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參數(shù)資料
| 型號： | ISL6568CRZ-T |
| 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, LEAD FREE, PLASTIC, MO-220-VHHD, MLPL, QFN-32 |
| 文件頁數(shù)： | 15/28頁 |
| 文件大?。?/td> | 716K |
| 代理商： | ISL6568CRZ-T |
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15
FN9187.3
July 25, 2005
Once the desired output offset voltage has been determined,
use the following formulas to set R
OFS
:
For Positive Offset (connect R
OFS
to GND):
×
OFFSET
For Negative Offset (connect R
OFS
to VCC):
Dynamic VID
Modern microprocessors need to make changes to their core
voltage as part of normal operation. They direct the core-
voltage regulator to do this by making changes to the VID
inputs. The core-voltage regulator is required to monitor the
DAC inputs and respond to on-the-fly VID changes in a
controlled manner, supervising a safe output voltage transition
without discontinuity or disruption.
The DAC mode the ISL6568 is operating in determines how
the controller responds to a dynamic VID change. When in
VRM10 mode the ISL6568 checks the VID inputs six times
every switching cycle. If a new code is established and it
stays the same for 3 consecutive readings, the ISL6568
recognizes the change and increments the reference.
Specific to VRM10, the processor controls the VID
transitions and is responsible for incrementing or
decrementing one VID step at a time. In VRM10 setting, the
ISL6568 will immediately change the reference to the new
requested value as soon as the request is validated; in
cases where the reference step is too large, the sudden
change can trigger overcurrent or overvoltage events.
In order to ensure the smooth transition of output voltage
during a VRM10 VID change, a VID step change smoothing
network is required for an ISL6568 based voltage regulator.
This network is composed of a 1k
internal resistor between
the output of DAC and the capacitor C
REF
, between the REF
pin and ground. The selection of C
REF
is based on the time
duration for 1 bit VID change and the allowable delay time.
Assuming the microprocessor controls the VID change at 1
bit every T
VID
, the relationship between C
REF
and T
VID
is
given by Equation 10.
As an example, for a VID step change rate of 5
μ
s per bit, the
value of C
REF
is 22nF based on Equation 10.
When running in VRM9 or AMD Hammer operation, the
ISL6568 responds slightly differently to a dynamic VID change
than when in VRM10 mode. In these modes the VID code can
be changed by more than a 1-bit step at a time. Once the
controller receives the new VID code it waits half of a phase
cycle and then begins slewing the DAC 12.5mV every phase
cycle, until the VID and DAC are equal. Thus, the total time
required for a VID change, t
DVID
, is dependent on the switching
frequency (f
S
), the size of the change (
V
VID
), and the time
required to register the VID change. The one-cycle addition in
the t
DVID
equation is due to the possibility that the VID code
change may occur up to one full switching cycle before being
recognized. The approximate time required for a ISL6568-
based converter in AMD Hammer configuration running at f
S
=
E/A
FB
OFS
VCC
GND
+
-
+
-
0.5V
1.5V
GND
R
OFS
R
FB
VDIFF
ISL6568
FIGURE 8. POSITIVE OFFSET OUTPUT VOLTAGE
PROGRAMMING
VREF
V
OFS
-
+
I
OFS
E/A
FB
OFS
VCC
GND
+
-
+
-
0.5V
1.5V
VCC
R
OFS
R
FB
VDIFF
ISL6568
FIGURE 9. NEGATIVE OFFSET OUTPUT VOLTAGE
PROGRAMMING
VREF
V
OFS
+
-
I
OFS
(EQ. 8)
R
OFS
0.5
--------------------------
R
=
(EQ. 9)
R
OFS
1.5
OFFSET
R
×
--------------------------
=
C
REF
0.004X T
VID
=
(EQ. 10)
ISL6568
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| ISL6568CRZ-TKR5184 | 功能描述:IC CTRLR PWM 2PHASE BUCK 32-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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| ISL6568IRZ | 功能描述:IC CTRLR PWM BUCK 2PHASE 32-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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