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參數(shù)資料
| 型號： | ISL6566A |
| 廠商： | Intersil Corporation |
| 英文描述： | Three-Phase Buck PWM Controller with Two Integrated MOSFET Drivers and One External Driver Signal |
| 中文描述： | 三相降壓PWM控制器，帶有兩個集成MOSFET驅(qū)動器和一個外部驅(qū)動器的信號 |
| 文件頁數(shù)： | 13/28頁 |
| 文件大?。?/td> | 784K |
| 代理商： | ISL6566A |
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13
FN9200.2
July 27, 2005
Voltage Regulation
In order to regulate the output voltage to a specified level,
the ISL6566A uses the integrating compensation network
shown in Figure 6. This compensation network insures that
the steady-state error in the output voltage is limited only to
the error in the reference voltage (output of the DAC) and
offset errors in the OFS current source, remote-sense and
error amplifiers. Intersil specifies the guaranteed tolerance of
the ISL6566A to include the combined tolerances of each of
these elements.
The ISL6566A incorporates an internal differential remote-
sense amplifier in the feedback path. The amplifier removes
the voltage error encountered when measuring the output
voltage relative to the controller ground reference point,
resulting in a more accurate means of sensing output
voltage. Connect the microprocessor sense pins to the non-
inverting input, VSEN, and inverting input, RGND, of the
remote-sense amplifier. The droop voltage, V
DROOP
, also
feeds into the remote-sense amplifier. The remote-sense
output, V
DIFF
, is therefore equal to the sum of the output
voltage, V
OUT
, and the droop voltage. V
DIFF
is connected to
the inverting input of the error amplifier through an external
resistor.
The output of the error amplifier, V
COMP
, is compared to the
sawtooth waveform to generate the PWM signals. The PWM
signals control the timing of the Internal MOSFET drivers
and regulate the converter output so that the voltage at FB is
equal to the voltage at REF. This will regulate the output
voltage to be equal to Equation 4. The internal and external
circuitry that controls voltage regulation is illustrated in
Figure 6.
Load-Line (Droop) Regulation
Some microprocessor manufacturers require a precisely-
controlled output impedance. This dependence of output
voltage on load current is often termed “droop” or “l(fā)oad line”
regulation.
As shown in Figure 6, a voltage, V
DROOP
, proportional to the
total current in all active channels, I
OUT
, feeds into the
differential remote-sense amplifier. The resulting voltage at
the output of the remote-sense amplifier is the sum of the
output voltage and the droop voltage. As Equation 4 shows,
feeding this voltage into the compensation network causes
the regulator to adjust the output voltage so that it’s equal to
the reference voltage minus the droop voltage.
The droop voltage, V
DROOP
, is created by sensing the
current through the output inductors. This is accomplished
by using a continuous DCR current sensing method.
Inductor windings have a characteristic distributed
resistance or DCR (Direct Current Resistance). For
simplicity, the inductor DCR is considered as a separate
lumped quantity, as shown in Figure 7. The channel current,
I
L
, flowing through the inductor, passes through the DCR.
Equation 5 shows the s-domain equivalent voltage, V
L
,
across the inductor.
The inductor DCR is important because the voltage dropped
across it is proportional to the channel current. By using a
simple R-C network and a current sense amplifier, as shown
1
0
0
0
1
0
1.4375
1
0
0
0
0
1
1.4500
1
0
0
0
0
0
1.4625
0
1
1
1
1
1
1.4750
0
1
1
1
1
0
1.4875
0
1
1
1
0
1
1.5000
0
1
1
1
0
0
1.5125
0
1
1
0
1
1
1.5250
0
1
1
0
1
0
1.5375
0
1
1
0
0
1
1.5500
0
1
1
0
0
0
1.5625
0
1
0
1
1
1
1.5750
0
1
0
1
1
0
1.5875
0
1
0
1
0
1
1.6000
TABLE 4. VRM10 VOLTAGE IDENTIFICATION CODES (Continued)
VID4
VID3
VID2
VID1
VID0
VID12.5
VDAC
FIGURE 6. OUTPUT VOLTAGE AND LOAD-LINE
REGULATION WITH OFFSET ADJUSTMENT
I
OFS
EXTERNAL CIRCUIT
R
C
C
C
ISL6566A INTERNAL CIRCUIT
COMP
R
FB
FB
VDIFF
VSEN
RGND
-
+
V
OFS
ERROR AMPLIFIER
-
+
+
DIFFERENTIAL
REMOTE-SENSE
AMPLIFIER
V
COMP
REF
C
REF
-
+
VID DAC
1k
IREF
ICOMP
-
+
V
DROOP
-
+
V
OUT
-
V
OUT
V
REF
V
OFS
–
V
DROOP
–
=
(EQ. 4)
V
L
s
( )
I
L
s L
DCR
+
(
)
=
(EQ. 5)
ISL6566A
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| ISL6566AIRZ | 功能描述:IC CTRLR PWM 3PHASE BUCK 40-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標準包裝:43 系列:- 應(yīng)用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件 |
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