ISL68137_16 Datasheet, PDF (20/53 Pages) Intersil Corporation – Digital Dual Output, 7-Phase Configurable PWM

ISL68137
Smart Power Stage OC Fault Detect
Intersil Smart Power Stage (SPS) devices will output a large
signal on their IMON lines if peak current exceeds their
preprogrammed threshold. (For more detail about this
functionality, please refer to the relevant SPS datasheet.) The
ISL68137 is equipped to detect this fault flag and immediately
shut down. This detector is enabled on the GUI Overcurrent Fault
setup screen.
This feature functions by detecting signals which exceed the
current sense ADC full-scale range. If this detector is disabled
while using an Intersil SPS, the SPS Fault# signal must be
connected to the controller Enable pin of the associated rail. This
will ensure that an SPS OC event will be detected and the
converter will shut down.
Thermal Monitoring and Protection
The TWARN pin indicates the temperature status of the voltage
regulator. The TWARN pin is an open-drain output and an
external pull-up resistor is required. This signal is valid only after
the controller is enabled.
The TWARN signal can be used to inform the system that the
temperature of the voltage regulator is too high and the load
should reduce its power consumption. TWARN only indicates a
thermal warning, not a fault.
The thermal monitoring function block diagram is shown in
Figure 24. The ISL68137 has 2 over-temperature thresholds,
which allow both warning and fault indications. Each
temperature sensor threshold can be independently
programmed in the PowerNavigator™ GUI. Figure 25 on page 20
shows the thermal warning to TWARN and Figure 26 on page 20
shows the over-temperature fault to shutdown. PGOOD and
TWARN can be configured to indicate these warning and fault
thresholds via the PowerNavigator™ GUI.
TEMP
SENSORS
TELEMETRY
CONTROL
IC
TMAX
HIGH OT THRESHOLD
LOW OT THRESHOLD
PWM
PGOOD
TWARN
FIGURE 25. THERMAL WARNING TO TWARN
HIGH OT THRESHOLD
LOW OT THRESHOLD
PWM
PGOOD
TWARN
FIGURE 26. OVER-TEMPERATURE FAULT
TMONx
VCCS
DELTA
VBE
ADC
TEMP
MONITOR
TWARN
FIGURE 24. BLOCK DIAGRAM OF THERMAL MONITORING
FUNCTION
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September 27, 2016