will
be a delay of a few switching cycles as the fault conditions are being determined. Therefore, this function is recommended for use as a supplemental
fault detector rather than a primary fault detector.
Buck Mode High-Side MOSFET Short Fault Response Control Bit (0xBD: Bit 0)
Set the XSYS_FAIL function when detecting the potential short of H/S MOSFET in Buck mode operation.
BIT0
DESCRIPTION
0
Pull down XSYS_FAIL when the potential H/S MOSFET short is detected in Buck mode (default).
PWM switching will stop immediately and latched-off. To restart, toggle EN or PWM_EN.
1
Do not pull down XSYS_FAIL when the potential H/S MOSFET short is detected in Buck mode.
PWM switching shut off or keep running will depend on the related fault (OC2, BAT12 UV) response settings.
Boost Mode High-Side MOSFET Short Fault Response Control Bit (0xBD: Bit 1)
Set the XSYS_FAIL function when detecting the potential short of H/S MOSFET in Boost mode operation.
BIT0
DESCRIPTION
0
Pull down XSYS_FAIL when the potential H/S MOSFET short is detected in Boost mode (default).
PWM switching will stop immediately and latched-off. To restart, toggle EN or PWM_EN.
1
Do not pull down XSYS_FAIL when the potential H/S MOSFET short is detected in Buck mode.
PWM switching shut off or keep running will depend on the related fault (OC2, BAT48 UV, BAT12 OV) response settings.
Submit Document Feedback ₆₉
FN8887.0
November 7, 2016