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參數(shù)資料
| 型號： | ISL6580CR |
| 廠商： | INTERSIL CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Integrated Power Stage |
| 中文描述： | 35 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PQCC56 |
| 封裝： | 8 X 8 MM, PLASTIC, QFN-56 |
| 文件頁數(shù)： | 18/31頁 |
| 文件大?。?/td> | 1391K |
| 代理商： | ISL6580CR |
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18
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.
NFET
i
NFET
i
+1
PFET
i
+1
PFET
i
PWM
i
+1
PWM
i
NDRIVE
i
NDRIVE
i
+1
ATRL
ATRH
FIGURE 24. COMBINATION OF SYNCHRONOUS (NFET AND
PFET) AND ASYNCHRONOUS (ATRL AND ATRH)
SIGNALS TO GENERATE EFFECTIVE CONTROL
SIGNALS (NDRIVE AND PWM) TO ISL6580’S
FIGURE 25. SAMPLE OUTPUT VOLTAGE TRANSIENT
RESPONSE WITHOUT & WITH ATR ENGAGED
ISL6580
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| ISL6580CR-T | Integrated Power Stage |
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| ISL6590DR | Dual Low-Noise Wide-Bandwidth Precision Amplifier 8-PDIP -40 to 85 |
| ISL6592DNZ-T | FUSE, ANTISURGE 2A |
| ISL6592 | Dual Low-Noise Wide-Bandwidth Precision Amplifier 8-TSSOP -40 to 85 |
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