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參數(shù)資料
| 型號： | ISL6580CR-T |
| 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)： | 9/31頁 |
| 文件大?。?/td> | 1391K |
| 代理商： | ISL6580CR-T |
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9
Multi-Phase Power Conversion
Microprocessor load current profiles have changed to the
point where the multi-phase power conversion advantage is
pronounced. The technical challenges associated with
producing a single-phase converter which is both cost-
effective and thermally viable have forced a change to the
cost-saving approach of multi-phase. The ISL6590 controller
and ISL6580 Power Stages help reduce the complexity of
implementation by integrating vital functions and requiring
minimal output components. The
Typical Application
Drawing
provides a top level view of multi-phase power
conversion using the ISL6590 and ISL6580. The
Typical
Application Drawing
and the waveforms below describe a 3
phase converter. The ISL6590 can control up to 6
interleaved phases.
Interleaving
The switching of each channel in a multi-phase converter is
timed to be symmetrically out of phase with each of the other
channels. In a 3-phase converter, each channel switches 1/3
cycle after the previous channel and 1/3 cycle before the
following channel. As a result, the three-phase converter has
a combined ripple frequency three times greater than the
ripple frequency of any one phase. In addition, the peak-to-
peak amplitude of the combined inductor currents is reduced
in proportion to the number of phases (Equations 1 and 2).
Increased ripple frequency and lower ripple amplitude mean
that the designer can use less per-channel inductance and
lower total output capacitance for any performance
specification.
Figure 1 illustrates the multiplicative effect on output ripple
frequency. The three channel currents (IL1, IL2, and IL3),
combine to form the AC ripple current and the DC load
current. The ripple component has three times the ripple
frequency of each individual channel current. The peak-to-
peak current waveforms for each phase is about 7A, and the
dc components of the inductor currents combine to feed the
load.
ATRH (ACTIVE TRANSIENT RESPONSE HIGH)
Step
ATRH Step
-7.5
mV
Range
ATRH adjustment Range
-233
0
mV
Default
Address Register Default
-67.5
mV
ATRL (ACTIVE TRANSIENT RESPONSE LOW)
Step
ATRL Step
7.5
mV
Range
ATRL adjustment Range
0
233
mV
Default
ATRL Default
75
mV
VID STEP
Step
VID Step
12.5
mV
Range
VID Range
.8325
1.6
V
Electrical Specifications
V
DD
= 3.3VDC, V
CC
= 12VDC, V
DRIVE
= 5VDC, V
REF
= 2.5V, SYSCLK = 133.33MHz, SCLK = 16.67MHz,
T
A
= 25°C Unless Otherwise Specified
(Continued)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
FIGURE 1. PWM AND INDUCTOR-CURRENT WAVEFORMS
FOR 3-PHASE CONVERTER
1
μ
s/DIV
PWM2, 5V/DIV
PWM1, 5V/DIV
IL2, 7A/DIV
IL1, 7A/DIV
IL1 + IL2 + IL3, 7A/DIV
IL3, 7A/DIV
PWM3, 5V/DIV
ISL6580
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