參數(shù)資料
型號(hào)： ISL6568CR
廠商： INTERSIL CORP
元件分類： 穩(wěn)壓器
英文描述： Two-Phase Buck PWM Controller with Integrated MOSFET Drivers for VRM9, VRM10, and AMD Hammer Applications
中文描述： SWITCHING CONTROLLER, 1500 kHz SWITCHING FREQ-MAX, PQCC32
封裝： 5 X 5 MM, PLASTIC, MO-220-VHHD, MLFP, QFN-32
文件頁數(shù)： 13/28頁
文件大?。?/td> 716K
代理商： ISL6568CR
13
FN9187.3
July 25, 2005
Voltage Regulation
In order to regulate the output voltage to a specified level,
the ISL6568 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 ISL6568 to include the combined tolerances of each of
these elements.
The ISL6568 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.
1
0
1
0
0
0
1.3625
1
0
0
1
1
1
1.3750
1
0
0
1
1
0
1.3875
1
0
0
1
0
1
1.4000
1
0
0
1
0
0
1.4125
1
0
0
0
1
1
1.4250
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
ISL6568 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)
ISL6568
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