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ISL6334D Datasheet(PDF) 20 Page - Renesas Technology Corp

Part # ISL6334D
Description  VR11.1, 4-Phase PWM Controller with Phase Dropping, Droop Disabled and LoadCurrent Monitoring Features
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

ISL6334D Datasheet(HTML) 20 Page - Renesas Technology Corp

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ISL6334D
FN6802 Rev 4.00
Page 20 of 28
Apr 29, 2016
Overcurrent Protection
The ISL6334D has two levels of overcurrent protection. Each
phase is protected from a sustained overcurrent condition by
limiting its peak current, while the combined phase currents are
protected on an instantaneous basis.
In instantaneous protection mode, ISL6334D utilizes the sensed
average current IAVG to detect an overcurrent condition. See
“Current Sensing” on page 13 for more details on how the
average current is measured. The average current is continually
compared with a constant 105µA reference current, as shown in
Figure 13. Once the average current exceeds the reference
current, a comparator triggers the converter to shutdown.
The current out of the IMON pin is equal to the sensed average
current IAVG. With a resistor from IMON to GND, the voltage at
IMON will be proportional to the sensed average current and the
resistor value. The ISL6334D continuously monitors the voltage
at IMON pin. If the voltage at IMON pin is higher than 1.11V, a
comparator triggers the overcurrent shutdown. By increasing the
resistor between IMON and GND, the overcurrent protection
threshold can be adjusted to be less than 105µA. For example,
the overcurrent threshold for the sensed average current IAVG
can be set to 95µA by using a 11.8kΩ resistor from IMON to GND.
At the beginning of overcurrent shutdown, the controller places
all PWM signals in a high-impedance state within 20ns,
commanding the Intersil MOSFET driver ICs to turn off both upper
and lower MOSFETs. The system remains in this state a period of
4096 switching cycles. If the controller is still enabled at the end
of this wait period, it will attempt a soft-start. If the fault remains,
the trip-retry cycles will continue indefinitely (as shown in
Figure 14) until either controller is disabled or the fault is
cleared. Note that the energy delivered during trip-retry cycling is
much less than during full-load operation, so there is no thermal
hazard during this kind of operation.
For the individual channel overcurrent protection, ISL6334D
continuously compares the sensed current signal of each
channel with the 129µA reference current. If one channel current
exceeds the reference current, ISL6334D will pull the PWM
signal of this channel to low for the rest of the switching cycle.
This PWM signal can be turned on next cycle if the sensed
channel current is less than the 129µA reference current. The
peak current limit of individual channel will not trigger the
converter to shutdown.
Thermal Monitoring
(VR_HOT/VR_FAN)
There are two thermal signals to indicate the temperature status
of the voltage regulator: VR_HOT and VR_FAN. Both VR_FAN and
VR_HOT pins are open-drain outputs, and external pull-up
resistors are required. Those signals are valid only after the
controller is enabled.
The VR_FAN signal indicates that the temperature of the voltage
regulator is high and more cooling airflow is needed. The VR_HOT
signal can be used to inform the system that the temperature of
the voltage regulator is too high and the CPU should reduce its
power consumption. The VR_HOT signal may be tied to the CPU’s
PROC_HOT signal.
The diagram of thermal monitoring function block is shown in
Figure 15 on page 21. One NTC resistor should be placed close to
the power stage of the voltage regulator to sense the operational
temperature, and one pull-up resistor is needed to form the
voltage divider for the TM pin. As the temperature of the power
stage increases, the resistance of the NTC will reduce, resulting
in the reduced voltage at the TM pin. Figure 16 on page 21 shows
the TM voltage over the temperature for a typical design with a
recommended 6.8kΩ NTC (P/N: NTHS0805N02N6801 from
Vishay) and 1kΩ resistor RTM1. We recommend using those
resistors for accurate temperature compensation.
There are two comparators with hysteresis to compare the TM
pin voltage to the fixed thresholds for VR_FAN and VR_HOT
signals respectively. The VR_FAN signal is set to high when the
TM voltage is lower than 39.1% of VCC voltage, and is pulled to
GND when the TM voltage increases to above 45.1% of VCC
FIGURE 13. VR_RDY AND PROTECTION CIRCUITRY
-
+
VID + 0.175V
VDIFF
-
+
105µA
IAVG
DAC
OV
OC
UV
VR_RDY
50%
SOFT-START, FAULT
AND CONTROL LOGIC
-
+
OC
IMON
1.11V
0A
0V
2ms/DIV
OUTPUT CURRENT
FIGURE 14. OVERCURRENT BEHAVIOR IN HICCUP MODE
fSW = 500kHz
OUTPUT VOLTAGE


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