ISL6580CR Intersil, ISL6580CR Datasheet - Page 18

• Manufacturer Part Number: ISL6580CR
• Description: IC DRIVER HIGH SIDE FET 56-QFN
• Manufacturer: Intersil
• Type: High Side/Low Side Driverr

Specifications of ISL6580CR

• Input Type: Non-Inverting
• Number Of Outputs: 12
• On-state Resistance: 20 mOhm
• Current - Output / Channel: 25A
• Current - Peak Output: 35A
• Voltage - Supply: 5 V ~ 12 V
• Operating Temperature: 0°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 56-VQFN
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

FIGURE 24. COMBINATION OF SYNCHRONOUS (NFET AND
FIGURE 25. SAMPLE OUTPUT VOLTAGE TRANSIENT
ATRL
ATRL
ATRL
ATRH
ATRH
ATRH
NFET
NFET
NFET
NFET
NFET
NFET
PFET
PFET
PFET
PFET
PFET
PFET
NDRIVE
NDRIVE
NDRIVE
NDRIVE
NDRIVE
NDRIVE
PWM
PWM
PWM
PWM
PWM
PWM
PFET) AND ASYNCHRONOUS (ATRL AND ATRH)
SIGNALS TO GENERATE EFFECTIVE CONTROL
SIGNALS (NDRIVE AND PWM) TO ISL6580’S
RESPONSE WITHOUT & WITH ATR ENGAGED
i
i
i
i+1
i+1
i+1
i
i
i
i+1
i+1
i+1
i
i
i
i+1
i+1
i+1
i
i
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i+1
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i+1
18
ISL6580
ATR Threshold Definition
The ATRL and ATRH transient voltage thresholds are set
with the user interface software and written to the dedicated
ISL6580. The voltage offsets are programmed digitally in
7.5mV increments. The ATRL and ATRH offsets may be
specified independently.
ATR and VID Stepping
The reference voltage (PVID) used for ATR sensing is
updated synchronously with VID stepping. Therefore, the
ATR transient voltage thresholds programmed by the user
track VID automatically.
ATR Connections
The dedicated ISL6580 requires that the VRM sense leads
be connected to its vsense+ and vsense– inputs. This
sensed output voltage is compared against PVID and used
to generate ATRL and ATRH as necessary. It is highly
recommended that both PCB traces be routed as a minimal
length pair to minimize differential and common-mode noise
pickup. A single-pole low-pass filter at the vsense+ and
vsense– inputs is also recommended to further suppress
high-frequency pickup noise.
The ATRL and ATRH outputs of the dedicated ISL6580 must
be connected to the ATRL and ATRH inputs of the ISL6590.
It is highly recommended that both PCB traces be routed as
a pair to minimize skew and common-mode noise.
Protection Features
The ISL6580 / ISL6590 have several protection features that
shut down the converter to prevent catastrophic and
cascade system failures. Output voltages, currents and
temperatures are monitored and compared to limits that are
set by the designer (with the user interface software). Input
Under Voltage (IUVP), Output Under Voltage (OUVP),
Output Over Voltage (OOVP) and Over Temperature Sense
are detected by each ISL6580. If any of the fault limits are
exceeded a fault bit is set in the ISL6580’s fault register. The
ISL6590 controller polls the fault register continuously via the
Back Side Bus. If any of the fault bits are set the converter
shuts down. the user interface software reads the fault
registers and indicates which type of fault caused the shut
down (in the Controls and Interface window). Input power
must be cycled off to reset most faults. IUVP is reset by
cycling the OUT_EN line. The ISL6590 controller shuts the
converter down by setting all PWMs and NDRIVEs signals to
ground and switching all MOSFETs OFF.
Over Current Protection
Over Current is handled in two ways. One is Peak Current
Limiting (‘pulse by pulse’ current limiting). If the ISL6580
senses current above the Peak Current limit set with the user
interface software, it turns the upper MOSFET off for the
remainder of one switching period. This does not shut down
the converter.