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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)： | 17/28頁 |
| 文件大?。?/td> | 784K |
| 代理商： | ISL6566A |
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17
FN9200.2
July 27, 2005
Hysteresis between the rising and falling thresholds
assure that once enabled, the ISL6566A will not
inadvertently turn off unless the PVCC bias voltage drops
substantially (see
Electrical Specifications
).
5. The VID code must not be 111111 or 111110 in VRM10
mode or 11111 in AMD Hammer or VRM9 modes. These
codes signal the controller that no load is present. The
controller will enter shut-down mode after receiving either
of these codes and will execute soft-start upon receiving
any other code. These codes can be used to enable or
disable the controller but it is not recommended. After
receiving one of these codes, the controller executes a
2-cycle delay before changing the overvoltage trip level to
the shut-down level and disabling PWM. Overvoltage
shutdown cannot be reset using one of these codes.
When each of these conditions is true, the controller
immediately begins the soft-start sequence.
Soft-Start
The soft-start function allows the converter to bring up the
output voltage in a controlled fashion, resulting in a linear
ramp-up. Following a delay of 16 PHASE clock cycles
between enabling the chip and the start of the ramp, the
output voltage progresses at a fixed rate of 12.5mV per each
16 PHASE clock cycles.
Thus, the soft-start period (not including the 16 PHASE clock
cycle delay) up to a given voltage, V
DAC
, can be
approximated by the following equation
where V
DAC
is the DAC-set VID voltage, and f
S
is the
switching frequency.
The ISL6566A also has the ability to start up into a pre-
charged output, without causing any unnecessary
disturbance. The FB pin is monitored during soft-start, and
should it be higher than the equivalent internal ramping
reference voltage, the output drives hold both MOSFETs off.
Once the internal ramping reference exceeds the FB pin
potential, the output drives are enabled, allowing the output
to ramp from the pre-charged level to the final level dictated
by the DAC setting. Should the output be pre-charged to a
level exceeding the DAC setting, the output drives are
enabled at the end of the soft-start period, leading to an
abrupt correction in the output voltage down to the DAC-set
level.
T
SS
V
1280
S
---------------------------------
=
(EQ. 13)
FIGURE 12. SOFT-START WAVEFORMS FOR ISL6566A-
BASED MULTI-PHASE CONVERTER
ENLL (5V/DIV)
V
OUT
(0.5V/DIV)
GND>
T1
GND>
T2
T3
OUTPUT PRECHARGED
BELOW DAC LEVEL
OUTPUT PRECHARGED
ABOVE DAC LEVEL
FIGURE 13. POWER GOOD AND PROTECTION CIRCUITRY
-
+
VID + 150mV
VSEN
-
+
0.82 x DAC
OV
UV
PGOOD
SOFT-START, FAULT
AND CONTROL LOGIC
-
+
OC
-
+
ISEN
IREF
ISUM
ICOMP
OCSET
R
OCSET
+
-
V
DROOP
V
OCSET
+
-
V
OVP
100uA
ISL6566A INTERNAL CIRCUITRY
-
+
RGND
x1
-
+
+1V
VDIFF
ISL6566A
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| ISL6566ACRZ | 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 |
| ISL6566ACRZ-T | 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 |
| 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 |
| ISL6566AIRZ-T | 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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