参数资料
型号: ISL6568IRZ-TR5184
厂商: Intersil
文件页数: 14/30页
文件大小: 0K
描述: IC CTRLR PWM 2PHASE BUCK 32-QFN
标准包装: 6,000
应用: 控制器,Intel VRM9,VRM10,AMD Hammer 应用
输入电压: 3 V ~ 12 V
输出数: 1
输出电压: 0.84 V ~ 1.6 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 32-VFQFN 裸露焊盘
供应商设备封装: 32-QFN(5x5)
包装: 带卷 (TR)
ISL6568
TABLE 4. VRM10 VOLTAGE IDENTIFICATION CODES (Continued)
EXTERNAL CIRCUIT
ISL6568 INTERNAL CIRCUIT
VID4
VID3
VID2
VID1
VID0
VID12.5
VDAC
R C
C C
COMP
1
0
1
1
1
1
1.2750
1
1
0
0
1
1
1
1
1
0
0
1
1.2875
1.300
REF
VID DAC
1k
1
0
1
1
0
0
1.3125
C REF
+
1
0
1
0
1
1
1.3250
FB
-
V COMP
1
1
0
0
1
1
0
0
1
0
0
1
1.3375
1.3500
R FB
+
V OFS
-
VDIFF
ERROR AMPLIFIER
I OFS
1
0
1
0
0
0
1.3625
1
1
0
0
0
0
1
1
1
1
1
0
1.3750
1.3875
+
V OUT
-
VSEN
RGND
+
+
1
0
0
1
0
1
1.4000
1
1
1
0
0
0
0
0
0
1
0
0
0
1
1
0
1
0
1.4125
1.4250
1.4375
+
V DROOP
-
IREF
ICOMP
-
-
DIFFERENTIAL
REMOTE-SENSE
AMPLIFIER
1
0
0
0
0
1
1.4500
1
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
0
1
1
0
0
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
0
1
0
1
1.4625
1.4750
1.4875
1.5000
1.5125
1.5250
1.5375
1.5500
1.5625
1.5750
1.5875
1.6000
FIGURE 6. OUTPUT VOLTAGE AND LOAD-LINE REGULATION WITH
OFFSET ADJUSTMENT
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
Voltage Regulation
In order to regulate the output voltage to a specified level, the
ISL6568 uses the integrating compensation network shown in
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.
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.
14
V OUT = V REF – V OFS – V DROOP
(EQ. 4)
FN9187.5
January 12, 2012
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